PrepareStatement物件進行批處理的典型步驟順序

https://www.yiibai.com/jdbc/preparestatement-batching-example.html

以下是使用PrepareStatement物件進行批處理的典型步驟順序 -

• 使用佔位符建立SQL語句。
• 使用prepareStatement()方法建立PrepareStatement物件。
• 使用setAutoCommit()將自動提交設定為false。
• 使用addBatch()方法在建立的Statement物件上新增SQL語句到批處理中。
• 在建立的Statement物件上使用executeBatch()方法執行所有SQL語句。
• 最後，使用commit()方法提交所有更改。

此示例程式碼是基於前面章節中完成的環境和資料庫設定編寫的。

以下程式碼片段提供了使用PrepareStatement物件的批量更新示例，將下面程式碼儲存到檔案：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.out