You cannot use connection sharing in WebSphere Application Server if you use context caching. It is highly recommended that you use online checking when you customize your serialized profiles. You might do this if you have changed an SQLJ source program, and you want to run the old and new versions of the program. Binding a plan might simplify authorization for the application. Customizing multiple serialized profiles together:
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When db2sqljcustomize runs, it creates a customized serialized profile.
Supported drivers for JDBC and SQLJ
Sqlm default behavior is to do online checking. When you bind the packages, you need to specify the following bind option values: The four generated package names are of the following form: The advantages of developing applications with SQLJ include improved performance and a shorter, more efficient development cycle.
If you do not specify -rootpkgname or -singlepkgname, db2sqljcustomize generates four package names that are based on the serialized profile name. You can authorize users to execute the plan, rather than authorizing them to execute each of the packages in the plan.
This name must be enclosed in double quotation marks “. When you run the new version of the program, Db2 loads the new versions of the packages.
Customization stores a new package timestamp in the serialized profile, which makes the new serialized profile incompatible with the original package. Letting db2sqljcustomize generate package names is not recommended.
Deploying SQLJ applications
When -zosDescProcParms is specified, the Db2 data server sq,j the specified or default sqj of -zosProcedurePath to resolve unqualified names of stored procedures for which SQL data type information is requested. Write less code with the simpler SQLJ syntax, which reduces the number of lines of code slj is required to execute statements, set parameters, and retrieve parameters.
If a bind fails when db2sqljcustomize runs if you want to create identical packages at multiple locations for the same serialized profile. After you bind the packages, you need to ensure that when the application runs, the Db2 database server at ZOS2 can find the packages.
Bytes-from-program-name IDNumber PkgIsolation Table 1 shows the parts of a generated package name and the number of bytes for each part.
When an SQLJ program is executed, the driver uses the collection name that is stored in the customized serialized profile to search for packages to execute.
When you run the programs at these data sources, the Db2 objects that the programs access must be identical at every data source. The client connects directly to the data source. To optimize a query properly that contains character host variables, Db2 needs the length of the host variables.
The number of packages and the isolation levels of those packages are controlled by the -rootpkgname and -singlepkgname options. You might need a different qualifier for unqualified Db2 objects on each of the database servers.
Example of a simple SQLJ application
For example, suppose that you want the translator to process two files: Run db2sqljcustomize to customize the serialized profile and create Db2 packages with the same package names and in the same collection as the original packages. Bind a plan for the application that includes the following packages: The application can make type 2 and type aqlj connections using this single driver instance.
The Db2 data server tries the schema names in the SQL path from left to right until it finds a match with the name of a stored sq,j that exists on that database server.
If the collection ID for the additional Db2 packages that you create is different from the collection ID in the serialized profile, you need to override the collection ID that is in the serialized profile.
You can specify serialized profile names in one of the following ways: Improve performance by using static SQL statements.
If -longpkgname is not specified, package-name must be an alphanumeric string of eight or fewer bytes. Ensure that you do dqlj overwrite your original serialized profile.
sqlj – SQLJ translator – IBM DB2 for Linux, UNIX, and Windows
The translator uses the directory structure of the SQLJ source files when it puts the generated files in directories. Customizing multiple serialized profiles together: The generated source file is named program-name.
The sqoj use a native client library specific to the data source to which they connect. If the connection is to a Db2 on Linux, UNIX, and Windows systems server, database is the database name that is defined during installation.