MySql教程

NoSql实验(一) MySQL数据库操作

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Name

English

Math

Computer

zhangsan

69

86

77

lisi

55

100

88

根据上面给出的Student表,在MySQL数据库中完成如下操作:

(1)    在MySQL中创建Student表,并录入数据;

CREATE TABLE `student` (

  `id` int(11) NOT NULL,

  `name` varchar(45) COLLATE utf8_bin NOT NULL,

  `english` varchar(45) COLLATE utf8_bin NOT NULL,

  `math` varchar(45) COLLATE utf8_bin NOT NULL,

  `computer` varchar(45) COLLATE utf8_bin NOT NULL,

  PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin

(2)    用SQL语句输出Student表中的所有记录;

SELECT * FROM test_nosql.student;

 

(3)    查询zhangsan的Computer成绩;

SELECT computer FROM test_nosql.student where name_='zhangsan';

 

(4)修改lisi的Math成绩,改为95。

 update test_nosql.student  set math='95' where name_='lisi';

 

根据上面已经设计出的Student表,使用MySQL的JAVA客户端编程实现以下操作:

(1)向Student表中添加如下所示的一条记录:

scofield

45

89

100

      

(2)获取scofield的English成绩信息

 

package utils;



import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;



import com.mchange.v2.c3p0.ComboPooledDataSource;



public class JDBCTools {

   private static ComboPooledDataSource cpds;

   static {

      cpds=new ComboPooledDataSource("testc3p0");

   }

   public static Connection getConnection() throws SQLException

   {

      Connection conn=null;

      conn= cpds.getConnection();

      return conn;

   }

   public static void release(Connection conn,PreparedStatement ps,ResultSet rs)

   {

      try{

         if(conn!=null)

         {

            conn.close();

         }

         if(ps!=null)

         {

            ps.close();

         }

         if(rs!=null)

         {

            rs.close();

         }

      }catch(SQLException e)

      {

         e.printStackTrace();

      }  

   }

   public static void main(String[] args) throws SQLException{

      System.out.println(JDBCTools.getConnection());

   }



}

 

package Dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;

import utils.JDBCTools;

public class BaseDao {
   private QueryRunner qr=new QueryRunner();
   private Connection conn=null;
   private PreparedStatement ps=null;
   private ResultSet rs=null;
   //更新,删除,插入
  
public int upDate(String sql,Object ... args)
   {
      try {
         conn=JDBCTools.getConnection();
         return qr.update(conn,sql,args);
      } catch (SQLException e) {
         // TODO Auto-generated catch block
        
e.printStackTrace();
      }finally{
         JDBCTools.release(conn, ps, rs);
      }
      return -1;
   }
   //查询单个数据
  
public <T>T queryForOne(Class<T> type,String sql,Object ... args)
   {
      try {
         conn=JDBCTools.getConnection();
         return qr.query(conn,sql,new BeanHandler<T>(type),args);
      } catch (SQLException e) {
         // TODO Auto-generated catch block
        
e.printStackTrace();
      }finally{
         JDBCTools.release(conn, ps, rs);
      }
      return null;
   }
   //查询list数据
  
public <T>List<T> queryForList(Class<T> type,String sql,Object ... args)
   {
      try {
         conn=JDBCTools.getConnection();
         return qr.query(conn,sql,new BeanListHandler<T>(type),args);
      } catch (SQLException e) {
         // TODO Auto-generated catch block
        
e.printStackTrace();
      }finally{
         JDBCTools.release(conn, ps, rs);
      }
      return null;
   }
   //将单个之封装如count*
  
public Object queryForSingleValue(String sql,Object...args)
   {
      try {
         conn=JDBCTools.getConnection();
         return qr.query(conn,sql,new ScalarHandler(),args);
      } catch (SQLException e) {
         // TODO Auto-generated catch block
        
e.printStackTrace();
      }
      return null;
   }
}

package test;



import Dao.BaseDao;

import Data.ArticleData;



public class test_student_dao extends BaseDao {

    public int qrInsert(String name_,String english ,String math,String computer )

    {

        String sql="INSERT INTO student(name_,english,math,computer) values(?,?,?,?)";

        return upDate(sql,name_,english,math,computer);

    }

    public test_student qrFindOne()

    {

        String sql="select english from student where name_='scofield'";

        return queryForOne(test_student.class,sql);

    }

    public static void main(String arg[]){

            test_student_dao test=new test_student_dao();

            test.qrInsert("scofield","45","89","100");

            test_student student=new test_student();

            student=test.qrFindOne();

            System.out.printf("英语成绩:"+student.getEnglish());



    }

}

 

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