jdbc实现事务相关

大致的实现思路（SQL语句不支持try-catch）：

try {
	set autocommit =0; //在事务结束之前的所有DML处于同一个事务中。
	update account set money=money-100 where card_id='1234567890';
	update account set money=moy-100 where card_id='0515151515'
	commit; //提交事务，将DML语句执行结果持久化到磁盘。
}catch() {
	rollback;
    }

java代码完善：

package jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class Text {

	public static void main(String[] args) {
		Connection connection = null;
		Statement statement=null;
		
		try {
			Class.forName("com.mysql.jdbc.Driver");
			connection = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test", "root","root");//2,建立连接
			connection.setAutoCommit(false);
			statement= connection.createStatement();
			statement.addBatch("update account set money=money-100 where card_id= '1234567890'");
			statement.addBatch("update account set money=money+100 where card_id= '0987654321'");
			statement.executeBatch();
			connection.commit();
		} catch (Exception e) {			
			try {
				if (connection!=null) {
					connection.rollback();
				}
			} catch (SQLException e1) {
				e1.printStackTrace();
			}
		}finally {
			try {
				if (statement!=null) {
					statement.close();
				}
			} catch (SQLException e) {
				e.printStackTrace();
			}
			try {
				if (connection!=null) {
					connection.close();
				}
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}	
	}
}

此时执行结果

思考：如果此时sql语句部分出错

package jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class Text {

	public static void main(String[] args) {
		Connection connection = null;
		Statement statement=null;
		
		try {
			Class.forName("com.mysql.jdbc.Driver");
			connection = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test", "root","root");//2,建立连接
			connection.setAutoCommit(false);
			statement= connection.createStatement();
			statement.addBatch("update account set money=money-100 where card_id= '1234567890'");
			statement.addBatch("update account set mon=money+100 where card_id= '0987654321'");//出错的部分
			statement.executeBatch();
			connection.commit();
		} catch (Exception e) {			
			try {
				if (connection!=null) {
					connection.rollback();
				}
			} catch (SQLException e1) {
				e1.printStackTrace();
			}
		}finally {
			try {
				if (statement!=null) {
					statement.close();
				}
			} catch (SQLException e) {
				e.printStackTrace();
			}
			try {
				if (connection!=null) {
					connection.close();
				}
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}	
	}
}

控制台输出结果：

数据库输出结果

分析：由于其中一条SQL语句出错，则会被catch语句捕捉，输出对应异常信息，事务执行回滚，导致SQL语句对应的操作，上述输出结果则印证了这一点。