java之jdbc_采用Statement删除数据

动力节点笔记

 

import java.sql.*;
//采用Statement删除数据
public class DeleteTest01 {
    public static void main(String[] args) {
        if (args.length != 1) {
            throw new IllegalArgumentException("参数非法，正确使用为InsertTest01 值");
        }

        Connection conn = null;
        Statement stmt = null;
        try {
            //第一步，加载数据库驱动，不一样的数据库驱动程序不同
            Class.forName("oracle.jdbc.driver.OracleDriver");
            //第二部，获得数据库链接
            String dburl = "jdbc:oracle:thin:@localhost:1521:orcl";
            //String dburl = "jdbc:oracle:thin:@192.168.21.1:1521:orcl";
            //String dburl = "jdbc:oracle:thin:@127.0.0.1:1521:orcl";
            String userName = "system";
            String password = "wanwan";
            conn = DriverManager.getConnection(dburl, userName, password);
            //System.out.println(conn);

            //取得输入参数
            int empno = Integer.parseInt(args[0]);

            //第三步，建立Statement，执行SQL语句
            //拼串
            //最好将比较复杂的sql调通，再将sql语句和程序相结合，进行连调
            String sql = "delete from enp where empno = " + empno;

            System.out.println("sql = " + sql);
            stmt = conn.createStatement();
            stmt.executeUpdate(sql);
            System.out.println("删除员工成功, 员工代码：【" + empno +"】");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            //注意关闭原则：从里到外
            try {
                if (stmt != null) {
                    stmt.close();
                }
                if (conn != null) {
                    conn.close();
                }
            } catch(SQLException e) {

            }

        }
    }
}


/*
    注意在pl/sql developer中，修改数据后要commit后，在其余终端下才能对相应的记录操做
*/