java之jdbc_採用Statement刪除數據

動力節點筆記

 

import java.sql.*;
//採用Statement刪除數據
public class DeleteTest01 {
    public static void main(String[] args) {
        if (args.length != 1) {
            throw new IllegalArgumentException("參數非法，正確使用爲InsertTest01 值");
        }

        Connection conn = null;
        Statement stmt = null;
        try {
            //第一步，加載數據庫驅動，不一樣的數據庫驅動程序不同
            Class.forName("oracle.jdbc.driver.OracleDriver");
            //第二部，獲得數據庫鏈接
            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);

            //取得輸入參數
            int empno = Integer.parseInt(args[0]);

            //第三步，建立Statement，執行SQL語句
            //拼串
            //最好將比較複雜的sql調通，再將sql語句和程序相結合，進行連調
            String sql = "delete from enp where empno = " + empno;

            System.out.println("sql = " + sql);
            stmt = conn.createStatement();
            stmt.executeUpdate(sql);
            System.out.println("刪除員工成功, 員工代碼：【" + empno +"】");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            //注意關閉原則：從裏到外
            try {
                if (stmt != null) {
                    stmt.close();
                }
                if (conn != null) {
                    conn.close();
                }
            } catch(SQLException e) {

            }

        }
    }
}


/*
    注意在pl/sql developer中，修改數據後要commit後，在其餘終端下才能對相應的記錄操做
*/