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CHAPTER 5 STATEMENT AND PREPAREDSTATEMENT
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Notice that the literal placeholder has been replaced by a parameter name of our choice preceded with a colon (:). We then use setIntAtName() of the OraclePreparedStatement interface for the first parameter and setDataAtName() for the second parameter: public void setIntAtName(java.lang.String parameterName, java.sql.Date value) throws SQLException; public void setDateAtName(java.lang.String parameterName, java.sql.Date value) throws SQLException;
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Executing a PreparedStatement
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To execute a PreparedStatement, you can use one of the following three methods: public boolean execute()throws SQLException public ResultSet executeQuery()throws SQLException public int executeUpdate()throws SQLException The logic of when to use each method is the same as that for the methods with the same names in the Statement interface discussed in the section The Statement Interface. Notice, however, that unlike their counterparts in Statement interface, these methods don t take a SQL string. This is because the SQL statement itself has already been precompiled at the time you invoke the prepareStatement() method of the Connection object. It s time for some examples that illustrate all of the steps just described. Let s first look at an example that queries data.
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Example of Using PreparedStatement to Query Data
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The class DemoPreparedStatementQuery described in this section illustrates how to use the PreparedStatement interface in JDBC programs to select data from a database. It illustrates binding by parameter index and binding by parameter name. After the necessary imports, we have the main() method of the class: /* This program demonstrates how to query data from a table * using the PreparedStatement interface. It illustrates * binding a parameter both by index and by name. * COMPATIBLITY NOTE: runs successfully against 10.1.0.2.0. * against 9.2.0.1.0, you have to comment out the * code using the binding by name feature to compile and * run this, as bind by name is not supported in 9i. */ import java.sql.ResultSet; import java.sql.SQLException; import java.sql.PreparedStatement; import java.sql.Connection; import oracle.jdbc.OraclePreparedStatement; import book.util.JDBCUtil; import book.ch03.Util; class DemoPreparedStatementQuery {
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public static void main(String args[]) { Util.checkProgramUsage( args ); Connection conn = null; try { conn = JDBCUtil.getConnection("scott", "tiger", args[0]); _demoBindingByParameterIndex( conn ); _demoBindingByParameterName( conn ); } catch (SQLException e) { // handle the exception properly - in this case, we just // print the stack trace. JDBCUtil.printException ( e ); } finally { // release the JDBC resources in the finally clause. JDBCUtil.close( conn ); } } // end of main() In the main() method, after getting the JDBC connection, we invoke two methods: demoBindingByParameterIndex(): Demonstrates binding by parameter index demoBindingByParameterName(): Demonstrates binding by parameter name We then close the connection in the finally clause to end the main() method. The method _demoBindingByParameterIndex() starts by declaring required variables and beginning a try catch block (notice the constants declared for column indexes later): /* demo parameter binding by index */ private static void _demoBindingByParameterIndex( Connection conn ) throws SQLException { String stmtString = "select empno, ename, job from emp where job = and hiredate < "; System.out.println( "\nCase 1: bind parameter by index"); System.out.println( "Statement: " + stmtString ); PreparedStatement pstmt = null; ResultSet rset = null; final int JOB_COLUMN_INDEX = 1; final int HIREDATE_COLUMN_INDEX = 2; final int SELECT_CLAUSE_EMPNO_COLUMN_INDEX = 1; final int SELECT_CLAUSE_ENAME_COLUMN_INDEX = 2; final int SELECT_CLAUSE_JOB_COLUMN_INDEX = 3; try {
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Notice how the select statement has for input parameters. The query will get us all employees of a given job title and hire date earlier than a given date. Next, we prepare the statement pstmt = conn.prepareStatement( stmtString ); We then bind the parameters. The first parameter is a string for the job column of the emp table; hence we use the setString() method, passing the constant that defines the job column index value of 1 and the parameter value of CLERK. pstmt.setString(JOB_COLUMN_INDEX, "CLERK" ); For the hiredate column, we pass the current date. The parameter index is the constant HIREDATE_COLUMN_INDEX with the value 2 in this case: pstmt.setDate(HIREDATE_COLUMN_INDEX, new java.sql.Date( new java.util.Date().getTime())); Notice that the date value is of type java.sql.Date, not java.util.Date. We execute the statement next. Since it is a query, we use the executeQuery() method: rset = pstmt.executeQuery(); Finally, we end the method after printing the results of the query and closing the result set and statement: // print the result System.out.println( "printing query results ...\n"); while (rset.next()) { int empNo = rset.getInt ( 1 ); String empName = rset.getString ( 2 ); String empJob = rset.getString ( 3 ); System.out.println( empNo + " " + empName + " " + empJob ); } } finally { // release JDBC-related resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } } Let s look at how we can execute the same query, but this time binding parameters by name. The method _demoBindingByParameterName() begins by declaring variables and starting a try catch block: private static void _demoBindingByParameterName( Connection conn ) throws SQLException { String stmtString = "select empno, ename, job " +
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