JDBC編程-事務編程（四）

檢查發現只是插入user表的數據，沒有插入address表數據，造成數據不完整。

事務處理的應用

事務處理的核心代碼就是
conn.setAutoCommit(false);
在執行完之後的提交。
conn.commit();
以及在捕獲異常時候的回滾。
具體代碼如下：

public static Connection getConnection(){
        Connection conn = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/jsp_dbb", "root", "");
        } catch (Exception e) {
            // TODO: handle exception
        }
        return conn;
    }
    public static void insertUserData(Connection conn)throws SQLException{
            String sql = "INSERT INTO tbl_user(id,name,password,email)" +
                    "VALUES(10,'Tom','123456','[email protected]')";
            Statement st = (Statement) conn.createStatement();
            int count = st.executeUpdate(sql);
            System.out.println("插入了"+count+"行用戶數據");
    }
    public static void insertAddressData(Connection conn) throws SQLException{
            String sql = "INSERT INTO tbl_address(id,city,country,user_id)" +
                    "VALUES(1,'shanghai','china,'10')";
            Statement st = (Statement) conn.createStatement();
            int count = st.executeUpdate(sql);
            System.out.println("插入了"+count+"行地址數據");
    }
    public static void main(String[] args) {
        Connection conn = null;
        try {
            conn = getConnection();
            conn.setAutoCommit(false);
            insertUserData(conn);
            insertAddressData(conn);
            conn.commit();
        } catch (SQLException e) {
            System.out.println("==========捕獲SQL異常=========");
            e.printStackTrace();
            try {
                conn.rollback();
                System.out.println("=======s事務回滾成功=======");
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }finally{
            try {
                if (conn != null) {
                    conn.close();
                }
            } catch (Exception e3) {
                e3.printStackTrace();
            }
        }
    }

插入了1行用戶數據
==========捕獲SQL異常=========
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '10')' at line 1
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
    at com.mysql.jdbc.Util.getInstance(Util.java:360)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:978)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2526)
    at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1618)
    at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1549)
    at liu.peng.jdbc.TransactionTest.insertAddressData(TransactionTest.java:31)
    at liu.peng.jdbc.TransactionTest.main(TransactionTest.java:40)
=======s事務回滾成功=======