Use Java query

package cn.jbit.epetShop.dao;

import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

import cn.jbit.epetShop.dao.BaseDao;


public class BaseDao {
    public static String DRIVER; 
    public static String URL ; 
    public static String DBNAME;
    public static String DBPASS; 
    Connection conn = null;
    static{
        init();
    }
        public static voidthe init () { 
            the Properties the params = new new the Properties (); 
            String the configFile = " the database.properties " ; // profile path
             // load configuration file input stream into 
            the InputStream IS = BaseDao. class .getClassLoader () the getResourceAsStream (the configFile). ;
             the try {
                 // read from the input stream property list 7 in 
                the params .load ( IS ); 
            } the catch (IOException E) { 
                e.printStackTrace (); 
            } 
            //Get the specified value corresponding to 
            the DRIVER = the params .getProperty ( " Driver " ); 
            the URL = the params .getProperty ( " URL " ); 
            DBNAME = the params .getProperty ( " User " ); 
            DBPASS in = the params .getProperty ( " password " ) ; 
        }    
        // database connection 
    public connection getConn () throws a ClassNotFoundException, SQLException { 
        connection Conn = null;
        try {
            Class.forName(DRIVER); 
            conn = DriverManager.getConnection(URL, DBNAME, DBPASS);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn; 
    }

    public void closeAll(Connection conn, PreparedStatement pstmt, ResultSet rs) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (pstmt != null) {
            try {
                pstmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

    }

    public int executeSQL(String preparedSql, Object[] param) {
        Connection conn = null ;
        PreparedStatement pstmt = null ;
         int NUM = 0 ; 

        / * process SQL, execute the SQL * / 
        the try { 
            Conn = getConn (); // get the database connection 
            pstmt = conn.prepareStatement (preparedSql); // get PreparedStatement object 
            IF (param ! = null ) {
                 for ( int I = 0 ; I <param.length; I ++ ) { 
                    pstmt.setObject (I + . 1 , param [I]); // precompiled sql setting parameters
                } 
            } 
            // System.out.println (preparedSql); 
            NUM = pstmt.executeUpdate (); // execute SQL statements 
        } the catch (ClassNotFoundException E) { 
            e.printStackTrace (); // process a ClassNotFoundException 
        } the catch (SQLException E) { 
            e.printStackTrace (); // process exception SQLException 
        } the finally {
             the this .closeAll (Conn, pstmt, null ); 
        } 
        
        return NUM; 
    
}

1 driver=com.mysql.jdbc.Driver
2 url=jdbc:mysql://localhost:3306/petShop
3 user=root
4 password=

com.myschool.entity Package; 
 
Import the java.io.Serializable; 
Import java.util.Date; 
 
public  class Student the implements the Serializable { 
     
    Private  static Final Long serialVersionUID = 6439763802252472361L ; 
     
    // define entity attributes 
    Private  int studentNo;
     Private String longinPwd;
     Private String studentName;
     Private  int Sex;
     Private Grade Grade; // the year as a property of the object 
    Private String Phone;
     Private String address;
     Private Date bornDate;
    private String email;
    private String identityCard;
     
        //封装
    public int getStudentNo() {
        return studentNo;
    }
    public void setStudentNo(int studentNo) {
        this.studentNo = studentNo;
    }
    public String getLonginPwd() {
        return longinPwd;
    }
    public void setLonginPwd(String longinPwd) {
        this.longinPwd = longinPwd;
    }
    public String getStudentName() {
        return studentName;
    }
    public void setStudentName(String studentName) {
        this.studentName = studentName;
    }
    public int getSex() {
        return sex;
    }
    public void setSex(int sex) {
        this.sex = sex;
    }
    public grade getGrade() {
        return grade;
    }
    public void setGrade(grade grades) {
        this.grade = grades;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public Date getBornDate() {
        return bornDate;
    }
    public void setBornDate(Date bornDate) {
        this.bornDate = bornDate;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getIdentityCard() {
        return identityCard;
    }
    public void setIdentityCard(String identityCard) {
        this.identityCard = identityCard;
    }
     
       //有参构造
    public Student(int studentNo, String longinPwd, String studentName,
            int sex, grade gradeID, String phone, String address, Date bornDate,
            String email, String identityCard) {
        this.studentNo = studentNo;
        this.longinPwd = longinPwd;
        this.studentName = studentName;
        this.sex = sex;
        this.gradeID = gradeID;
        this.phone = phone;
        this.address = address;
        this.bornDate = bornDate;
        this.email = email;
        this.identityCard = identityCard;
    } 
 
    //Constructor with no arguments 
    public Student () {
         
    

package com.myschool.entity;

public class grade {
    private int gradeid;
    private String gradeName;
    public int getGradeid() {
        return gradeid;
    }
    public void setGradeid(int gradeid) {
        this.gradeid = gradeid;
    }
    public String getGradeName() {
        return gradeName;
    }
    public void setGradeName(String gradeName) {
        this.gradeName = gradeName;
    }
    public grade(int gradeid, String gradeName) {
        super();
        this.gradeid = gradeid;
        this.gradeName = gradeName;
    }
    public grade() {
        super();
        
    }
    
}

package com.myschool.dao;

import java.util.List;

import com.myschool.entity.Student;

public interface IStudentDao {

    /*
     * 查询所有学生记录,年级名称
     */
    public List<Student> Search() throws Exception;

    
}




package com.mychool.dao.impl;

import java.sql.ResultSet;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import com.myschool.dao.IStudentDao;
import com.myschool.dao.baseDao;
import com.myschool.entity.Student;
import com.myschool.entity.grade;

public classThe extends BaseDao the implements IStudentDao {IStudentDaoImpl 

    
    @Override 
    public List <Student> Search () throws Exception {
         // create a collection of generic objects student 
        List <Student> = stus new new the ArrayList <Student> (); 
        
        String SQL = " the Select studentName, from GradeName Student, Grade WHERE Grade.gradeid = Student.gradeid " ; 

        // definition of the object receiving basedao resultSet check out the data query method 
        the resultSet = rSet the executeQuery (SQL); 
        
        IF (! rSet = null ) {
             the while (rSet.next () ) { 
                Student STU = new newStudent (); 
                Grade Grade = new new Grade (); // create an object grades; 
                grade.setGradeName (rSet.getString ( " gradeName " )); // to assign grades Object 
                stu.setStudentName (rSet.getString ( " studentName " ) ); // give students an assignment objects 
                stu.setGradeID (Grade); 
                stus.add (STU); // add students to object to the object in the collection 
            } 
            
        } 
　　　　// recycling release resources 
        closeResouse ();
         return stus; 
    } 

    
}

1.service接口：

package com.myschool.service;

import java.util.List;

import com.myschool.entity.Student;

public interface IService {
    
    public List<Student> Search() throws Exception;
}

　　　　2.service接口实现类：

package com.mychool.service.Impl;

import java.util.List;

import com.mychool.dao.impl.IStudentDaoImpl;
import com.myschool.dao.IStudentDao;
import com.myschool.entity.Student;
import com.myschool.service.IService;

public class IServiceImpl implements IService{

    IStudentDao isd=new IStudentDaoImpl();
    @Override
    public List<Student> Search() throws Exception {
        return isd.Search();
    }
    
}