Weblogic: Call DB2 stored procedure without schema name (property currentSchema)

Question

Hello,

I have a Java application that runs on Weblogic. The application needs to access a stored procedure in a DB2 data base, therefore a JDBC data source is configured and accessed by its JNDI name.

Data source:

ClassDriver: com.ibm.db2.jcc.DB2Driver

Properties:
user=MYUSER
DatabaseName=MYDB

The following example works as expected.

Context env = null;
DataSource pool = null;

Hashtable ht = new Hashtable();
ht.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
ht.put(Context.PROVIDER_URL,"t3://myserver:7777");

env = new InitialContext(ht);

pool = (DataSource) env.lookup("jdbc/myjndiname");
conn = pool.getConnection();

// call stored procedure with schema name
String procName = "MYSCHEMA.MYSTOREDPROCEDURE";
String sql = "CALL " + procName + "(?)";
callStmt = conn.prepareCall(sql);

callStmt.setString(1, "1");
callStmt.execute();

But now I need to call the stored procedure without the schema name and use a JDBC driver property instead.

Data source:

ClassDriver: com.ibm.db2.jcc.DB2Driver

Properties:
user=MYUSER
DatabaseName=MYDB
db2.jcc.override.currentSchema=MYSCHEMA
com.ibm.db2.jcc.DB2BaseDataSource.currentSchema=MYSCHEMA 

The following SQL call results in an error

// call stored procedure without schema name
String procName = "MYSTOREDPROCEDURE";
String sql = "CALL " + procName + "(?)";
callStmt = conn.prepareCall(sql);

SQL error:

SQLCODE = -440, ERROR:  NO PROCEDURE BY THE NAME MYSTOREDPROCEDURE HAVING
COMPATIBLE ARGUMENTS WAS FOUND IN THE CURRENT PATH 

I assume that the "currentSchema" properties are wrong.

Edit: It looks like I was wrong: the property currentSchema is not the problem! The SQL statement "select current_schema fromsysibm.sysdummy1" returns the correct schema (MYSCHEMA). The question is now, why "CALL MYSCHEMA.MYSTOREDPROCEDURE(?)" works and "CALL MYSTOREDPROCEDURE(?)" results in an error...

Any suggestions? Thanks!

Answer 1

You can at highest specify it in the JDBC URL of the datasource. E.g.

jdbc:db2://hostname:port/DBNAME:currentSchema=MYSCHEMA;

This however affects all connections coming from the same datasource.

Answer 2

Stored procedure (and function) resolution is not controlled by the CURRENT SCHEMA special register. It is controlled by the CURRENT PATH special register.

So, you can either:

• Execute the SQL statement SET CURRENT PATH = MYSCHEMA
  or

• Use the currentFunctionPath JDBC property.