JDBC事务提交/回滚实例

以下是使用事务教程中描述的提交和回滚的代码示例。

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。

复制并将以下示例代码保存到：CommitAndRollback.java 中，编译并运行如下 -

//STEP 1. Import required packages
// See more detail at http://www.yiibai.com/jdbc/

import java.sql.*;

public class CommitAndRollback {
   // 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;
   Statement stmt = null;
   try{
      //STEP 2: Register JDBC driver
      Class.forName("com.mysql.jdbc.Driver");

      //STEP 3: Open a connection
      System.out.println("Connecting to database...");
      conn = DriverManager.getConnection(DB_URL,USER,PASS);

      //STEP 4: Set auto commit as false.
      conn.setAutoCommit(false);

      //STEP 5: Execute a query to create statment with
      // required arguments for RS example.
      System.out.println("Creating statement...");
      stmt = conn.createStatement(
                           ResultSet.TYPE_SCROLL_INSENSITIVE,
                           ResultSet.CONCUR_UPDATABLE);

      //STEP 6: INSERT a row into Employees table
      System.out.println("Inserting one row....");
      String SQL = "INSERT INTO Employees " +
                    "VALUES (106, 28, 'Curry', 'Stephen')";
      stmt.executeUpdate(SQL);  

      //STEP 7: INSERT one more row into Employees table
      SQL = "INSERT INTO Employees " +
                    "VALUES (107, 32, 'Kobe', 'Bryant')";
      stmt.executeUpdate(SQL);

      //STEP 8: Commit data here.
      System.out.println("Commiting data here....");
      conn.commit();

      //STEP 9: Now list all the available records.
      String sql = "SELECT id, first, last, age FROM Employees";
      ResultSet rs = stmt.executeQuery(sql);
      System.out.println("List result set for reference....");
      printRs(rs);

      //STEP 10: Clean-up environment
      rs.close();
      stmt.close();
      conn.close();
   }catch(SQLException se){
      //Handle errors for JDBC
      se.printStackTrace();
      // If there is an error then rollback the changes.
      System.out.println("Rolling back data here....");
      try{
         if(conn!=null)
            conn.rollback();
      }catch(SQLException se2){
         se2.printStackTrace();
      }//end try

   }catch(Exception e){
      //Handle errors for Class.forName
      e.printStackTrace();
   }finally{
      //finally block used to close resources
      try{
         if(stmt!=null)
            stmt.close();
      }catch