Release 2 (9.2)
Part Number A96655-01
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| Oracle9i SQLJ Developer's Guide and Reference Release 2 (9.2) Part Number A96655-01 |
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Profiles and profile customization are introduced in "SQLJ Profiles (ISO Standard Code)". This appendix presents more technical detail and discusses customizer options and how to use customizers other than the default Oracle customizer.
There is also discussion of Oracle specialized customizers, particularly the SQLCheckerCustomizer for semantics-checking profiles, and the AuditorInstaller for installing "auditors" for debugging.
The following topics are covered:
SQLJ profiles contain information about your embedded SQL operations, with a separate profile being created for each connection context class that your application uses. Profiles are created during the SQLJ translator code generation phase and customized during the customization phase. Customization enables your application to use vendor-specific database features. Separating these vendor-specific operations into your profiles enables the rest of your generated code to remain generic.
Each profile contains a series of entries for the SQLJ statements that use the relevant connection context class, where each entry corresponds to one SQL operation in your application.
Profiles exist as serialized objects stored in resource files packaged with your application. Because of this, profiles can be loaded, read, and modified (added to or re-customized) at any time. When profiles are customized, information is only added, never removed. Multiple customizations can be made without losing preceding customizations, so that your application maintains the capability to run in multiple environments. This is known as binary portability.
For profiles to have binary portability, SQLJ industry-standard requirements have been met in the Oracle SQLJ implementation.
During code generation, the translator creates each profile as follows:
sqlj.runtime.profile.Profile class..ser file name extension.
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Note: Oracle SQLJ provides an option to have the translator automatically convert these |
As discussed in "Code Generation", profile file names for application Foo are of the form:
Foo_SJProfilen.ser
SQLJ generates Foo_SJProfile0.ser, Foo_SJProfile1.ser, and so on, as needed, depending on how many connection context classes you use in your code. Or, if the -ser2class option is enabled, then SQLJ generates Foo_SJProfile0.class, Foo_SJProfile1.class, and so on.
Each profile has a getConnectedProfile() method that is called during SQLJ runtime. This method returns something equivalent to a JDBC Connection object, but with added functionality. This is further discussed in "Functionality of a Customized Profile at Runtime".
Below is a sample SQLJ executable statement with the profile entry that would result. For simplicity, the profile entry is presented as plain text with irrelevant portions omitted.
Note that in the profile entry, the host variable is replaced by JDBC syntax (the question mark).
Presume the following declaration:
#sql iterator Iter (double sal, String ename);
And presume the following executable statements:
String empname = 'Smith'; Iter it; ... #sql it = { SELECT ename, sal FROM emp WHERE ename = :empname };
================================================================= ... #sql { SELECT ename, sal FROM emp WHERE ename = ? }; ... PREPARED_STATEMENT executed via EXECUTE_QUERY role is QUERY descriptor is null contains one parameter 1. mode: IN, java type: java.lang.String (java.lang.String), sql type: VARCHAR, name: ename, ... result set type is NAMED_RESULT result set name is Iter contains 2 result columns 1. mode: OUT, java type: double (double), sql type: DOUBLE, name: sal, ... 2. mode: OUT, java type: java.lang.String (java.lang.String), sql type: VARCHAR, name: ename, ... =================================================================
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Note: This profile entry is presented here as text for convenience only; profiles are not actually in text format. They can be printed as text, however, using the SQLJ |
By default, running the sqlj script on a SQLJ source file includes an automatic customization process, where each profile created during the code generation phase is customized for use with your particular database. The default customizer is the Oracle customizer, oracle.sqlj.runtime.OraCustomizer, which optimizes your profiles to use type extensions and performance enhancements specific to Oracle9i.
You can also run the sqlj script to customize profiles created previously. On the SQLJ command line, you can specify .ser files individually, .jar files containing .ser files, or both.
Regardless of whether you use the Oracle customizer or an alternative customizer, SQLJ uses a front-end customization utility known as the customizer harness in accomplishing your customizations.
When you run SQLJ, you can specify customization options for the customizer harness (for general customization settings that apply to any customizer you use) and for your customizer (for settings used by the particular customizer). In either case, you can specify these options either on the command line or in a properties file. This is discussed in "Customization Options and Choosing a Customizer".
A customizer is required to be a JavaBeans component adhering to the standard JavaBeans API to expose its properties, and must implement the sqlj.runtime.profile.util.ProfileCustomizer interface, which specifies a customize() method. For each profile to be customized, the customizer harness calls the customize() method of the customizer object.
The Oracle customizer meets the preceding requirements and is defined in the oracle.sqlj.runtime.OraCustomizer class.
The SQLJ customization process during translation consists of the following steps, as applicable, either during the customization stage of an end-to-end SQLJ run, or when you run SQLJ to customize existing profiles only:
.jar files on the command line, the customizer harness discovers and extracts the profile files within these .jar files..ser files automatically created during an end-to-end SQLJ run, .ser files specified on the command line for customization only, or .ser files extracted from .jar files specified on the command line for customization only).customize() method of the customizer object instantiated in step 2 (customizers used with Oracle SQLJ must have a customize() method).customize() method typically creates and registers a profile customization within the profile. This depends on the intended functionality of the customizer, however. Some might have a specialized purpose that does not require a customization to be created and registered in this way..ser file..jar files on the command line, the customizer harness recreates the .jar contents, inserting each customized .ser file to replace the original corresponding uncustomized .ser file.
When the harness calls the customize() method to customize a profile, it passes in the profile object, a SQLJ connection context object (if you are using a customizer that requires a connection), and an error log object (which is used in logging error messages during the customization).
The same error log object is used for all customizations throughout a single running of SQLJ, but its use is transparent. The customizer harness reads messages written to the error log object, and reports them in real-time to the standard output device (whatever SQLJ uses, typically your screen).
Recall that each profile has a set of entries, where each entry corresponds to a SQL operation. (These would be the SQL operations in your application that use instances of the connection context class associated with this profile.)
A customize() method implements special processing on these entries. It could be as simple as checking each entry to verify its syntax, or it could be more complicated, such as creating new entries that are equivalent to the original entries but are modified to use features of your particular database.
The following paragraphs detail how Oracle implements the customization process. This information is not necessary for most SQLJ developers.
In the case of the Oracle customizer, the customize() method creates a data structure that has one entry for each entry in the original profile. The original entries are never changed, but the new entries are customized to take advantage of features of Oracle9i. For example, if you are using BLOBs, a generic getObject() call used to retrieve a BLOB in the original entry is replaced by a getBLOB() call.
These new entries are encapsulated in an object of a customization class that implements the sqlj.runtime.profile.Customization interface, and this customization object is installed into the profile object. Customization objects, like profile objects, are serializable.
The customizer harness then registers the customization, which is accomplished through functionality of the profile object. Registration allows a profile to keep track of the customizations that it contains.
Any errors encountered during customization are posted to the error log and reported by the customizer harness as appropriate.
A Customization object has an acceptsConnection() method called at runtime to determine if the customization can create a connected profile object for a given SQLJ connection context object. A connected profile object--an instance of a class that implements the sqlj.runtime.profile.ConnectedProfile interface--represents a mapping between a profile object and a JDBC connection. It is equivalent to a JDBC Connection object (underlying a SQLJ connection context object) with the ability to create statements, but supports additional vendor-specific functionality.
The customizer harness outputs error and status messages in much the same way as the SQLJ translator, outputting them to the same output device. None of the warnings regarding customization are suppressible, however.
Error messages reported by the customizer harness fall into four categories:
Status messages reported by the customizer harness during customization allow you to determine whether a profile was successfully customized. They fall into three categories:
.jar file modification statusbackup option is enabled)Additional customizer-specific errors and warnings might be reported by the customize() method of the particular customizer.
During customization, the profile customizer writes messages to its error log, and the customizer harness reads the log contents in real-time and outputs these messages to the SQLJ output device, along with any other harness output. You never have to access error log contents directly.
A customized profile is a static member of the connection context class with which it is associated. For each SQLJ statement in your application, the SQLJ runtime determines the connection context class and instance associated with that statement, then uses the customized profile of the connection context class, together with the underlying JDBC connection of the particular connection context instance, to create a connected profile. This connected profile is the vehicle that the SQLJ runtime uses in applying vendor-specific features to the execution of your SQLJ application.
The following paragraphs details how the Oracle SQLJ runtime uses customized profiles. This information is not necessary for most SQLJ developers.
In executing a SQLJ statement, the SQLJ runtime uses methods of the connection context object associated with the statement, and the profile object associated with the connection context class, as follows:
getConnectedProfile() method.getConnectedProfile() method calls the getConnectedProfile() method of the profile object associated with the connection context class, passing it a connection. (This is the connection instance underlying the connection context instance used for the SQL operation.)getConnectedProfile() method calls the acceptsConnection() method of each Customization object registered in the profile. The first Customization object that accepts the connection creates the connected profile that is passed back to the runtime.This section discusses options for profile customization, which fall into three categories:
This includes general options, connection options, and options that invoke specialized customizers.
All categories of options are specified through the SQLJ command line or properties files.
The following topics are included in this section:
To choose a customizer other than the default Oracle customizer, you can use either the customizer harness customizer option (discussed in "Overview of Customizer Harness Options") or the SQLJ -default-customizer option (discussed in "SQLJ Translator Options for Profile Customization").
The customizer harness provided with Oracle SQLJ offers a number of options that are not specific to a particular customizer. The harness uses these options in its front-end coordination of the customization process.
Customizer harness option settings on the SQLJ command line have the following syntax:
-P-option=value
or, in a SQLJ properties file:
profile.option=value
Enable boolean options (flags) either with:
-P-option
or:
-P-option=true
Boolean options are disabled by default, but you can explicitly disable them with:
-P-option=false
This option syntax is also discussed in "Options to Pass to the Profile Customizer (-P)" and "Properties File Syntax".
The customizer harness supports the following general options:
backup--Save a backup copy of the profile before customizing it.context--Limit customizations to profiles associated with the listed connection context classes.customizer--Specify the customizer to use.digests--Specify digests for .jar file manifests (relevant only if specifying .jar files to customize).help--Display customizer options (specified in SQLJ command-line only).verbose--Display status messages during customization.The customizer harness supports the following options for customizer database connections. Currently, these are used by the Oracle customizer if you enable its optcols option for column definitions (for performance optimization). In addition, they are used by the SQLCheckerCustomizer if you use this specialized customizer to perform online semantics-checking on profiles.
user--Specify the user name for the connection used in this customization.password--Specify the password for the connection used in this customization.url--Specify the URL for the connection used in this customization.driver--Specify the JDBC driver for the connection used in this customization.For information about the Oracle customizer optcols flag, see "Oracle Customizer Column Definition Option (optcols)". For information about the SQLCheckerCustomizer, see "SQLCheckerCustomizer for Profile Semantics-Checking".
The following commands function as customizer harness options, but are implemented through specialized customizers provided with Oracle SQLJ.
debug--Insert debugging information into the specified profiles, to be output at runtime. This is a shortcut to invoke the Oracle SQLJ AuditorInstaller, which is described in "AuditorInstaller Customizer for Debugging".print--Output the contents of the specified profiles, in text format.verify--Perform semantics-checking on a profile that was produced during a previous execution of the SQLJ translator (equivalent to semantics-checking performed on source code during translation). This is a shortcut to invoke the Oracle SQLJ SQLCheckerCustomizer, which is described in "SQLCheckerCustomizer for Profile Semantics-Checking".This section describes general options supported by the customizer harness.
Use the backup flag to instruct the harness to save a backup copy of each .jar file and standalone .ser file before replacing the original. (Separate backups of .ser files that are within .jar files are not necessary.)
Backup file names are given the extension .bakn, where n indicates digits used as necessary where there are similarly named files. For each backup file created, an informational message is issued.
If an error occurs during customization of a standalone .ser file, then the original .ser file is not replaced and no backup is created. Similarly, if an error occurs during customization of any .ser file within a .jar file, then the original .jar file is not replaced and no backup is created.
-P-backup<=true|false>
-P-backup
profile.backup<=true|false>
profile.backup
false
Use the context option to limit customizations to profiles that correspond to the specified connection context classes. Fully qualify the class names and use a comma-delimited list to specify multiple classes. For example:
-P-context=sqlj.runtime.ref.DefaultContext,foo.bar.MyCtxtClass
There must be no space on either side of the comma.
If this option is not specified, then all profiles are customized, regardless of their associated connection context classes.
-P-context=ctx_class1<,ctx_class2,...>
-P-context=foo.bar.MyCtxtClass
profile.context=ctx_class1<,ctx_class2,...>
profile.context=foo.bar.MyCtxtClass
none (customize all profiles)
Use the customizer option to specify which customizer to use. Fully qualify the class name, such as in the following example:
-P-customizer=oracle.sqlj.runtime.util.OraCustomizer
If you do not set this option, then SQLJ will use the customizer specified in the SQLJ -default-customizer option. Unless set otherwise, this is the following:
oracle.sqlj.runtime.util.OraCustomizer
-P-customizer=customizer_class
-P-customizer=a.b.c.MyCustomizer
profile.customizer=customizer_class
profile.customizer=a.b.c.MyCustomizer
none (use default, set in SQLJ -default-customizer option)
When a .jar file is produced, the jar utility can optionally include one or more digests for each entry, based on one or more specified algorithms, so that the integrity of the .jar file entries can later be verified. Digests are similar conceptually to checksums, for readers familiar with those.
If you are customizing profiles in a .jar file and want the jar utility to add new digests (or update existing digests) when the .jar file is updated, use the digests option to specify a comma-delimited list of one or more algorithms. These are the algorithms that jar will use in creating the digests for each entry. The jar utility produces one digest for each algorithm for each .jar file entry in the jar manifest file. Specify algorithms as follows:
-P-digests=SHA,MD5
There must be no space on either side of the comma.
In this example, there will be two digests for each entry in the .jar manifest file--an SHA digest and an MD5 digest.
For information about .jar files and the jar utility, see one of the following Web sites:
http://www.javasoft.com/products/jdk/1.2/docs/guide/jar/index.html
or:
http://java.sun.com/j2se/1.3/docs/guide/jar/index.html
-P-digests=algo1<,algo2,...>
-P-digests=SHA,MD5
profile.digests=algo1<,algo2,...>
profile.digests=SHA,MD5
SHA,MD5
Use the help option to display the option lists of the customizer harness and the default customizer or a specified customizer. For the harness and Oracle customizer, this includes a brief description and the current setting of each option.
Display the option lists for the harness and default customizer as follows (where the default customizer is the Oracle customizer or whatever you have specified in the SQLJ -default-customizer option):
-P-help
Use the help option in conjunction with the customizer option to display the option list of a particular customizer, as follows:
-P-help -P-customizer=sqlj.runtime.profile.util.AuditorInstaller
-P-help <-P-customizer=customizer_class>
-P-help
n/a
n/a
none
Use the verbose flag to instruct the harness to display status messages during customizations. These messages are written to the standard output device--wherever SQLJ writes its other messages.
-P-verbose<=true|false>
-P-verbose
profile.verbose<=true|false>
profile.verbose
false
This section describes connection options supported by the customizer harness. These are used as follows:
optcols option, then there is no need to set the customizer harness user, password, url, and driver options.SQLCheckerCustomizer, a specialized customizer that performs semantics-checking on profiles, uses the customizer harness user, password, url, and driver settings for online checking.
Use -P-verify on the SQLJ command line to invoke this customizer.
Set the user option to specify a database schema if your customizer uses database connections.
In addition to specifying the schema, you can optionally specify the password, URL, or both in your user option setting. The password is preceded by a forward-slash (/), and the URL is preceded by an "at" sign (@), as in the following examples:
-P-user=scott/tiger -P-user=scott@jdbc:oracle:oci:@ -P-user=scott/tiger@jdbc:oracle:oci:@
-P-user=username</password><@url>
-P-user=scott -P-user=scott/tiger -P-user=scott/tiger@jdbc:oracle:oci:@
profile.user=username</password><@url>
profile.user=scott profile.user=scott/tiger profile.user=scott/tiger@jdbc:oracle:oci:@
null
Use the password option if your customizer uses database connections.
The password can also be set with the user option, as described in "Customization User Option (user)".
-P-password=password
-P-password=tiger
profile.password=password
profile.password=tiger
null
Use the url option if your customizer uses database connections.
The URL can also be set with the user option, as described in "Customization User Option (user)".
-P-url=url
-P-url=jdbc:oracle:oci:@
profile.url=url
profile.url=jdbc:oracle:oci:@
jdbc:oracle:oci:@
Use the driver option to register a comma-delimited list of JDBC driver classes if your customizer uses database connections. For example:
-P-driver=sun.jdbc.odbc.JdbcOdbcDriver,oracle.jdbc.OracleDriver
There must be no space on either side of the comma.
-P-driver=dvr_class1<,dvr_class2,...>
-P-driver=sun.jdbc.odbc.JdbcOdbcDriver
profile.driver=dvr_class1<,dvr_class2,...>
profile.driver=sun.jdbc.odbc.JdbcOdbcDriver
oracle.jdbc.OracleDriver
The customizer harness supports the following options that invoke specialized customizers:
debug--This invokes the AuditorInstaller customizer, used in debugging.print--This invokes a customizer that prints a text version of a profile.verify--This invokes the SQLCheckerCustomizer customizer, which performs semantics-checking on a profile.
The debug option runs a specialized customizer, called the AuditorInstaller, that inserts debugging statements into profiles. Use this option in conjunction with a SQLJ command line file list to insert debugging statements into the specified profiles. These profiles must already be customized from a previous SQLJ run.
For detailed information about this customizer, including additional options that it supports, see "AuditorInstaller Customizer for Debugging".
The debugging statements will execute during SQLJ runtime (when someone runs your application), displaying a trace of method calls and values returned.
Following are examples of how to specify the debug option:
sqlj -P-debug Foo_SJProfile0.ser Bar_SJProfile0.ser sqlj -P-debug *.ser
sqlj -P-debug profile_list
sqlj -P-debug Foo_SJProfile*.ser
profile.debug
(Also specify profiles in the SQLJ file list.)
profile.debug
n/a
The print option runs a specialized customizer that prints profiles in text format. Use this option in conjunction with a SQLJ command line file list to output the contents of one or more specified profiles. The output goes to the standard SQLJ output device, typically the user screen.
Following are examples of how to specify the print option:
sqlj -P-print Foo_SJProfile0.ser Bar_SJProfile0.ser sqlj -P-print *.ser
For sample output, see "Sample Profile Entry".
sqlj -P-print profile_list
sqlj -P-print Foo_SJProfile*.ser
profile.print
(Also specify profiles in SQLJ file list.)
profile.print
n/a
The verify option runs a specialized customizer, called the SQLCheckerCustomizer, that performs semantics-checking on a profile. This is equivalent to the semantics-checking that is performed on source code during translation. The profile will have been created during a previous execution of the SQLJ translator.
This option is useful for checking semantics against the runtime database, after deployment, and after the source code may no longer be available.
For detailed information about this customizer, including additional options that it supports, see "SQLCheckerCustomizer for Profile Semantics-Checking".
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Note: For online semantics-checking of the profile, you must also use the customizer harness |
Following are examples of how to specify the verify option. Both of these examples use the SQLCheckerCustomizer default semantics-checker, which employs online checking through the specified database connection. (The first is a single wraparound command.)
sqlj -P-verify -P-user=scott -P-password=tiger -P-url=jdbc:oracle:oci:@ Foo_SJProfile0.ser Bar_SJProfile0.ser sqlj -P-verify -P-user=scott -P-password=tiger -P-url=jdbc:oracle:oci:@ *.ser
sqlj -P-verify <conn params> profile_list
sqlj -P-verify <conn params> Foo_SJProfile*.ser
profile.verify
(You must also specify profiles, and typically customizer harness connection options, in the SQLJ command line.)
profile.verify
n/a
You can set customizer-specific options, such as options for the Oracle customizer, on the SQLJ command line or in a SQLJ properties file. The syntax is similar to that for setting customizer harness options.
Set a customizer option on the SQLJ command line by preceding it with:
-P-C
Alternatively, you can set it in a SQLJ properties file by preceding it with:
profile.C
This option syntax is also discussed in "Options to Pass to the Profile Customizer (-P)" and "Properties File Syntax".
The remainder of this section discusses features of the Oracle customizer, which supports several options. Most of these options are boolean and are enabled as follows:
-P-Coption
or:
-P-Coption=true
Boolean options are disabled by default, but you can explicitly disable them with:
-P-Coption=false
Numeric or string options are set similarly:
-P-Coption=value
This section describes options that are specific to the Oracle customizer, beginning with an overview of the options supported.
The Oracle customizer implements the following options:
compat--Display version compatibility information.force--Instruct the customizer to customize even if a valid customization already exists.optcols--Enable iterator column type and size definitions to optimize performance.optparams--Enable parameter size definitions to optimize JDBC resource allocation (used in conjunction with optparamdefaults).optparamdefaults--Set parameter size defaults for particular datatypes (used in conjunction with optparams).fixedchar--Enable CHAR comparisons with blank padding for WHERE clauses.showSQL--Display SQL statement transformations.stmtcache--Set the statement cache size (the number of statements that can be cached for each connection during runtime) for performance optimization, or set it to zero to disable statement caching.summary--Display a summary of Oracle features used in your application.Any output displayed by these options is written to the standard output device, wherever SQLJ writes its other messages.
Use the compat flag to instruct the Oracle customizer to display information about compatibility of your application with different versions of the Oracle database and Oracle JDBC drivers. This can be accomplished either during a full SQLJ translation run or on profiles previously created.
For example, to see compatibility output when translating and customizing the application MyApp:
sqlj <...SQLJ options...> -P-Ccompat MyApp.sqlj
In this example, the MyApp profiles will be created, customized, and checked for compatibility in a single running of SQLJ.
To see compatibility output for MyApp profiles previously created:
sqlj <...SQLJ options...> -P-Ccompat MyApp_SJProfile*.ser
In this example, the MyApp profiles were created (and possibly customized) in a previous running of SQLJ and will be customized (if needed) and checked for compatibility in the above running of SQLJ.
Following are two output samples from a -P-Ccompat setting when using the default Oracle customizer. The first example indicates that the application can be used with all Oracle JDBC driver versions:
MyApp_SJProfile0.ser: Info: compatible with all Oracle JDBC drivers
This second example indicates that the application can be used only with Oracle JDBC release 8.1 or later:
MyApp_SJProfile0.ser: Info: compatible with Oracle 8.1 or later JDBC driver
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Note: If customization does not take place because a valid previous customization is detected, the |
-P-Ccompat<=true|false>
-P-Ccompat
profile.Ccompat<=true|false>
profile.Ccompat
false
Use the force flag to instruct the Oracle customizer to force the customization of a given profile (specified on the command line) even if a valid customization already exists in that profile. For example:
sqlj -P-Cforce MyApp_SJProfile*.ser
This will customize all the MyApp profiles, regardless of whether they have already been customized. Otherwise, by default, the Oracle customizer will not reinstall over a previously existing customization unless the previous one had been installed with an older version of the customizer.
-P-Cforce<=true|false>
-P-Cforce
profile.Cforce<=true|false>
profile.Cforce
false
Use the optcols flag to instruct the Oracle customizer to determine types and sizes of iterator or result set columns and add this information to the profile. This enables the SQLJ runtime to automatically register the columns with the Oracle JDBC driver when your application runs, saving round trips to Oracle depending on the particular driver implementation. Specifically, this is effective for the Thin driver and positional iterators.
For an overview of column definitions, see "Column Definitions".
An error will be generated if you enable the Oracle customizer optcols option without setting the user name, password, and URL for a database connection. You can accomplish this through the translator -user, -password, and -url options, which are forwarded to the customizer during ISO standard code generation, or directly through the customizer user, password, and url options.
The customizer does not have to connect to the same schema or even the same database that your application will connect to at runtime, but the relevant columns will have to be in the same order and of identical types and sizes to avoid runtime errors.
For information about the customizer harness connection options, see the user, password, url, and driver sections under "Overview of Customizer Harness Options".
|
Note: You can use the SQLJ translator That section also has some additional conceptual information. |
You can enable or disable the customizer optcols flag on the SQLJ command line or in a properties file.
Enable it on the command line as follows:
-P-Coptcols
or:
-P-Coptcols=true
This flag is disabled by default, but you can also disable it explicitly. Disable it on the command line as follows:
-P-Coptcols=false
Column definitions require the customizer to make a database connection to examine columns of tables being queried, so the customizer harness user, password, and url options must be set appropriately (as well as the customizer harness driver option if you are not using the default OracleDriver class). For example:
sqlj <...SQLJ options...> -P-user=scott/tiger@jdbc:oracle:oci:@ -P-Coptcols MyApp.sqlj
Note that as with the SQLJ translator, you can optionally set the password and URL in the user option instead of in the password and url options.
Alternatively, you can insert column definitions into a previously existing profile. In this case you must also use the Oracle customizer force option to force a recustomization:
sqlj -P-user=scott/tiger@jdbc:oracle:oci:@ -P-Cforce -P-Coptcols MyApp_SJProfile*.ser
You also can insert column definitions into previously existing profiles in a .jar file:
sqlj -P-user=scott/tiger@jdbc:oracle:oci:@ -P-Cforce -P-Coptcols MyAppProfiles.jar
When you run the Oracle customizer with its optcols flag enabled, either during translation and creation of a new profile or during customization of an existing profile, you can also enable the customizer harness verbose flag. This will instruct the Oracle customizer to display information about what iterators and result sets are being processed and what their column type and size definitions are. For example:
sqlj -P-user=scott/tiger@jdbc:oracle:oci:@ -P-verbose -P-Cforce -P-Coptcols MyApp_SJProfile*.ser
For general information about the verbose flag, see that section under "Overview of Customizer Harness Options".
You can execute the Oracle customizer with its summary flag enabled on an existing profile to determine if column definitions have been added to that profile:
sqlj -P-Csummary MyApp_SJProfile*.ser
For general information about the summary flag, see that section under "Overview of Customizer-Specific Options".
-P-Coptcols<=true|false>
-P-Coptcols
profile.Coptcols<=true|false>
profile.Coptcols
false
Use the optparams flag to enable parameter size definitions. If this flag is enabled, SQLJ will register your input and output parameters (host variables) to optimize JDBC resource allocations according to sizes you specify.
For an overview of parameter size definitions and a discussion of source code hints, see "Parameter Size Definitions".
|
Note: You can use the SQLJ translator That section also has some additional conceptual information. |
You can enable or disable the optparams flag on the command line or in a SQLJ properties file.
Enable it on the command line as follows:
-P-Coptparams
or:
-P-Coptparams=true
This flag is disabled by default, but you can also disable it explicitly. Disable it on the command line as follows:
-P-Coptparams=false
|
Note: Unlike the |
Following is a command-line example (omitting a setting for the optparamdefaults option, which is discussed in the next section):
sqlj <...SQLJ options...> -P-Coptparams -P-Coptparamdefaults=defaults_string MyApp.sqlj
or, to enable parameter size definitions for a previously existing profile:
sqlj -P-Coptparams -P-Coptparamdefaults=defaults_string MyApp_SJProfile*.ser
or, for previously existing profiles in a .jar file:
sqlj -P-Coptparams -P-Coptparamdefaults=defaults_string MyAppProfiles.jar
-P-Coptparams<=true|false>
-P-Coptparams
profile.Coptparams<=true|false>
profile.Coptparams
false
If you enable the optparams option to set parameter sizes, use the optparamdefaults option as desired to set default sizes for specified datatypes. If optparams is not enabled, then any optparamdefaults setting is ignored.
For an overview of parameter size definitions and a discussion of source code hints, see "Parameter Size Definitions".
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Note: You can use the SQLJ translator That section also has important additional conceptual and syntax information. Functionality of the two options is equivalent. |
You can set the optparamdefaults flag on the command line or in a SQLJ properties file.
Set it on the command line as follows:
-P-Coptparamdefaults=datatype1(size1),datatype2(size2),...
Following is a command-line example, including the optparams setting as well:
sqlj <...SQLJ options...> -P-Coptparams -P-Coptparamdefaults=CHAR_TYPE(50),RAW_TYPE(500),CHAR(10) MyApp.sqlj
The syntax is explained in "Parameter Default Size (-optparamdefaults)".
Alternatively, you can specify parameter size defaults for a previously existing profile, in which case you must also use the Oracle customizer force option to force a recustomization:
sqlj -P-Cforce -P-Coptparams -P-Coptparamdefaults=CHAR_TYPE(50),RAW_TYPE(500),CHAR(10) MyApp_SJProfile*.ser
You also can specify parameter size defaults for previously existing profiles in a .jar file:
sqlj -P-Cforce -P-Coptparams -P-Coptparamdefaults=CHAR_TYPE(50),RAW_TYPE(500),CHAR(10) MyAppProfiles.jar
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Note: If at runtime the actual size exceeds the registered size of any parameter, runtime errors will occur. |
-P-Coptparamdefaults=defaults_string
-P-Coptparamdefaults=VAR%(50),LONG%(500),RAW_TYPE()
profile.Coptparamdefaults=defaults_string
profile.Coptparamdefaults=VAR%(50),LONG%(500),RAW_TYPE()
null
Set this flag to true to account for blank padding in CHAR database columns when binding character strings for WHERE clause comparisons. This way, for example, "mystring" would compare positively against "mystring ".
Here is an example of Oracle customizer fixedchar usage:
% sqlj -P-Cfixedchar MyProgram.sqlj AnotherProg.java ...
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Notes:
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-P-Cfixedchar<=true|false>
-P-Cfixedchar
profile.Cfixedchar<=true|false>
profile.Cfixedchar
false
Use the showSQL flag to display any SQL statement transformations performed by the Oracle customizer. Such transformations are necessary in cases where SQLJ supports syntax that Oracle9i does not. For example, to show SQL transformations when translating and customizing the application MyApp:
sqlj <...SQLJ options...> -P-CshowSQL MyApp.sqlj
In this example, the MyApp profiles will be created and customized and their SQL transformations displayed in a single running of SQLJ.
To show SQL transformations when customizing MyApp profiles previously created:
sqlj <...SQLJ options...> -P-CshowSQL MyApp_SJProfile*.ser
In this example, the MyApp profiles were created (and possibly customized) in a previous running of SQLJ and will be customized (if needed) and have their SQL transformations displayed in the above running of SQLJ.
The showSQL output might include an entry such as this:
MyApp.sqlj:14: Info: <<<NEW SQL>>> #sql {BEGIN ? := VALUES(tkjsSET_f1); END}; in file MyApp, line 14, we had: #sql {set :v1= VALUES(tkjsSET_f1) };
SQLJ supports the SET statement, but Oracle9i does not. During customization, the Oracle customizer replaces the SET statement with an equivalent PL/SQL block.
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Note: If customization does not take place because a valid previous customization is detected, the |
-P-CshowSQL<=true|false>
-P-CshowSQL
profile.CshowSQL<=true|false>
profile.CshowSQL
false
Use the Oracle customizer stmtcache option to set the statement cache size--the number of statements that can be cached for each database connection as your application runs--or to disable statement caching.
The default statement cache size is 5. For an overview of statement caching, see "Statement Caching".
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Important: With the default Oracle-specific code generation ( |
You can set the statement cache size on the command line or in a properties file.
To use the command line to set the statement cache size to 15 (for example) for the application MyApp:
sqlj <...SQLJ options...> -P-Cstmtcache=15 MyApp.sqlj
To disable statement caching, set the cache size to 0:
sqlj <...SQLJ options...> -P-Cstmtcache=0 MyApp.sqlj
You also can alter the statement cache size in an existing profile without re-translating the application, but you must also use the Oracle customizer force option to force a recustomization, as follows:
sqlj -P-Cforce -P-Cstmtcache=15 MyApp_SJProfile0.ser
If you have multiple profiles, you can set their statement cache sizes individually by running SQLJ separately for each profile, after you have translated your application:
sqlj -P-Cforce -P-Cstmtcache=10 MyApp_SJProfile0.ser sqlj -P-Cforce -P-Cstmtcache=15 MyApp_SJProfile1.ser sqlj -P-Cforce -P-Cstmtcache=0 MyApp_SJProfile2.ser
Of course, you must determine which profile corresponds to each of your connection context classes. This is determined as follows: profile 0 will correspond to the connection context class used for the first executable statement in your application; profile 1 will correspond to the connection context class used for the first executable statement that does not use the first connection context class, and so on. You can verify the correlation by using the customizer harness print option to examine each profile.
-P-Cstmtcache=value
-P-Cstmtcache=10
profile.Cstmtcache=value
profile.Cstmtcache=10
5
Use the summary flag to instruct the Oracle customizer to display a summary of Oracle features used in an application being translated, or in specified profile files. This is useful in identifying features that would prevent portability to other platforms and can be accomplished either during a full SQLJ translation run or on profiles previously created.
To see summary output when translating and customizing the application MyApp:
sqlj <...SQLJ options...> -P-Csummary MyApp.sqlj
In this example, the MyApp profiles will be created, customized, and summarized in a single running of SQLJ.
To see summary output for MyApp profiles previously created:
sqlj <...SQLJ options...> -P-Csummary MyApp_SJProfile*.ser
In this example, the MyApp profiles were created (and possibly customized) in a previous running of SQLJ and will be customized (if needed) and summarized in the above running of SQLJ.
Following are two samples resulting from a -P-Csummary setting when using the default Oracle customizer. The first example indicates no Oracle features are used:
MyApp_SJProfile0.ser: Info: Oracle features used: MyApp_SJProfile0.ser: Info: * none
This second example indicates that Oracle features are used--namely, several Oracle extended datatypes from the oracle.sql package--and lists them:
MyApp_SJProfile0.ser: Info: Oracle features used: MyApp_SJProfile0.ser: Info: * oracle.sql.NUMBER: 2 MyApp_SJProfile0.ser: Info: * oracle.sql.DATE: 2 MyApp_SJProfile0.ser: Info: * oracle.sql.CHAR: 2 MyApp_SJProfile0.ser: Info: * oracle.sql.RAW: 2
The following example prints out the number of usages of the Oracle setFixedCHAR() API (enabled through the Oracle customizer fixedchar option, to account for blank padding when binding a string into a WHERE clause for comparison against CHAR data):
% sqlj -P-Cfixedchar -P-Csummary -P-Cforce *.ser FC_SJProfile0.ser: Info: re-installing Oracle customization FC_SJProfile0.ser: Info: Oracle features used: FC_SJProfile0.ser: Info: * setFixedCHAR(): 4
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Note: If customization does not take place because a valid previous customization is detected, the |
-P-Csummary<=true|false>
-P-Csummary
profile.Csummary<=true|false>
profile.Csummary
false
Oracle SQLJ provides additional, specialized customizers described later in this chapter. These customizers also have command-line options:
SQLCheckerCustomizer (for profile semantics-checking)--See "SQLCheckerCustomizer for Profile Semantics-Checking" for general information, and "SQLCheckerCustomizer Options" for information about its options.AuditorInstaller (for debugging)--See "AuditorInstaller Customizer for Debugging" for general information, and "AuditorInstaller Options" for information about its options.The following SQLJ translator options relate to profile customization and are described elsewhere in this manual:
-default-customizer--Specify the default profile customizer to use if none is specified in the customizer harness -customizer option.
-profile--Specify whether to customize during this running of SQLJ.
As discussed previously, you can specify a .jar file on the SQLJ command line in order to customize any profiles that the .jar file contains.
When using a .jar file for profiles, the manifest entry for each profile must contain the line:
SQLJProfile: TRUE
Accomplish this by: 1) creating a plain text file with two lines for each profile that will be included in the .jar file--one line specifying the path or package and name, and one line as above; and 2) using the jar utility -m option to input this file.
The two lines must be consecutive (no blank line in between), and there must be a blank line preceding line-pairs for additional profiles.
For example, presume your MyApp application (in the directory foo/bar) has three profiles, and you will be creating a .jar file