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Step 1: Creating a PreparedStatement Object
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You create PreparedStatement objects with a Connection object. You might write code such as the following to create a PreparedStatement object that takes two input parameters: java.sql.Connection conn = null; java.sql.PreparedStatement pstmt = null;
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CHAPTER 12 WORKING WITH THE PREPAREDSTATEMENT
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try { // get a database connection conn = getConnection(); // prepare your SQL insert query String insertStatement = "insert into my_table(id, name) values( , )"; // create PreparedStatement object pstmt = conn.prepareStatement(insertStatement); // at this point your PreparedStatement object is ready // to be used for inserting records into my_table. // insert new records... } catch(Exception e) { // could not create a PreparedStatement object // handle the exception } finally { // cleanup time // close prepared statement and Connection objects }
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Step 2: Supplying Values for PreparedStatement Parameters
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The variable psmt (the PreparedStatement object) now contains the SQL INSERT statement insert into my_table(id, name) values( , ), which has been sent to the DBMS and precompiled. Before you can insert records into the database table (in this case my_table), you need to supply values to be used in place of the question mark placeholders, if there are any, before you can execute a PreparedStatement object. You do this by calling one of the PreparedStatement.setXXX() methods (XXX refers to the data type of columns for a given table). If the value you want to substitute for a question mark is a Java int, you call the method setInt(columnsPosition, integerValue). If the value you want to substitute for a question mark is a Java String, you call the method setString(columnsPosition, columnsStringValue), and so on. The PreparedStatement interface provides a setXXX() method for each type in the Java programming language. The following example shows the revised code that supplies values for placeholders. This shows how to prepare the table my_table: mysql> create table my_table(id int, name varchar(20)); Query OK, 0 rows affected (0.02 sec) mysql> desc my_table; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | id | int(11) | YES | | NULL | | | name | varchar(20) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 2 rows in set (0.00 sec) mysql> mysql> mysql> mysql> insert into my_table(id, name) values(100, 'alex'); insert into my_table(id, name) values(200, 'mary'); commit; select * from my_table;
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CHAPTER 12 WORKING WITH THE PREPAREDSTATEMENT
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+------+------+ | id | name | +------+------+ | 100 | alex | | 200 | mary | +------+------+ 2 rows in set (0.00 sec) Using the PreparedStatement object pstmt from the previous example, the following code sets the first question mark placeholder to a Java int with a value of 300 and the second question mark placeholder to a Java String with value of "joe": pstmt.setInt(1, 300); pstmt.setString(2, "joe"); After you have set these values for the two input parameters, the SQL statement in pstmt will be equivalent to the SQL statement in the String object insertStatement that was used in the previous update example. Therefore, the next code fragment: String insertStatement = "insert into my_table(id, name) values(300, 'joe')"; pstmt = conn.prepareStatement(insertStatement); pstmt.executeUpdate(); accomplishes the same thing as the following one (note that the method PreparedStatement. executeUpdate() executes the PreparedStatement pstmt object): String insertStatement = "insert into my_table(id, name) values( , )"; pstmt = conn.prepareStatement(insertStatement); pstmt.setInt(1, 300); pstmt.setString(2, "joe"); pstmt.executeUpdate():
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Step 3: Executing the PreparedStatement Object
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If your SQL statement is SELECT, then you use executeQuery(), which returns a ResultSet object. However, if your SQL statement is INSERT, UPDATE, or DELETE, then you use executeUpdate(), which returns an integer. (This number indicates how many rows were affected by your update statement.)
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12-23. How Do You Insert a New Record into a Table Using PreparedStatement
The following sections show how to insert a new record into an existing table using a PreparedStatement object.
How It Works
The following example creates a PreparedStatement object to insert a new record into the dept table. You can use a SQL INSERT statement to insert a new record into an existing dept table.
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