使用軟件：mysql、eclipse

鏈接步驟：

1.注冊驅動

2.創建一個連接對象

3.寫sql語句

4.執行sql語句并返回一個結果或者結果集

5.關閉鏈接(一般就是connection、statement、setresult)這三個連接對象，關閉順序一般是(setresult? ? --->? statement? -->? setresult? )

一、直接連接方法：(這種方法就是講sql語句和結果所有的步驟寫在一起) 不建議使用該方法

1 public static voidmain(String[] args) {2 String url = "jdbc:mysql://localhost:3306/students";3 String user = "root";4 String password = "admin";5 Connection conn = null;6 Statement st = null;7

8 try{9 //1. 注冊驅動

10 Class.forName("com.mysql.jdbc.Driver");11 //2. 創建一個鏈接對象

12 conn =DriverManager.getConnection(url,user,password);13 //3. 創建一個sql語句的發送命令對象

14 String sql = "insert into student values('2001','Tom','20','7000')";15 st=conn.createStatement();16 //4. 執行sql語句，拿到查詢的結果集對象

17 st.executeQuery(sql);20 } catch(Exception e) {21 e.printStackTrace();22 }finally{23 //5. 關閉鏈接 ，命令對象 ，結果集

24 if(st != null) {25 try{26 st.close();27 } catch(Exception e) {28 e.printStackTrace();29 }30 }31 if(conn != null) {32 try{33 conn.close();34 } catch(Exception e) {35 e.printStackTrace();36 }37 }38 }

二、建立工具類方法，將必要的幾步寫一個類，使用的時候直接調用(建議使用)

1.注冊驅動、創建連接對象、關閉資源? ? 這三部一般可以寫一個類，由于寫sql語句和執行sql語句的結果不一致，所以可以將其在用到的時候在寫

2.一般寫工具類都是寫成靜態方法，以方便調用

//這是工具類：

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.Statement;

public class JdbcUtils {

private static String driverName = "com.mysql.jdbc.Driver";

private static String url = "jdbc:mysql://localhost:3306/student_achievement_system";

private static String user = "root";

private static String password = "admin";

/**

* 鏈接數據庫

*/

static {

try {

Class.forName(JdbcUtils.driverName);

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* 獲取鏈接對象connection

* @return

*/

public static Connection getConnection() {

try {

return DriverManager.getConnection(JdbcUtils.url, JdbcUtils.user, JdbcUtils.password);

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

/**

* 關閉資源

* @param conn

* @param st

* @param rs

*/

public static void close(Connection conn,Statement st,ResultSet rs) {

if(rs != null) {

try {

rs.close();

} catch (Exception e) {

e.printStackTrace();

}

}

if(st != null) {

try {

st.close();

} catch (Exception e) {

e.printStackTrace();

}

}

if(conn != null) {

try {

conn.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

}

//這是對數據庫的基本操作類

// 增加、刪除、更新、查找一條、查找所有的方法

public class StudentsDaoImpl implements IStudentsDao {

//增加

@Override

public int save(Students student) {

Connection conn = null;

PreparedStatement ps = null;

try {

conn = JdbcUtils.getConnection();

String sql = "insert into students values(?,?,?,?,?,?)";

ps = conn.prepareStatement(sql);

ps.setInt(1, student.getStudentId());

ps.setString(2, student.getStudentName());

ps.setString(3, student.getSex());

ps.setString(4, student.getPhoneNo());

ps.setString(5, student.getAddress());

ps.setDate(6, (Date) student.getBirthday());

int row = ps.executeUpdate();

return row;

} catch (Exception e) {

e.printStackTrace();

}finally {

JdbcUtils.close(conn, ps, null);

}

return 0;

}

//刪除

@Override

public int delete(int studentId) {

Connection conn = null;

PreparedStatement ps = null;

try {

conn = JdbcUtils.getConnection();

String sql = "delete from students where studentId=?";

ps = conn.prepareStatement(sql);

ps.setInt(1, studentId);

int row = ps.executeUpdate();

return row;

} catch (Exception e) {

e.printStackTrace();

}finally {

JdbcUtils.close(conn, ps, null);

}

return 0;

}

//更新

@Override

public int update(int studentId, Students student) {

Connection conn = null;

PreparedStatement ps = null;

try {

conn = JdbcUtils.getConnection();

String sql = "update students set studentName=?,sex=?,phoneNo=?,address=?,birthday=? where studentId=?";

ps = conn.prepareStatement(sql);

ps.setString(1, student.getStudentName());

ps.setString(2, student.getSex());

ps.setString(3, student.getPhoneNo());

ps.setString(4, student.getAddress());

ps.setDate(5, ((Date) student.getBirthday()));

ps.setInt(6, studentId);

int row = ps.executeUpdate();

return row;

} catch (Exception e) {

e.printStackTrace();

}finally {

JdbcUtils.close(conn, ps, null);

}

return 0;

}

//查找一條數據

@Override

public Students getByStudentId(int studentId) {

Connection conn = null;

PreparedStatement ps = null;

ResultSet rs = null;

try {

conn = JdbcUtils.getConnection();

String sql = "select * from students where studentId=?";

ps = conn.prepareStatement(sql);

ps.setInt(1, studentId);

rs = ps.executeQuery();

if(rs.next()) {

Students student = new Students();

student.setStudentId(rs.getInt("studentId"));

student.setStudentName(rs.getString("studentName"));

student.setSex(rs.getString("sex"));

student.setPhoneNo(rs.getString("phoneNo"));

student.setAddress(rs.getString("address"));

student.setBirthday(rs.getDate("birthday"));

return student;

}

} catch (Exception e) {

e.printStackTrace();

}finally {

JdbcUtils.close(conn, ps, rs);

}

return null;

}

//查找所有數據

@Override

public List getAll() {

Connection conn = null;

PreparedStatement ps = null;

ResultSet rs = null;

try {

conn = JdbcUtils.getConnection();

String sql = "select * from students";

ps = conn.prepareStatement(sql);

rs = ps.executeQuery();

List studentsList = new ArrayList<>();

while(rs.next()) {

Students student = new Students();

student.setStudentId(rs.getInt("studentId"));

student.setStudentName(rs.getString("studentName"));

student.setSex(rs.getString("sex"));

student.setPhoneNo(rs.getString("phoneNo"));

student.setAddress(rs.getString("address"));

student.setBirthday(rs.getDate("birthday"));

studentsList.add(student);

}

return studentsList;

} catch (Exception e) {

e.printStackTrace();

}finally {

JdbcUtils.close(conn, ps, rs);

}

return null;

}

}

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