标签：prepare statement 自动 ini 提交 mysql balance lock 保存
直接上下代码：
1 package com.learn.jdbc.chap09; 2 3 import java.sql.Connection; 4 import java.sql.PreparedStatement; 5 import java.sql.SQLException; 6 7 import com.learn.jdbc.util.DbUtil; 8 9 /** 10 * JDBC事务处理-----转账实例 11 * @author Administrator 12 * 13 */ 14 public class Demo1 { 15 private static DbUtil dbUtil=new DbUtil(); 16 17 /** 18 * 转出 19 * @param con 20 * @param accountName 21 * @param amount 22 * @throws Exception 23 */ 24 private static void outAccount(Connection con,String accountName,Double amount) throws Exception{ 25 String sql="update sp_account set accountBalance=accountBalance-? where accountName=?"; 26 PreparedStatement pstmt = con.prepareStatement(sql); 27 pstmt.setDouble(1, amount); 28 pstmt.setString(2, accountName); 29 pstmt.executeUpdate(); 30 31 } 32 33 /** 34 * 转入 35 * @param con 36 * @param accountName 37 * @param amount 38 * @throws Exception 39 */ 40 private static void inAccount(Connection con,String accountName,Double amount) throws Exception{ 41 String sql="update sp_account set accountBalance=accountBalance+? where accountName=?"; 42 PreparedStatement pstmt = con.prepareStatement(sql); 43 pstmt.setDouble(1, amount); 44 pstmt.setString(2, accountName); 45 pstmt.executeUpdate(); 46 47 } 48 49 public static void main(String[] args) { 50 Connection con=null; 51 52 try { 53 con = dbUtil.getCon(); 54 System.out.println("张三向李四转账"); 55 Double amount=500.00; 56 outAccount(con,"张三",amount); 57 inAccount(con,"李四",amount); 58 System.out.println("转帐成功！"); 59 } catch (Exception e) { 60 // TODO Auto-generated catch block 61 e.printStackTrace(); 62 }finally{ 63 try { 64 con.close(); 65 } catch (SQLException e) { 66 // TODO Auto-generated catch block 67 e.printStackTrace(); 68 } 69 } 70 71 72 73 74 75 76 } 77 }
1 package com.learn.jdbc.chap09; 2 3 import java.sql.Connection; 4 import java.sql.PreparedStatement; 5 import java.sql.SQLException; 6 7 import com.learn.jdbc.util.DbUtil; 8 9 /** 10 * JDBC事务处理---转账失败，使用事务机制进行回滚 11 * @author Administrator 12 * 13 */ 14 public class Demo2 { 15 private static DbUtil dbUtil=new DbUtil(); 16 17 /** 18 * 转出 19 * @param con 20 * @param accountName 21 * @param amount 22 * @throws Exception 23 */ 24 private static void outAccount(Connection con,String accountName,Double amount) throws Exception{ 25 String sql="update sp_account set accountBalance=accountBalance-? where accountName=?"; 26 PreparedStatement pstmt = con.prepareStatement(sql); 27 pstmt.setDouble(1, amount); 28 pstmt.setString(2, accountName); 29 pstmt.executeUpdate(); 30 31 } 32 33 /** 34 * 转入 35 * @param con 36 * @param accountName 37 * @param amount 38 * @throws Exception 39 */ 40 private static void inAccount(Connection con,String accountName,Double amount) throws Exception{ 41 String sql="update sp_account set accountBalance1=accountBalance+? where accountName=?"; 42 PreparedStatement pstmt = con.prepareStatement(sql); 43 pstmt.setDouble(1, amount); 44 pstmt.setString(2, accountName); 45 pstmt.executeUpdate(); 46 47 } 48 49 public static void main(String[] args) { 50 Connection con=null; 51 52 try { 53 con = dbUtil.getCon(); 54 con.setAutoCommit(false); // 1. 取消自动提交--事务开始 55 System.out.println("张三向李四转账"); 56 Double amount=500.00; 57 outAccount(con,"张三",amount); 58 inAccount(con,"李四",amount); 59 System.out.println("转帐成功！"); 60 } catch (Exception e) { 61 // TODO Auto-generated catch block 62 try { 63 con.rollback(); // 2. 回滚--事务回滚 64 System.out.println("事务回滚！"); 65 } catch (SQLException e1) { 66 // TODO Auto-generated catch block 67 e1.printStackTrace(); 68 } 69 e.printStackTrace(); 70 }finally{ 71 try { 72 con.commit(); // 3. 提交事务---事务结束 73 System.out.println("提交事务！"); // 注意：mysql的MyISAM模式不支持事务机制，要用事务，就用InnoDB 74 con.close(); 75 } catch (SQLException e) { 76 // TODO Auto-generated catch block 77 e.printStackTrace(); 78 } 79 } 80 81 82 83 84 85 86 } 87 }
1 package com.learn.jdbc.chap09; 2 3 import java.sql.Connection; 4 import java.sql.PreparedStatement; 5 import java.sql.SQLException; 6 import java.sql.Savepoint; 7 8 import com.learn.jdbc.util.DbUtil; 9 10 /** 11 * JDBC事务处理---转账失败，使用事务机制进行回滚--设置事务保存点（注意：工作中不怎么使用保存点） 12 * @author Administrator 13 * 14 */ 15 public class Demo3 { 16 private static DbUtil dbUtil=new DbUtil(); 17 18 /** 19 * 转出 20 * @param con 21 * @param accountName 22 * @param amount 23 * @throws Exception 24 */ 25 private static void outAccount(Connection con,String accountName,Double amount) throws Exception{ 26 String sql="update sp_account set accountBalance=accountBalance-? where accountName=?"; 27 PreparedStatement pstmt = con.prepareStatement(sql); 28 pstmt.setDouble(1, amount); 29 pstmt.setString(2, accountName); 30 pstmt.executeUpdate(); 31 32 } 33 34 /** 35 * 转入 36 * @param con 37 * @param accountName 38 * @param amount 39 * @throws Exception 40 */ 41 private static void inAccount(Connection con,String accountName,Double amount) throws Exception{ 42 String sql="update sp_account set accountBalance1=accountBalance+? where accountName=?"; 43 PreparedStatement pstmt = con.prepareStatement(sql); 44 pstmt.setDouble(1, amount); 45 pstmt.setString(2, accountName); 46 pstmt.executeUpdate(); 47 48 } 49 50 public static void main(String[] args) { 51 Connection con=null; 52 Savepoint sp=null; 53 54 try { 55 con = dbUtil.getCon(); 56 con.setAutoCommit(false); // 1. 取消自动提交--事务开始 57 System.out.println("张三向李四转账"); 58 Double amount=500.00; 59 outAccount(con,"张三",amount); 60 sp=con.setSavepoint(); // 2. 设置一个保存点 61 inAccount(con,"李四",amount); 62 System.out.println("转帐成功！"); 63 } catch (Exception e) { 64 // TODO Auto-generated catch block 65 try { 66 con.rollback(sp); // 3. 回滚--事务回滚到保存点 67 System.out.println("事务回滚！"); 68 } catch (SQLException e1) { 69 // TODO Auto-generated catch block 70 e1.printStackTrace(); 71 } 72 e.printStackTrace(); 73 }finally{ 74 try { 75 con.commit(); // 4. 提交事务---事务结束 76 System.out.println("提交事务！"); // 注意：mysql的MyISAM模式不支持事务机制，要用事务，就用InnoDB 77 con.close(); 78 } catch (SQLException e) { 79 // TODO Auto-generated catch block 80 e.printStackTrace(); 81 } 82 } 83 84 85 86 87 88 89 } 90 }
标签：prepare statement 自动 ini 提交 mysql balance lock 保存
原文地址：http://www.cnblogs.com/eaglezb/p/6055352.html
