testjdbc.java

电子通讯录实现网上保存朋友

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Jason
 */
public class TestJDBC {
    public static void main(String[] args) {
        try {
            //1.
            Class.forName("com.mysql.jdbc.Driver");
            //2.
            Connection con = DriverManager.getConnection(
                    "jdbc:mysql://localhost:3306/eabook","root","root");
            //3.
            Statement statement = con.createStatement();
            //4.
            //add
//            String sql = "insert into t_record_type (typename) values('同学')";
//            int result = statement.executeUpdate(sql);
//          //update
//            String sql = "update t_record_type set typename = '同事' where typeid = 3";
//            int result = statement.executeUpdate(sql);
            //delete
//            String sql = "delete from t_record_type where typeid = 3";
//            int result = statement.executeUpdate(sql);

//            if(result == 1){
//                System.out.println("add success");
//                  System.out.println("update success");
//                System.out.println("delete success");
//            }
            //query
            String sql = "select * from t_record_type";
            ResultSet rs = statement.executeQuery(sql);
            while(rs.next()){
                System.out.println("编号：" + rs.getInt("typeid"));
                System.out.println("记录类型：" + rs.getString("typename"));
                System.out.println("******************************");
            }
            if(statement != null){
                statement.close();
            }
            if(con != null){
                System.out.println("OK");
                con.close();
            }
        } catch (SQLException ex) {
            Logger.getLogger(TestJDBC.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(TestJDBC.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}