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The first parameter to the setXXX() methods is the column number, which starts at 1 for the first column, 2 for the second, and so on The second parameter is the value to be inserted setXXX() methods exist for all data types, as well as two special ones: setObject() and setNull() Type conversions into any JDBC data type can be made with setObject(), which takes a third parameter: pstmtsetObject(int column, Object value, int typeNumber) where typeNumber is an static integer constant defined in javasqlTypes Similarly, setNull() can be used to store the appropriate null type in a parameter: pstmtsetNull(int column, int typeNumber)

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While the primary motivation for using prepared statements is performance, another subtle advantage exists Suppose you want to make a JSP page that can run queries against the LyricNote product database The page includes a form in which a search argument can be entered This argument is extracted from the request parameters and an SQL statement is then constructed on the fly Here is part of the JSP page showing how the SQL is constructed:

ResultSet rs = stmtexecuteQuery( " SELECT itemcode, description" + " FROM products" + " WHERE prodtype = 'SM'" + " AND description like '%" + searchFor + "%'" );

When the JSP page is used to search for works by Stravinsky, it returns the results shown in Figure 13-5 If, however, you search specifically for Stravinsky s L Histoire du Soldat, you get the nasty error screen shown in Figure 13-6

13:

Figure 13-5

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Figure 13-6

What happened The explanation can be found in the error message:

javaxservletServletException javasqlSQLException: SELECT itemcode, description FROM products WHERE prodtype = 'SM' AND description like '%L'Histoire du Soldat%' Don't understand SQL after: "Histoire"

The word L Histoire has an embedded apostrophe, so when the LIKE clause is evaluated, it terminates too soon, viewing '%L' as the operand it is trying to match Whatever follows is parsed as if it were SQL, which causes the error This problem can be avoided by scanning user input for embedded apostrophes and replacing them with a safe alternative, but this is more complicated than it sounds This technique, referred to as escaping characters, varies in different databases and SQL dialects A JDBC-architected way exists to indicate the escape character, but this adds complexity everywhere user input has to be handled A simpler and cleaner way to handle this is to use a PreparedStatement with a substitution parameter The code that needs to be changed is this:

PreparedStatement pstmt = conprepareStatement( " SELECT itemcode, description\n" + " FROM products\n" + " WHERE prodtype = 'SM'\n" + " AND description like " ); pstmtsetString(1, "%" + searchFor + "%"); ResultSet rs = pstmtexecuteQuery();

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The operand of the LIKE clause is now simply a question mark and the search argument is now added dynamically at run time The query now works with any type of input, regardless of its meaning in SQL, as seen in Figure 13-7

A further refinement of PreparedStatement is embodied in javasql CallableStatement This interface is used to invoke stored procedures, if the database supports them6 Oracle, for example, allows procedures to be written in PL/SQL Queries written in Microsoft Access can be invoked through the JDBC-ODBC bridge as stored procedures

13:

Figure 13-7

Like its immediate superinterface PreparedStatement, a CallableStatement is created with an explicit command string that gets precompiled: CallableStatement cstmt = conprepareCall(escapeString); It also uses question marks to indicate substitution parameters The syntax of a stored procedure call used with CallableStatement is as follows: { = call procedureName( , , , )} If there is no return value from the procedure, the = should be omitted Similarly, if there are no input parameters, the ( , , , ) is not used Because CallableStatement extends PreparedStatement, it uses the same methods for setting substitution parameter values:

String sql = "{call myproc( , )}"; CallableStatement cstmt = conprepareCall(sql); cstmtsetString(1, "New York"); cstmtsetDouble(2, "1973"); cstmtexecuteQuery();

If any of the parameters are OUT or INOUT, their types must be registered with CallableStatementregisterOutParameter() before the call is executed Their values can be retrieved with the same getXXX() methods used by PreparedStatement