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Using Prepared Statements in JDBC
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The executeQuery() and executeUpdate() methods of the Statement object provide a dynamic SQL capability. They parallel the SQLExecDirect() call in the CLI standard. The database on the other end of the JDBC connection doesn t know in advance which SQL text will be presented when the execute method is called. It must parse the statement on the fly and determine how to execute it. The dynamic SQL approach makes this part of the JDBC interface quite easy to use, but it creates the high overhead usually associated with dynamic SQL for the underlying DBMS. For high transaction rate applications where performance is important, an alternative prepared statement interface is more appropriate. The prepared statement approach uses the same concepts as the PREPARE / EXECUTE statements of embedded dynamic SQL and the SQLPrepare() and SQLExecute() calls of the CLI standard. A SQL statement that is to be executed repeatedly (such as an UPDATE statement that will be used on many rows or a query that will be executed hundreds of times during a program) is first prepared by passing it to the DBMS for parsing and analysis. Later, the statement may be executed repeatedly with very little overhead. You can vary the specific values used by the statement during each execution by passing parameter values for the execution. For example, you can change the values to be used for each UPDATE operation, or change the value to be matched in the WHERE clause of a query using parameters. To use a prepared statement with JDBC, your program invokes the prepareStatement() method on a connection instead of the createStatement() method. Unlike createStatement(), the prepareStatement() method takes an argument a string containing the SQL statement that is to be prepared. Within the statement string, parameters to be supplied at statement execution are indicated by a question mark ( ), which serves as a parameter marker. A parameter can be used within the statement anywhere that a constant could legally appear in the statement. The prepareStatement() method returns a PreparedStatement object, which includes some additional methods beyond those provided by a Statement object. Table 19-18 shows some of these additional methods, nearly all of which are for parameter processing. The additional set() methods of the PreparedStatement object take two parameters. One indicates the parameter number for which a value is being supplied.
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setInt() setShort() setLong() setFloat() setDouble() setString() setBoolean() setDate() setTime() setTimeStamp() setByte() setBytes() setBigDecimal() setNull() setObject() ClearParameters getParameterMetaData()
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Sets value of an integer parameter Sets value of a short integer parameter Sets value of a long integer parameter Sets value of a floating point parameter Sets value of a double-precision floating point parameter Sets value of a string parameter Sets value of a BOOLEAN parameter Sets value of a DATE parameter Sets value of a TIME parameter Sets value of a TIMESTAMP parameter Sets value of a BYTE parameter Sets value of a BINARY or VARBINARY parameter Sets value of a DECIMAL or NUMERIC parameter Sets a NULL value for a parameter Sets value of an arbitrary parameter Clears all parameter values Returns ParameterMetaData object for a prepared statement (JDBC 3.0 only)
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Table 19-18.
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Additional Methods of a JDBC PreparedStatement Object
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The other provides the parameter value itself. With these methods, the typical sequence for JDBC prepared statement processing can be summarized as follows: 1. The Java program establishes a connection to the DBMS in the usual way. 2. The program calls the prepareStatement() method with the text of the statement to be prepared, including parameter markers. The DBMS analyzes the statement and creates an internal, optimized representation of the statement to be executed. 3. Later, when it s time to execute the parameter statement, the program calls one of the set methods in Figure 19-18 for each parameter, supplying a value for the parameter.
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