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4. When all parameter values have been supplied, the program calls executeQuery or executeUpdate to execute the statement. 5. The program repeats Steps 3 and 4 over and over (typically dozens or hundreds of times or more), varying the parameter values. If a particular parameter s value does not change from one execution to the next, the set method does not need to be recalled. Here is a program excerpt that illustrates the technique:
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// The connection object, strings and variables Connection dbconn; // the database connection String city; // returned city String str1 = UPDATE OFFICES SET REGION = WHERE MGR = ; String str2 = SELECT CITY FROM OFFICES WHERE REGION = ;
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<code in here creates the connection>
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// Prepare the UPDATE statement PreparedStatement pstmt1 = dbconn.prepareStatement(str1); // Prepare the query PreparedStatement pstmt2 = dbconn.prepareStatement(str2); // Set parameters for UPDATE statement & execute it pstmt1.setString(1,"Central"); pstmt1.setInt(2,108); pstmt1.executeUpdate(); // Reset one of the parameters and execute again, then commit pstmt1.setInt(2,104); pstmt1.executeUpdate(); dbconn.commit()/ // Set parameter for query & execute it pstmt2.setString(1,"Central"); ResultSet answer = pstmt2.executeQuery(); // Loop through ResultSet a row at a time while (answer.next()) { // Retrieve each column of data city = answer.getString(1);
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// Print the row of results System.out.println( Central city is + city); } answer.close(); // Set a different parameter for query & execute it pstmt2.setString(1,"Eastern"); ResultSet answer = pstmt2.executeQuery(); // Loop through ResultSet a row at a time while (answer.next()) { // Retrieve each column of data city = answer.getString(1); // Print the row of results System.out.println( Eastern city is + city); } answer.close(); // Done close the connection dbconn.close();
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The last several sections described how JDBC supports dynamic SQL statement execution (via the Statement object created by the createStatement() method) and prepared SQL statements (via the PreparedStatement object created by the prepareStatement() method). JDBC also supports the execution of stored procedures and stored functions through a third type of statement object, the CallableStatement object created by the prepareCall() method. Here is how a Java program invokes a stored function or stored procedure using JDBC: 1. The Java program invokes the prepareCall() method, passing it a SQL statement that invokes the stored routine. Parameters to the call are indicated by parameter markers within the statement string, just as they are for a prepared statement. 2. The method returns a CallableStatement object. 3. The Java program uses the set() methods of the CallableStatement object to specify parameter values for the procedure or function call. 4. The Java program uses another method of the CallableStatement object to specify the data types of returned values from the stored procedure or function.
PROGRAMMING WITH SQL
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5. The Java program invokes one of the CallableStatement object s execute() methods to actually make the call to the stored procedure. 6. Finally, the Java program invokes one or more of the CallableStatement object s get() methods to retrieve the values returned by the stored procedure (if any) or the return value of the stored function. A CallableStatement object provides all of the methods of a PreparedStatement, listed in Tables 19-16 and 19-18. The additional methods that it provides for registering the data types of output or input/output parameters, and for retrieving the returned values of those parameters after the call, are shown in Table 19-19.
Function
Description
registerOutParameter() Registers data type for output (or input/output) parameter getInt() getShort() getLong() getFloat() getDouble() getString() getBoolean() getDate() getTime() getTimestamp() getByte() getBytes() getBigDecimal() getObject() Table 19-19. Retrieves integer returned value Retrieves short integer value from specified column Retrieves long integer value from specified column Retrieves floating point numeric value from specified column Retrieves double-precision floating point value from specified column Retrieves character string value from specified column Retrieves true/false value from specified column Retrieves single date value from specified column Retrieves single time value from specified column Retrieves single timestamp value from specified column Retrieves single byte value from specified column Retrieves fixed-length or variable-length BINARY data Retrieves DECIMAL or NUMERIC data Retrieves any type of data
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