JDBC练习-update语句
account表 修改记录
public static void main(String[] args) { Connection conn = null; Statement stat = null; try { //1.注册驱动 Class.forName("com.mysql.cj.jdbc.Driver"); //2.获取连接对象 conn = DriverManager.getConnection("jdbc:mysql:///db2", "root", "root"); //3.定义sql语句 String sql = "update account set balance = 1500 where id = 3"; //4.获取执行sql语句的对象Statement stat = conn.createStatement(); //5执行sql语句 int count = stat.executeUpdate(sql); //6.处理结果 System.out.println(count); if (count > 0){ System.out.println("修改成功"); }else { System.out.println("修改失败"); } } catch (ClassNotFoundException e) { throw new RuntimeException(e); } catch (SQLException e) { e.printStackTrace(); }finally { //7.是否资源 if (stat != null){ try { stat.close(); } catch (SQLException e) { e.printStackTrace(); } } if (conn != null){ try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } }
JDBC练习-delete,DDL语句
public static void main(String[] args) { Connection conn = null; Statement state = null; try { //注册驱动 Class.forName("com.mysql.cj.jdbc.Driver"); //获取连接对象 conn = DriverManager.getConnection("jdbc:mysql:///db2", "root", "root"); //定义sql String sql = "delete from account where id = 3"; //获取执行sql对象 state = conn.createStatement(); //执行sql int count = state.executeUpdate(sql); //处理结果 System.out.println(count); if (count > 0 ){ System.out.println("删除成功"); }else { System.out.println("删除失败"); } } catch (ClassNotFoundException e) { throw new RuntimeException(e); } catch (SQLException e) { throw new RuntimeException(e); }finally { //释放资源 if (state != null){ try { state.close(); } catch (SQLException e) { throw new RuntimeException(e); } } if (conn != null){ try { conn.close(); } catch (SQLException e) { throw new RuntimeException(e); } } } }
执行DDL语句:
public static void main(String[] args) { Connection conn = null; Statement state = null; try { //注册驱动 Class.forName("com.mysql.cj.jdbc.Driver"); //获取连接对象 conn = DriverManager.getConnection("jdbc:mysql:///db2", "root", "root"); //定义sql String sql = "create table acc1(id int,name varchar(20))"; //获取执行sql对象 state = conn.createStatement(); //执行sql int count = state.executeUpdate(sql); //处理结果 System.out.println(count); } catch (ClassNotFoundException e) { throw new RuntimeException(e); } catch (SQLException e) { throw new RuntimeException(e); }finally { //释放资源 if (state != null){ try { state.close(); } catch (SQLException e) { throw new RuntimeException(e); } } if (conn != null){ try { conn.close(); } catch (SQLException e) { throw new RuntimeException(e); } } } }
标签:语句,JDBC,RuntimeException,update,state,sql,catch,null,conn From: https://www.cnblogs.com/qihaokuan/p/16809823.html