JDBC练习_insert语句和update语句

JDBC练习_insert语句

    /*
    * account表 添加一条记录 insert语句
    * */
    public static void insert(){
        Connection conn = null;
        Statement stmt = null;
        try {
            //注册驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
            //定义sql
            String sql = "insert into account values(null,'王五',3000)";
            //获取Connection对象
            conn = DriverManager.getConnection("jdbc:mysql:///db2", "root", "root");
            //获取执行sql的对象 Statement
            stmt = conn.createStatement();
            //执行sql
            int count = stmt.executeUpdate(sql);//影响行数
            //6.处理结果
            System.out.println(count);
            if (count > 0){
                System.out.println("添加成功!");
            }else {
                System.out.println("添加失败!");
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            if (stmt!=null){
                try {
                    stmt.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }

            if (conn!=null){
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }

 

 

 

JDBC练习_update语句

    /*
        account表 修改记录
     */
    private static void update() {
        Connection conn = null;
        Statement stat = null;
        try {
            //注册驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
            //获取Connection对象
            conn = DriverManager.getConnection("jdbc:mysql:///db2", "root", "root");
            //定义sql
            String sql = "update account set balance = 1500 where id = 3";
            //获取执行sql的对象 Statement
            stat = conn.createStatement();
            //执行sql
            int i = stat.executeUpdate(sql);
            //处理结果
            System.out.println(i);
            if (i>0){
                System.out.println("修改成功");
            }else {
                System.out.println("修改失败");
            }

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            if (stat!=null){
                try {
                    stat.close();
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
            if (conn!=null){
                try {
                    conn.close();
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
        }
    }

 

 

 

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