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 + "]";
     }

 }

Student

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);
 }

IStudentService

 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);
     }

 }

StudentServiceImpl

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);
 }

IStudentDao

 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);
     }

 }

StudentDaoImpl

 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;
     }

 }

StudentRowMapper

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>

applicationContext

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

jdbc.properties

 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);
     }

 }

MyTest