Spring_Spring与DAO_Spring的Jdbc模板

一、导入Jar包

二、定义实体类与DB表

public class Student {
    private Integer id;
    private String name;
    private int age;

    
    public Student() {
        super();
    }

    public Student( String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
    }

}

三、定义Service

import java.util.List;

import com.jmu.beans.Student;
//service业务
public interface IStudentService {
   void addStudent(Student student);
   void removeById(int id);
   void modifyStudent(Student student);
   
   List<String> findAllStudentsNames();
   String findStudentNameById(int id);
   
   List<Student> findAllStudents();
   Student findStudentById(int id);
}

import java.util.List;

import com.jmu.beans.Student;
import com.jmu.dao.IStudentDao;

public class StudentServiceImpl implements IStudentService {
    private IStudentDao dao;

    public void setDao(IStudentDao dao) {
        this.dao = dao;
    }

    @Override
    public void addStudent(Student student) {
        // TODO Auto-generated method stub
      dao.insertStudent(student);
        
    }

    @Override
    public void removeById(int id) {
        // TODO Auto-generated method stub
     dao.deleteById(id);
    }

    @Override
    public void modifyStudent(Student student) {
        // TODO Auto-generated method stub
      dao.updateStudent(student);
    }

    @Override
    public List<String> findAllStudentsNames() {
        // TODO Auto-generated method stub
        return dao.selectAllStudentsNames();
    }

    @Override
    public String findStudentNameById(int id) {
        // TODO Auto-generated method stub
        return dao.selectStudentNameById(id);
    }

    @Override
    public List<Student> findAllStudents() {
        // TODO Auto-generated method stub
        return dao.selectAllStudents();
    }

    @Override
    public Student findStudentById(int id) {
        // TODO Auto-generated method stub
        return dao.selectStudentById(id);
    }

}

四、定义Dao

import java.util.List;

import com.jmu.beans.Student;

//Dao增删改查
public interface IStudentDao {
    void insertStudent(Student student);
    void deleteById(int id);
    void updateStudent(Student student);

    List<String> selectAllStudentsNames();
    String selectStudentNameById(int id);

    List<Student> selectAllStudents();
    Student selectStudentById(int id);
}

import java.util.List;

import org.springframework.jdbc.core.support.JdbcDaoSupport;

import com.jmu.beans.Student;

public class StudentDaoImpl extends JdbcDaoSupport implements IStudentDao {

    @Override
    public void insertStudent(Student student) {
        // TODO Auto-generated method stub
        String sql="insert into student(name,age) value(?,?)";
        this.getJdbcTemplate().update(sql, student.getName(),student.getAge());
    }

    @Override
    public void deleteById(int id) {
        // TODO Auto-generated method stub
      String sql="delete from student where id=?";
      this.getJdbcTemplate().update(sql, id);
    }

    @Override
    public void updateStudent(Student student) {
        // TODO Auto-generated method stub
     String  sql="update student set name=?,age=? where id=?";
     this.getJdbcTemplate().update(sql, student.getName(),student.getAge(),student.getId());
     
    }

    @Override
    public List<String> selectAllStudentsNames() {
        // TODO Auto-generated method stub
        String sql="select name from student";
        return this.getJdbcTemplate().queryForList(sql, String.class);
    }

    @Override
    public String selectStudentNameById(int id) {
        // TODO Auto-generated method stub
        String sql="select name from student where id=?";
        return this.getJdbcTemplate().queryForObject(sql, String.class,id);
    }

    @Override
    public List<Student> selectAllStudents() {
        // TODO Auto-generated method stub
        String sql="select id,name,age from student";
        return this.getJdbcTemplate().query(sql, new StudentRowMapper());
    }

    @Override
    public Student selectStudentById(int id) {
        // TODO Auto-generated method stub
        String sql="select id,name,age from student where id=?";
        return this.getJdbcTemplate().queryForObject(sql, new StudentRowMapper(),id);
    }

}

import java.sql.ResultSet;
import java.sql.SQLException;

import org.springframework.jdbc.core.RowMapper;

import com.jmu.beans.Student;

public class StudentRowMapper implements RowMapper<Student> {

    //rs:当查询出总的结果集后，框架会自动遍历这个结果集，每一次遍历的一行数据，都会被存放到这个方法的rs参数中，也就是说，这里的rs代表的是一行数据，并非所有查询结果，换个角度，只要能执行这个方法，就说明这里的rs不会是空的
    @Override
    public Student mapRow(ResultSet rs, int rowNum) throws SQLException {
        // TODO Auto-generated method stub、
        Student student=new Student();
        student.setId(rs.getInt("id"));
        student.setName(rs.getString("name"));
        student.setAge(rs.getInt("age"));
        return student;
    }

}

五、相应的注册

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!--注册数据源:Spring内置连接池 -->
    <!-- <bean id="myDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property 
        name="url" value="jdbc:mysql://127.0.0.1:3306/test1"/> <property name="username" 
        value="root"/> <property name="password" value="123456"/> </bean> -->

    <!--注册数据源:DBCP -->
    <!-- <bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource"> 
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property 
        name="url" value="jdbc:mysql://127.0.0.1:3306/test1"/> <property name="username" 
        value="root"/> <property name="password" value="123456"/> </bean> -->
    <!--注册数据源:C3P0 -->
    <!-- <bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> 
        <property name="driverClass" value="com.mysql.jdbc.Driver"/> <property name="jdbcUrl" 
        value="jdbc:mysql://127.0.0.1:3306/test1"/> <property name="user" value="root"/> 
        <property name="password" value="123456"/> </bean> -->
    <!--注册数据源:C3P0 -->
    <bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}" />
        <property name="jdbcUrl" value="${jdbc.url}" />
        <property name="user" value="${jdbc.user}" />
        <property name="password" value="${jdbc.password}" />
    </bean>

    <!-- 注册属性文件：方式一 -->
    <!-- <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 
        <property name="location" value="classpath:jdbc.properties"></property> </bean> -->
    <context:property-placeholder location="classpath:jdbc.properties" />

    <!--注册JdbcTemplate(模板) -->
    <!-- <bean id="myJdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> 
        <property name="dataSource" ref="myDataSource" /> </bean> 
        注册Dao 
        <bean id="studentDao" class="com.jmu.dao.StudentDaoImpl"> 
          <property name="jdbcTemplate" ref="myJdbcTemplate" /> 
        </bean> -->
    <!--注册Dao -->
    <bean id="studentDao" class="com.jmu.dao.StudentDaoImpl">
        <property name="dataSource" ref="myDataSource" />

    </bean>

    <!-- 注册Service -->
    <bean id="studentService" class="com.jmu.service.StudentServiceImpl">
        <property name="dao" ref="studentDao" />
    </bean>
</beans>

六、从属性文件读取DB四要素

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/test1
jdbc.user=root
jdbc.password=123456

 七、定义测试类

import java.util.List;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.jmu.beans.Student;
import com.jmu.service.IStudentService;

public class MyTest {

    private IStudentService service;

    @Before
    public void before() {
        //创建容器对象
        String resource = "applicationContext.xml";
        ApplicationContext ac=new ClassPathXmlApplicationContext(resource);  
        service = (IStudentService) ac.getBean("studentService");
    }
    
    @Test
    public void test01() {
        Student student=new Student("张三", 23);
        service.addStudent(student);
    }
    
    @Test
    public void test02() {
        service.removeById(2);        
    }

    @Test
    public void test03() {
        Student student=new Student("王意义", 23);
        student.setId(3);
        service.modifyStudent(student);
    }
    @Test
    public void test04() {
        List<String> names = service.findAllStudentsNames();
        System.out.println(names);
    }
    @Test
    public void test05() {
        String names = service.findStudentNameById(3);
        System.out.println(names);
    }
    
    @Test
    public void test06() {
        List<Student> students=service.findAllStudents();
        for (Student student : students) {
            System.out.println(student);
        }
    }
    
    @Test
    public void test07() {
        Student student=service.findStudentById(3);
        System.out.println(student);
    }
    
    
}