MySQL-JDBC

• 需要導入jar包： mysql-connector-java-5.1.42-bin.jar
  
• JDBC

package work;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Connection;

import java.sql.Statement;

public class database {

     public  static void fun() throws ClassNotFoundException, SQLException{

            System.out.println("****************");

                String driver="com.mysql.jdbc.Driver";

                String url="jdbc:mysql://localhost:3306/javawork";

                String user="sa";

                String password="123456";

                

                Class.forName(driver);

                 Connection conn=DriverManager.getConnection(url, user, password);

                System.out.println(conn);

                Statement str=conn.createStatement();

                String sql="insert into user values('zhangsi','123','[email protected]');";

                str.executeUpdate(sql);

                 str.close();

                conn.close();

            

      }

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

        {

           fun();

        }

}

• JDBCUNIT

package work;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

public class jdbcUnit {

    

    /**

     * 獲得數據庫連接

     * @return

     * @throws SQLException

     * @throws ClassNotFoundException

     */

    public static Connection getConnection() throws SQLException, ClassNotFoundException{

        Class.forName("com.mysql.jdbc.Driver");

        return DriverManager.getConnection("jdbc:mysql://localhost:3306/javawork","zm","123456");

    }

    

    /**

     * 關閉數據庫連接

     * @param resultSet

     * @param statement

     * @param connection

     */

    public static void close(ResultSet resultSet,Statement statement ,Connection connection){

        if(resultSet!=null){

            try {

                resultSet.close();

            } catch (Exception e) {

                e.printStackTrace();

            }finally{

                resultSet=null;

            }

        }

        

        if(statement!=null){

            try {

                statement.close();

            } catch (Exception e) {

                e.printStackTrace();

            }finally{

                statement=null;

            }

        }

        if(connection!=null){

            try {

                connection.close();

            } catch (Exception e) {

                e.printStackTrace();

            }finally{

                connection=null;

            }

        }

        

    }

    

}

• JDBCFUN

package work;

//import java.awt.List;

import java.sql.Connection;

//import java.sql.DriverManager;

import java.sql.ResultSet;

//import java.sql.SQLException;

import java.sql.Statement;

import java.sql.PreparedStatement;

public class jdbcfun {

//    

    

//    public static void main(String[] args) {

//        userbean users=new userbean();

//        users.setName("123");

//        users.setPassword("2");

//        System.out.println(ispassword(users));

//        

//    }

//

    

    public static boolean finduser(String username){

        

        Boolean bool=false;

        PreparedStatement ps=null;

        Connection conn=null;

        Statement str=null;

        ResultSet re=null;

        try{        

         conn= jdbcUnit.getConnection();        

         str=conn.createStatement();

         String sql="select * from user where name=?;";

         ps=(PreparedStatement) conn.prepareStatement(sql);

         ps.setString(1, username);

         re=ps.executeQuery();

         System.out.println(username);

         if(!re.next())

         {

            

             bool=false;

         }

         else

         {

             bool=true;

         }

        }

        catch(Exception e){

            e.printStackTrace();

        }

        finally{

            jdbcUnit.close(re, str, conn);

        }

        

        return bool;

    }

    public static void insert(userbean users) {

        Connection conn=null;

        Statement str=null;

        ResultSet re=null;

        PreparedStatement ps=null;

        

        

        try{

             conn= jdbcUnit.getConnection();

        

         str=conn.createStatement();

         String sql="insert into user (name,password,mail)values(?,?,?);";

         ps=(PreparedStatement) conn.prepareStatement(sql);

         ps.setString(1, users.getName());

         ps.setString(2, users.getPassword());

         ps.setString(3, users.getEmail());

        

         ps.executeUpdate();

         ps.close();

        }

        catch (Exception e)

        {

            e.printStackTrace();

        }

        finally{

            jdbcUnit.close(re, str, conn);

        }

        

    }

     

    public static boolean ispassword(userbean users){

        Boolean bool=false;

        PreparedStatement ps=null;

        Connection conn=null;

        Statement str=null;

        ResultSet re=null;

        try{        

         conn= jdbcUnit.getConnection();        

         str=conn.createStatement();

         String sql="select password from user where name=?;";

         ps=(PreparedStatement) conn.prepareStatement(sql);

         ps.setString(1, users.getName());

         System.out.println( users.getName());

         re=ps.executeQuery();

        

         if(!re.next())

         {

             bool=false;

         }

         else

         {

             re=ps.executeQuery();

             while(re.next()){

                 String password1=re.getString("password");

                 String password2=users.getPassword();

                 if(password1.equals(password2)){

                    

                     bool=true;

                 }

                 else

                 {

                     bool=false;

                 }

             }

            

         }

        

        }

        catch(Exception e){

            e.printStackTrace();

        }

        finally{

            jdbcUnit.close(re, str, conn);

        }

        

        return bool;

    }

    

    

    public static void update(userbean users)

    {

        Connection conn=null;

        Statement str=null;

        ResultSet re=null;

        PreparedStatement ps=null;

        

        try{

             conn= jdbcUnit.getConnection();

        

         str=conn.createStatement();

         String sql="update user set password=? where name=?;";

         ps=(PreparedStatement) conn.prepareStatement(sql);

         ps.setString(2, users.getName());

         ps.setString(1, users.getPassword());

         ps.executeUpdate();

         ps.close();

        }

        catch (Exception e)

        {

            e.printStackTrace();

        }

        finally{

            jdbcUnit.close(re, str, conn);

        }

        

    }

    public static void findall(){

        //List list=null;

        Connection conn=null;

        Statement str=null;

        ResultSet re=null;

        try{

            

         conn= jdbcUnit.getConnection();

         str=conn.createStatement();

         String sql="insert into user values(users.name,users.password,users.email);";

         re=str.executeQuery(sql);

          

         while (re.next()) {   

             System.out.println(re.getString("name"));

                System.out.println(re.getString("password"));

                System.out.println(re.getString("mail"));

          }   

            

         

        }

        catch(Exception e){

            e.printStackTrace();

        }

        finally{

            jdbcUnit.close(re, str, conn);

        }

        

        

        //return list;

        

    }

}