峰Spring4学习（7）spring对JDBC的支持

第一节：

工程结构：

1）student.java:

package com.cy.model;

public class Student {

    private int id;

    private String name;

    private int age;

    public Student() {

        super();

        // TODO Auto-generated constructor stub

    }

    public Student(String name, int age) {

        super();

        this.name = name;

        this.age = age;

    }

    public Student(int id, String name, int age) {

        super();

        this.id = id;

        this.name = name;

        this.age = age;

    }

    public int getId() {

        return id;

    }

    public void setId(int 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 + "]";

    }

}

2)StudentDao.java/StudentDaoImpl.java:

package com.cy.dao;

import java.util.List;

import com.cy.model.Student;

public interface StudentDao {

    public int addStudent(Student student);

    public int updateStudent(Student student);

    public int deleteStudent(int id);

    public List<Student> findStudents();

}

package com.cy.dao.impl;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.jdbc.core.RowCallbackHandler;

import com.cy.dao.StudentDao;

import com.cy.model.Student;

public class StudentDaoImpl implements StudentDao {

    private JdbcTemplate jdbcTemplate;

    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {

        this.jdbcTemplate = jdbcTemplate;

    }

    @Override

    public int addStudent(Student student) {

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

        Object params[] = new Object[]{student.getName(), student.getAge()};

        return jdbcTemplate.update(sql, params);

    }

    @Override

    public int updateStudent(Student student) {

        String sql = "update t_student set name=?, age=? where id = ?";

        Object params[] = new Object[]{student.getName(), student.getAge(), student.getId()};

        return jdbcTemplate.update(sql, params);

    }

    @Override

    public int deleteStudent(int id) {

        String sql = "delete from t_student where id = ?";

        Object params[] = new Object[]{id};

        return jdbcTemplate.update(sql, params);

    }

    /**

     * 查询所有的学生

     */

    @Override

    public List<Student> findStudents() {

        String sql = "select * from t_student";

        final List<Student> studentList = new ArrayList<Student>();

        jdbcTemplate.query(sql, new RowCallbackHandler(){

            @Override

            public void processRow(ResultSet rs) throws SQLException {

                Student student = new Student();

                student.setId(rs.getInt("id"));

                student.setName(rs.getString("name"));

                student.setAge(rs.getInt("age"));

                studentList.add(student);

            }

        });

        return studentList;

    }

}

3)StudentService.java/StudentServiceImpl.java:

package com.cy.service;

import java.util.List;

import com.cy.model.Student;

public interface StudentService {

    public int addStudent(Student student);

    public int updateStudent(Student student);

    public int deleteStudent(int id);

    public List<Student> findStudents();

}

package com.cy.service.impl;

import java.util.List;

import com.cy.dao.StudentDao;

import com.cy.model.Student;

import com.cy.service.StudentService;

public class StudentServiceImpl implements StudentService{

    private StudentDao studentDao;

    public void setStudentDao(StudentDao studentDao) {

        this.studentDao = studentDao;

    }

    @Override

    public int addStudent(Student student) {

        return studentDao.addStudent(student);

    }

    @Override

    public int updateStudent(Student student) {

        return studentDao.updateStudent(student);

    }

    @Override

    public int deleteStudent(int id) {

        return studentDao.deleteStudent(id);

    }

    @Override

    public List<Student> findStudents() {

        return studentDao.findStudents();

    }

}

4)beans.xml配置文件：

<?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:aop="http://www.springframework.org/schema/aop"

    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/aop

        http://www.springframework.org/schema/aop/spring-aop.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context.xsd">

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">

        <property name="driverClassName" value="${jdbc.driverClassName}"/>

        <property name="url" value="${jdbc.url}"/>

        <property name="username" value="${jdbc.username}"/>

        <property name="password" value="${jdbc.password}"/>

    </bean>

    <context:property-placeholder location="jdbc.properties"/>

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">

        <property name="dataSource" ref="dataSource"></property>

    </bean>

    <bean id="studentDao" class="com.cy.dao.impl.StudentDaoImpl">

        <property name="jdbcTemplate" ref="jdbcTemplate"></property>

    </bean> 

    <bean id="studentService" class="com.cy.service.impl.StudentServiceImpl">

        <property name="studentDao" ref="studentDao"></property>

    </bean> 

</beans>

5）jdbc.properties：

jdbc.driverClassName=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://localhost:3306/db_spring

jdbc.username=root

jdbc.password=root

6)测试代码：

package com.cy.test;

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.cy.model.Student;

import com.cy.service.StudentService;

public class T {

    private ApplicationContext ac;

    @Before

    public void setUp() throws Exception {

        ac=new ClassPathXmlApplicationContext("beans.xml");

    }

    @Test

    public void addStudent() {

        StudentService studentService=(StudentService)ac.getBean("studentService");

        int addNums=studentService.addStudent(new Student("晶", 1));

        if(addNums==1){

            System.out.println("添加成功");

        }

    }

    @Test

    public void updateStudent() {

        StudentService studentService=(StudentService)ac.getBean("studentService");

        int updateNums=studentService.updateStudent(new Student(4, "杨静", 10));

        if(updateNums==1){

            System.out.println("修改成功");

        }

    }

    @Test

    public void deleteStudent() {

        StudentService studentService=(StudentService)ac.getBean("studentService");

        int deleteNums = studentService.deleteStudent(4);

        if(deleteNums==1){

            System.out.println("删除成功！");

        }

    }

    @Test

    public void findStudents() {

        StudentService studentService=(StudentService)ac.getBean("studentService");

        List<Student> studentList = studentService.findStudents();

        for(Student student : studentList){

            System.out.println(student);

        }

    }

}

查询所有学生findStudents方法console打印：

第二节：

1.通过继承JdbcDaoSupport，我们原来的JdbcTemplate就不用写了：

根据上面项目的代码，做些修改：

1)StudentDaoImpl.java:

package com.cy.dao.impl;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import org.springframework.jdbc.core.RowCallbackHandler;

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

import com.cy.dao.StudentDao;

import com.cy.model.Student;

public class StudentDaoImpl extends JdbcDaoSupport implements StudentDao {

    @Override

    public int addStudent(Student student) {

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

        Object params[] = new Object[]{student.getName(), student.getAge()};

        return this.getJdbcTemplate().update(sql, params);

    }

    @Override

    public int updateStudent(Student student) {

        String sql = "update t_student set name=?, age=? where id = ?";

        Object params[] = new Object[]{student.getName(), student.getAge(), student.getId()};

        return this.getJdbcTemplate().update(sql, params);

    }

    @Override

    public int deleteStudent(int id) {

        String sql = "delete from t_student where id = ?";

        Object params[] = new Object[]{id};

        return this.getJdbcTemplate().update(sql, params);

    }

    /**

     * 查询所有的学生

     */

    @Override

    public List<Student> findStudents() {

        String sql = "select * from t_student";

        final List<Student> studentList = new ArrayList<Student>();

        this.getJdbcTemplate().query(sql, new RowCallbackHandler(){

            @Override

            public void processRow(ResultSet rs) throws SQLException {

                Student student = new Student();

                student.setId(rs.getInt("id"));

                student.setName(rs.getString("name"));

                student.setAge(rs.getInt("age"));

                studentList.add(student);

            }

        });

        return studentList;

    }

}

2)beans.xml配置：

<?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:aop="http://www.springframework.org/schema/aop"

    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/aop

        http://www.springframework.org/schema/aop/spring-aop.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context.xsd">

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">

        <property name="driverClassName" value="${jdbc.driverClassName}"/>

        <property name="url" value="${jdbc.url}"/>

        <property name="username" value="${jdbc.username}"/>

        <property name="password" value="${jdbc.password}"/>

    </bean>

    <context:property-placeholder location="jdbc.properties"/>

    <bean id="studentDao" class="com.cy.dao.impl.StudentDaoImpl">

        <property name="dataSource" ref="dataSource"></property>

    </bean> 

    <bean id="studentService" class="com.cy.service.impl.StudentServiceImpl">

        <property name="studentDao" ref="studentDao"></property>

    </bean> 

</beans>

测试代码不变，执行都ok；

2.NamedParameterJdbcTemplate 的使用：

1）StudentDaoImpl.java:

package com.cy.dao.impl;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import org.springframework.jdbc.core.RowCallbackHandler;

import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;

import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;

import com.cy.dao.StudentDao;

import com.cy.model.Student;

public class StudentDaoImpl implements StudentDao {

    private NamedParameterJdbcTemplate namedParameterJdbcTemplate;

    public void setNamedParameterJdbcTemplate(NamedParameterJdbcTemplate namedParameterJdbcTemplate) {

        this.namedParameterJdbcTemplate = namedParameterJdbcTemplate;

    }

    @Override

    public int addStudent(Student student) {

        String sql = "insert into t_student values (null, :name, :age)";

        MapSqlParameterSource sps = new MapSqlParameterSource();

        sps.addValue("name", student.getName())

            .addValue("age", student.getAge());

        return namedParameterJdbcTemplate.update(sql, sps);

    }

    @Override

    public int updateStudent(Student student) {

        String sql = "update t_student set name=:name, age=:age where id =:id";

        MapSqlParameterSource sps = new MapSqlParameterSource();

        sps.addValue("name", student.getName())

            .addValue("age", student.getAge())

            .addValue("id", student.getId());

        return namedParameterJdbcTemplate.update(sql, sps);

    }

    @Override

    public int deleteStudent(int id) {

        String sql = "delete from t_student where id = :id";

        MapSqlParameterSource sps = new MapSqlParameterSource();

        sps.addValue("id", id);

        return namedParameterJdbcTemplate.update(sql, sps);

    }

    /**

     * 查询所有的学生

     */

    @Override

    public List<Student> findStudents() {

        String sql = "select * from t_student";

        final List<Student> studentList = new ArrayList<Student>();

        namedParameterJdbcTemplate.query(sql, new RowCallbackHandler(){

            @Override

            public void processRow(ResultSet rs) throws SQLException {

                Student student = new Student();

                student.setId(rs.getInt("id"));

                student.setName(rs.getString("name"));

                student.setAge(rs.getInt("age"));

                studentList.add(student);

            }

        });

        return studentList;

    }

}

2)beans.xml配置：

<?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:aop="http://www.springframework.org/schema/aop"

    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/aop

        http://www.springframework.org/schema/aop/spring-aop.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context.xsd">

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">

        <property name="driverClassName" value="${jdbc.driverClassName}"/>

        <property name="url" value="${jdbc.url}"/>

        <property name="username" value="${jdbc.username}"/>

        <property name="password" value="${jdbc.password}"/>

    </bean>

    <context:property-placeholder location="jdbc.properties"/>

    <bean id="namedParameterJdbcTemplate" class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">

        <constructor-arg ref="dataSource"></constructor-arg>

    </bean>

    <bean id="studentDao" class="com.cy.dao.impl.StudentDaoImpl">

        <property name="namedParameterJdbcTemplate" ref="namedParameterJdbcTemplate"></property>

    </bean> 

    <bean id="studentService" class="com.cy.service.impl.StudentServiceImpl">

        <property name="studentDao" ref="studentDao"></property>

    </bean> 

</beans>

测试代码不变，测试ok

----------------------------------

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