PrepareStatement对象进行批处理的典型步骤顺序
https://www.yiibai.com/jdbc/preparestatement-batching-example.html
以下是使用PrepareStatement对象进行批处理的典型步骤顺序 -
- 使用占位符创建SQL语句。
- 使用
prepareStatement()方法创建PrepareStatement对象。 - 使用
setAutoCommit()将自动提交设置为false。 - 使用
addBatch()方法在创建的Statement对象上添加SQL语句到批处理中。 - 在创建的
Statement对象上使用executeBatch()方法执行所有SQL语句。 - 最后，使用
commit()方法提交所有更改。
此示例代码是基于前面章节中完成的环境和数据库设置编写的。
以下代码片段提供了使用PrepareStatement对象的批量更新示例，将下面代码保存到文件：BatchingWithPrepareStatement.java -
// Import required packages
// See more detail at http://www.yiibai.com/jdbc/
import java.sql.*;
public class BatchingWithPrepareStatement {
// JDBC driver name and database URL
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost/EMP";
// Database credentials
static final String USER = "root";
static final String PASS = "123456";
public static void main(String[] args) {
Connection conn = null;
PreparedStatement stmt = null;
try{
// Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
// Open a connection
System.out.println("Connecting to database...");
conn = DriverManager.getConnection(DB_URL,USER,PASS);
// Create SQL statement
String SQL = "INSERT INTO Employees(id,first,last,age) " +
"VALUES(?, ?, ?, ?)";
// Create preparedStatemen
System.out.println("Creating statement...");
stmt = conn.prepareStatement(SQL);
// Set auto-commit to false
conn.setAutoCommit(false);
// First, let us select all the records and display them.
printRows( stmt );
// Set the variables
stmt.setInt( 1, 400 );
stmt.setString( 2, "Python" );
stmt.setString( 3, "Zhang" );
stmt.setInt( 4, 33 );
// Add it to the batch
stmt.addBatch();
// Set the variables
stmt.setInt( 1, 401 );
stmt.setString( 2, "C++" );
stmt.setString( 3, "Huang" );
stmt.setInt( 4, 31 );
// Add it to the batch
stmt.addBatch();
// Create an int[] to hold returned values
int[] count = stmt.executeBatch();
//Explicitly commit statements to apply changes
conn.commit();
// Again, let us select all the records and display them.
printRows( stmt );
// Clean-up environment
stmt.close();
conn.close();
}catch(SQLException se){
//Handle errors for JDBC
se.printStackTrace();
}catch(Exception e){
//Handle errors for Class.forName
e.printStackTrace();
}finally{
//finally block used to close resources
try{
if(stmt!=null)
stmt.close();
}catch(SQLException se2){
}// nothing we can do
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
se.printStackTrace();
}//end finally try
}//end try
System.out.println("Goodbye!");
}//end main
public static void printRows(Statement stmt) throws SQLException{
System.