qr barcode generator vb.net Additional Methods of the CallableStatement Object in Software

Generator Quick Response Code in Software Additional Methods of the CallableStatement Object

Additional Methods of the CallableStatement Object
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A short example is the best way to illustrate the technique for calling a stored procedure and stored function. (The body of the procedure and function are omitted from this example because the point is how they are called rather than what they do.) Suppose the sample database contains a stored procedure defined like this:
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CREATE (IN OUT IN PROCEDURE CHANGE_REGION OFFICE INTEGER, OLD_REG VARCHAR(10), NEW_REG VARCHAR(10));
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that changes the region of an office, as requested by the two input parameters, and returns the old region as an output parameter and a stored function, defined like this:
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CREATE FUNCTION GET_REGION (IN OFFICE INTEGER) RETURNS VARCHAR(10);
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that returns the region of an office, given its office number. This Java program excerpt shows how to invoke the stored procedure and stored function using JDBC:
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// The connection object, strings, and variables Connection dbconn; // the database connection String str1 = "{CALL CHANGE_REGION( , , )}"; String str2 = "{ = CALL GET_REGION( )}"; String oldreg; // returned former region String ansreg; // returned current region <code in here creates the connection> // Prepare the two statements CallableStatement cstmt1 = dbconn.prepareCall(str1); CallableStatement cstmt2 = dbconn.prepareCall(str2); // Specify param values & returned data types for stored procedure call cstmt1.setInt(1,12); // call with office number 12 (Chicago) cstmt1.setString(3,"Central"); // and new Central region cstmt1.registerOutParameter(2,Types.VARCHAR); // returns a varchar param // Go ahead and execute the call to the stored procedure cstmt1.executeUpdate(); oldreg = cstmt.getString(2); // returned (2nd) param is a string // Specify param values & returned data type for stored function call cstmt2.setInt(1,12); // call with office number 12 (Chicago) cstmt2.registerOutParameter(1,Types.VARCHAR); // fcn returns a varchar // Go ahead and execute the call to the stored function cstmt2.executeUpdate(); ansreg = cstmt.getString(1); // returned value (1st param) is a string // Done close the connection dbconn.close();
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Part V:
Programming with SQL
Note that the call invocations of the stored procedure or function in the statement strings are enclosed in curly brackets. The input parameters passed to a stored procedure or function are handled exactly the same way as parameters for a prepared statement. Output parameters from a stored procedure require some new machinery: the registerOutParameter() method call to specify their data types, and calls to the get() methods to retrieve their values after the call is complete. These are summarized in Table 19-19. Input/output parameters for a stored procedure require both that values be passed into the procedure call, using the set() methods, and that the output data type be specified with registerOutParameter() and that the returned data be retrieved with the get() methods. For a stored function, there are only input parameters, and the set() methods are once again used. The return value of the function is specified with a parameter marker in the prepared statement string. Its data type is registered, and its value is retrieved, just as if it were a regular output parameter.
Error Handling in JDBC
When an error occurs during JDBC operation, the JDBC interface throws a Java exception. Most SQL statement execution errors throw a SQLException. The error can be handled via the standard Java try/catch mechanism. When a SQLException error occurs, the catch() method is called with a SQLException object, some of whose methods are summarized in Table 19-20. The SQLException methods allow you to retrieve the error message, SQLSTATE error code, and DBMS-specific error code associated with the error. A single JDBC operation can create more than one error. In this case, the errors are available to your program in sequence. Calling getNextException() on the first reported error returns a SQLException for the second exception, and so on, until no more exceptions are to be handled.
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