PL/SQL Stored Procedures
Oracle JDBC drivers support execution of PL/SQL stored procedures and anonymous blocks. They support both SQL92 escape syntax and Oracle PL/SQL block syntax. The following PL/SQL calls would work with any Oracle JDBC driver:
// SQL92 syntax CallableStatement cs1 = conn.prepareCall ( "{call proc (?,?)}" ) ; // stored proc CallableStatement cs2 = conn.prepareCall ( "{? = call func (?,?)}" ) ; // stored func // Oracle PL/SQL block syntax CallableStatement cs3 = conn.prepareCall ( "begin proc (?,?); end;" ) ; // stored proc CallableStatement cs4 = conn.prepareCall ( "begin ? := func(?,?); end;" ) ; // stored func
As an example of using Oracle syntax, here is a PL/SQL code snippet that creates a stored function. The PL/SQL function gets a character sequence and concatenates a suffix to it:
create or replace function foo (val1 char) return char as begin return val1 || 'suffix'; end;Your invocation call in your JDBC program should look like:
Connection conn = DriverManager.getConnection ("jdbc:oracle:oci:@", "scott", "tiger"); CallableStatement cs = conn.prepareCall ("begin ? := foo(?); end;"); cs.registerOutParameter(1,Types.CHAR); cs.setString(2, "aa"); cs.executeUpdate(); String result = cs.getString(1);
Calling PL SQL from Java
JDBC and SQLJ allow you to call PL/SQL stored functions and procedures. For example, suppose you want to call the following stored function, which returns the balance of a specified bank account:
FUNCTION balance (acct_id NUMBER) RETURN NUMBER IS acct_bal NUMBER; BEGIN SELECT bal INTO acct_bal FROM accts WHERE acct_no = acct_id; RETURN acct_bal; END;From a JDBC program, your call to the function balance might look like this:
CallableStatement cstmt = conn.prepareCall("{? = CALL balance(?)}"); cstmt.registerOutParameter(1, Types.FLOAT); cstmt.setInt(2, acctNo); cstmt.executeUpdate(); float acctBal = cstmt.getFloat(1);
Calling a Stored Procedure in a Database
This example demonstrates how to call stored procedures with IN, OUT, and IN/OUT parameters.CallableStatement cs; try { // Call a procedure with no parameters cs = connection.prepareCall("{call myproc}"); cs.execute(); // Call a procedure with one IN parameter cs = connection.prepareCall("{call myprocin(?)}"); // Set the value for the IN parameter cs.setString(1, "a string"); // Execute the stored procedure cs.execute(); // Call a procedure with one OUT parameter cs = connection.prepareCall("{call myprocout(?)}"); // Register the type of the OUT parameter cs.registerOutParameter(1, Types.VARCHAR); // Execute the stored procedure and retrieve the OUT value cs.execute(); String outParam = cs.getString(1); // OUT parameter // Call a procedure with one IN/OUT parameter cs = connection.prepareCall("{call myprocinout(?)}"); // Register the type of the IN/OUT parameter cs.registerOutParameter(1, Types.VARCHAR); // Set the value for the IN/OUT parameter cs.setString(1, "a string"); // Execute the stored procedure and retrieve the IN/OUT value cs.execute(); outParam = cs.getString(1); // OUT parameter } catch (SQLException e) { }
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