create barcode with vb.net The CallableStatement Object in Java

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The CallableStatement Object
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Programmers use the CallableStatement object to call a stored procedure A stored procedure is a block of code that is identified by a unique name and is stored in the DBMS The nature of the block of code is dependent on the DBMS Typically, the code is written in PS/SQL, TransactSQL, C, or another programming language You execute a stored procedure by sending the DBMS the name of the stored procedure and then telling the DBMS to run it Programmers call this invoking the name of the stored procedure Stored procedures are frequently used in applications where a block of code is executed multiple times in order to minimize the time necessary to transport the block of code across the network and have it compiled A stored procedure is transported and compiled once, and you execute it subsequent times by invoking its name
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CHAPTER 13 JDBC and Java Data Objects
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Three parameters are used when calling a stored procedure with the CallableStatement object These are IN, OUT, and INOUT The IN parameter contains the data needed for the stored procedure to execute, which is similar to a parameter of a method You set the value of the IN parameter by calling the setXXX() method, which was described in the previous section The OUT parameter contains the value returned after the stored procedure fini s h e s executing The out parameter must be registered using the registerOutParameter() method and then is later retrieved by using the getXXX() method The getXXX() method is very similar to the setXXX() method except the getXXX() method retrieves a value instead of setting a value The XXX is replaced with the appropriate data type of the value identical to the setXXX() method The INOUT parameter is used to pass information to the stored procedure and to retrieve information from a stored procedure using the techniques described in the previous two paragraphs The following example illustrates how to call a stored procedure and retrieve a value returned by the stored procedure This example is similar to other listings used in this chapter, but it has been modified slightly to call a stored procedure
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String url = "jdbc:odbc:Registration"; String userID = "jim"; String password = "keogh"; String lastOrderNumber; Connection dB; try { ClassforName( "sunjdbcodbcJdbcOdbcDriver"); dB = DriverManagergetConnection(url,userID,password); } catch (ClassNotFoundException e) { Systemerrprintln( "Unable to load the JDBC/ODBC bridge" + e); Systemexit(1); } catch (SQLException e) { Systemerrprintln( "Cannot connect to the database" + e); Systemexit(2); }try { String query = "{ CALL LastOrderNumber}"; CallableStatement cstatement = dBprepareCall(query); cstatementregisterOutParameter(1, Types VARCHAR); cstatementexecute();
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lastOrderNumber = cstatementgetString(1); } catch ( SQLException e ){ Systemerrprintln("SQL error" + e); Systemexit(3); } finally { cstatementclose(); dBclose(); }
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You ll notice that the first statement in the second try { } block creates the SQL query that calls the stored procedure LastOrderNumber, which retrieves the most recently used order number Next, the prepareCall() method of the Connection object is called and is passed the SQL query, which returns a CallableStatement object called c s t a t e m e n t The O U T parameter must be r egistered using the registerOutParameter() method of the CallableStatement object The registerOutParameter() method requires two parameters The first parameter is an integer that represents the number of the parameter, which is 1 This means that the parameter is the first parameter of the stored procedure The second parameter of registerOutParameter() is the data type of the value returned by the stored procedure, which is TypesVARCHAR Next, the execute() method of the CallableStatement object is called to execute the SQL query Notice that the execute() method doesn t require the name of the query This is because the query is already identified when the CallableStatement object is returned by the prepareCall() SQL query method The getString() method is called once the stored procedure executes to retrieve the return value of the stored procedure, which is the last order number
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