package com.csdn.dao;

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

/**
* 單例模式
*
* @author Administrator
*
*/
public class ConfigManager {
// 1.建立私有屬性
private static ConfigManager configManager;
private static Properties properties;

// 2.建立私有構造器
private ConfigManager() {
    // 3.獲取配置檔案
    properties = new Properties();
    InputStream is = ConfigManager.class.getClassLoader()
            .getResourceAsStream("database.properties");
    try {
        properties.load(is);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

// 4.公有的方法（雙重鎖）
public static synchronized ConfigManager getConfigManager() {
    if (configManager == null) {
        synchronized (ConfigManager.class) {
            configManager = new ConfigManager();
        }
    }
    return configManager;
}
//5.拿到鍵值
public String getValues(String key){
    return properties.getProperty(key);
}
 

}

package com.bdqn.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
* 基類
* @author Administrator
*
*/
public class BaseDao {
public Connection connection=null;
public PreparedStatement ps=null;
//獲取資源
public Connection getConnection(){
String driver = ConfigManager.getConfigManager().getValues(“driver”);
String url = ConfigManager.getConfigManager().getValues(“url”);
String user = ConfigManager.getConfigManager().getValues(“user”);
String pwd = ConfigManager.getConfigManager().getValues(“pwd”);
try {
Class.forName(driver);
connection = DriverManager.getConnection(url, user, pwd);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return connection;
}

//關閉資源
public void close(Connection connection,Statement st,ResultSet rs){
    try {
        if (rs != null) {
            rs.close();
        }
        if (st != null) {
            st.close();
        }
        if (connection !=null) {
            connection.close();
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

//增刪改
public int mySql(String sql,Object[] objs){
    int num=0;
    try {
        connection = getConnection();
        ps = connection.prepareStatement(sql);
        if (objs !=null && objs.length>0) {
            for (int i = 0; i < objs.length; i++) {
                ps.setObject((i+1), objs[i]);
            }
        }
        num = ps.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }finally{
        this.close(connection, ps, null);
    }
    return num;
}

//查詢
public ResultSet getResultSet(String sql,Object[] objs){
    ResultSet rs = null;
    try {
        connection = getConnection();
        ps = connection.prepareStatement(sql);
        if (objs != null && objs.length>0) {
            for (int i = 0; i < objs.length; i++) {
                ps.setObject((i+1), objs[i]);
            }
        }
        rs = ps.executeQuery();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return rs;
}
 

}

package com.bdqn.util;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.bdqn.dao.BaseDao;
import com.bdqn.entity.Grade;
import com.bdqn.entity.Student;
import com.bdqn.entity.TableImlp;

public class Table extends BaseDao implements TableImlp {

@Override
public int insert(Student stu) {
    String sql="insert into student values(?,?,?,?,?)";
    Object[] objs={stu.getSid(),stu.getSname(),stu.getSage(),stu.getShobby(),stu.getGid()};
    int num = this.mySql(sql, objs);
    return num;
}

@Override
public int update(Student stu) {
    String sql="update student set sname=? where sid=?";
    Object[] objs={stu.getSname(),stu.getSid()};
    int num = this.mySql(sql, objs);
    return num;
}

@Override
public int delete(Student stu) {
    String sql="delete from student where sid=?";
    Object[] objs={stu.getSid()};
    int num = this.mySql(sql, objs);
    return num;
}

@Override
public List<Student> select() {
    String sql="select * from student";
    ResultSet rs = this.getResultSet(sql, null);
    List<Student> list=null;
    try {
        list = new ArrayList<Student>();
        while(rs.next()){
            int sid = rs.getInt("sid");
            String sname = rs.getString("sname");
            int sage = rs.getInt("sage");
            String shobby = rs.getString("shobby");
            int gid = rs.getInt("gid");
            Student stu=new Student(sid, sname, sage, shobby, gid);
            list.add(stu);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return list;
}

@Override
public List<Student> select(Student stu) {
    String sql="select * from student where sid=?";
    Object[] objs={stu.getSid()};
    ResultSet rs = this.getResultSet(sql, objs);
    List<Student> list=null;
    try {
        list=new ArrayList<Student>();
        while(rs.next()){
            int sid = rs.getInt("sid");
            String sname = rs.getString("sname");
            int sage = rs.getInt("sage");
            String shobby = rs.getString("shobby");
            int gid = rs.getInt("gid");
            Student student=new Student(sid, sname, sage, shobby, gid);
            list.add(student);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }finally{
        this.close(this.connection, this.ps, rs);
    }
    return list;
}

@Override
public int insert(Grade grade) {
    String sql="insert into grade values(?,?)";
    Object[] objs={grade.getGid(),grade.getGname()};
    int num = this.mySql(sql, objs);
    return num;
}

@Override
public int update(Grade grade) {
    String sql="update grade set gname=? where gid=?";
    Object[] objs={grade.getGname(),grade.getGid()};
    int num = this.mySql(sql, objs);
    return num;
}

@Override
public int delete(Grade grade) {
    String sql="delete from grade where gid=?";
    Object[] objs={grade.getGid()};
    int num = this.mySql(sql, objs);
    return num;
}

@Override
public List<Grade> selectGrade() {
    String sql="select * from grade";
    ResultSet rs = this.getResultSet(sql, null);
    List<Grade> list=null;
    try {
        list=new ArrayList<Grade>();
        while(rs.next()){
            int gid = rs.getInt("gid");
            String gname = rs.getString("gname");
            Grade grade=new Grade(gid, gname);
            list.add(grade);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }finally{
        this.close(this.connection, this.ps, rs);
    }
    return list;
}

@Override
public List<Grade> select(Grade grade) {
    String sql="select * from grade where gid=?";
    Object[] objs={grade.getGid()};
    ResultSet rs = this.getResultSet(sql, objs);
    List<Grade> list=null;
    try {
        list=new ArrayList<Grade>();
        while(rs.next()){
            int gid = rs.getInt("gid");
            String gname = rs.getString("gname");
            Grade grad=new Grade(gid, gname);
            list.add(grad);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }finally{
        this.close(this.connection, this.ps, rs);
    }
    return list;
}

@Override
//分頁查詢
public List<Student> find(int index,int page) {
    String sql="select * from student limit ?,?";
    Object[] objs={index,page};
    List<Student> list = new ArrayList<Student>();
    ResultSet rs = null;
    try {
        rs = this.getResultSet(sql, objs);
        while(rs.next()){
            int sid = rs.getInt("sid");
            String sname = rs.getString("sname");
            int sage = rs.getInt("sage");
            String shobby = rs.getString("shobby");
            int gid = rs.getInt("gid");
            Student student = new Student(sid, sname, sage, shobby, gid);
            list.add(student);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }finally{
        this.close(this.connection, this.ps, rs);
    }
    return list;
}
//模糊查詢
public List<Student> likeSelect(Student stu){
    String sql="select * from student where sname like  \"%\" ? \"%\" ";
    Object[] objs={stu.getSname()};
    List<Student> list=new ArrayList<Student>();
    ResultSet rs = null;
    try {
        rs = this.getResultSet(sql, objs);
        while(rs.next()){
            int sid = rs.getInt("sid");
            String sname = rs.getString("sname");
            int sage = rs.getInt("sage");
            String shobby = rs.getString("shobby");
            int gid = rs.getInt("gid");
            Student student = new Student(sid, sname, sage, shobby, gid);
            list.add(student);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }finally{
        this.close(connection, ps, rs);
    }
    return list;
}

//根據主表查詢子表
public List<Student> getSql(Grade grade){
    String sql="select * from student where gid in(select gid from grade where gid=?)";
    Object[] objs={grade.getGid()};
    ResultSet rs = this.getResultSet(sql, objs);
    List<Student> list=new ArrayList<Student>();
    try {
        while(rs.next()){
            Student stu=new Student(rs.getInt("sid"),rs.getString("sname"),rs.getInt("sage"),rs.getString("shobby"),rs.getInt("gid"));
            list.add(stu);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }finally{
        this.close(connection, ps, rs);
    }
    return list;
}

}

package com.bdqn.entity;

import java.util.List;

/**
* 介面
* @author Administrator
*
*/
public interface TableImlp {

/**
 * student表
 * @param stu
 * @return
 */
//增加資料
public int insert(Student stu);
//修改資料
public int update(Student stu);
//刪改資料
public int delete(Student stu);
//查詢資料
public List<Student> select();
//條件查詢
public List<Student> select(Student stu);

/**
 * grade表
 */
public int insert(Grade grade);
//修改資料
public int update(Grade grade);
//刪改資料
public int delete(Grade grade);
//查詢資料
public List<Grade> selectGrade();
//條件查詢
public List<Grade> select(Grade grade);

//分頁查詢
public List<Student> find(int index,int page);
//模糊查詢
public List<Student> likeSelect(Student stu);

}

package com.bdqn.entity;

public class Grade {
private int gid;
private String gname;
public int getGid() {
return gid;
}
public void setGid(int gid) {
this.gid = gid;
}
public String getGname() {
return gname;
}
public void setGname(String gname) {
this.gname = gname;
}
public Grade(int gid, String gname) {
this.gid = gid;
this.gname = gname;
}
public Grade() {
}
@Override
public String toString() {
return “Grade [gid=” + gid + “, gname=” + gname + “]”;
}

}

package com.bdqn.entity;
/**
* 實體類
* @author Administrator
*
*/
public class Student {
private int sid;
private String sname;
private int sage;
private String shobby;
private int gid;
public int getSid() {
return sid;
}
public void setSid(int sid) {
this.sid = sid;
}
public String getSname() {
return sname;
}
public void setSname(String sname) {
this.sname = sname;
}
public int getSage() {
return sage;
}
public void setSage(int sage) {
this.sage = sage;
}
public String getShobby() {
return shobby;
}
public void setShobby(String shobby) {
this.shobby = shobby;
}
public int getGid() {
return gid;
}
public void setGid(int gid) {
this.gid = gid;
}
public Student(int sid, String sname, int sage, String shobby, int gid) {
this.sid = sid;
this.sname = sname;
this.sage = sage;
this.shobby = shobby;
this.gid = gid;
}
public Student() {
}
@Override
public String toString() {
return “Student [sid=” + sid + “, sname=” + sname + “, sage=” + sage
+ “, shobby=” + shobby + “, gid=” + gid + “]”;
}

}

package com.bdqn.test;

import java.util.List;

import com.bdqn.entity.Grade;
import com.bdqn.entity.Student;
import com.bdqn.util.Table;

public class Test {
public static void main(String[] args) {
Table table=new Table();
//grade表新增資料測試

/*  Grade grade=new Grade(1,"NO_1");
    table.insert(grade);
    Grade grade1=new Grade(2,"NO_2");
    table.insert(grade1);
    Grade grade2=new Grade(3,"NO_3");
    table.insert(grade2);*/

    //student表新增資料測試
    /*Student stu=new Student(1, "Tom_A", 25, "baseketBall", 1);
    table.insert(stu);
    Student stu1=new Student(2, "Tom_B", 20, "Ball", 2);
    table.insert(stu1);
    Student stu2=new Student(3, "Tom_C", 29, "footBall", 3);
    table.insert(stu2);*/

    //修改student表
    /*Student stu=new Student();
    stu.setSid(2);
    stu.setSname("Tom_m");
    table.update(stu);*/

    //修改grade表
    /*Grade grade=new Grade();
    grade.setGid(2);
    grade.setGname("NO_m");
    table.update(grade);*/

    //刪除student表中資料
    /*Student stu=new Student();
    stu.setSid(2);
    table.delete(stu);*/

    //刪除grade表中的資料
/*  Grade grade=new Grade();
    grade.setGid(2);
    table.delete(grade);*/

    //查詢student表中資料(全查)
    /*List<Student> select = table.select();
    for (Student student : select) {
        System.out.println(student.toString());
    }*/
    //條件查詢
    /*Student stu=new Student();
    stu.setSid(3);
    List<Student> select = table.select(stu);
    for (Student student : select) {
        System.out.println(student.toString());
    }*/

    //grade表查詢(全查)
    /*List<Grade> selectGrade = table.selectGrade();
    for (Grade grade : selectGrade) {
        System.out.println(grade.toString());
    }*/
    //條件查詢
    //Grade grade=new Grade();
    /*grade.setGid(3);
    List<Grade> select = table.select(grade);
    for (Grade grade2 : select) {
        System.out.println(grade2.toString());
    }*/

    //分頁查詢
    /*List<Student> find = table.find(0, 2);
    for (Student student : find) {
        System.out.println(student.toString());
    }*/

    //模糊查詢
    /*Student stu=new Student();
    stu.setSname("A");
    List<Student> likeSelect = table.likeSelect(stu);
    for (Student student : likeSelect) {
        System.out.println(student.toString());
    }*/

    //根據主表查詢字表
    Grade grade=new Grade();
    grade.setGid(3);
    List<Student> list = table.getSql(grade);
    for (Student student : list) {
        System.out.println(student);
    }
}

}

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/user
user=root
pwd=root