Spring框架+jdbcTemplate实现增删改查功能

springmvc架构(model(实体类),service,controller层)

controller(接收参数调用业务层)–>service(调用持久层，处理业务逻辑)–>dao(与数据库交互)

1. ioc（控制反转是一种设计思想而不是技术）

di(依赖注入):是ioc思想的一种技术实现

ioc容器是spring提供的保存bean对象的容器

bean管理操作

1.xml + 注解

2.javaconfig + 注解

通过xml配置bean:todo:

通过javaconfig 配置bean:todo:

通过注解配置bean:todo:

2. aop（面向切面）

面向切面的程序设计思想。横向的调用。

eg：一个日志的功能，很多的功能模块都需要去使用，可以写一个切面去做这个事情。

使用@aspect来标记一个普通类为切面。

连接点：比如说日志需要作用的方法。

目标对象：日志需要使用的对象。

1. 添加依赖

<!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->
<dependency>
    <groupid>org.springframework</groupid>
    <artifactid>spring-aop</artifactid>
    <version>5.3.8</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
    <groupid>org.aspectj</groupid>
    <artifactid>aspectjweaver</artifactid>
    <version>1.9.7</version>
    <scope>runtime</scope>
</dependency>

2.demo练习

需求：springioc + jdbctemplate实现简单的数据库操作

1.新建maven项目并引入spring核心4依赖

<!--spring的4个基础jar包（容器包）-->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupid>org.springframework</groupid>
            <artifactid>spring-context</artifactid>
            <version>5.3.1</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
        <dependency>
            <groupid>org.springframework</groupid>
            <artifactid>spring-core</artifactid>
            <version>5.3.1</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
        <dependency>
            <groupid>org.springframework</groupid>
            <artifactid>spring-beans</artifactid>
            <version>5.3.1</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-expression -->
        <dependency>
            <groupid>org.springframework</groupid>
            <artifactid>spring-expression</artifactid>
            <version>5.3.1</version>
        </dependency>

jdbc依赖

<!--spring整合jdbc-->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupid>org.springframework</groupid>
            <artifactid>spring-jdbc</artifactid>
            <version>5.3.6</version>
        </dependency>

        <!--mysql驱动-->
        <dependency>
            <groupid>mysql</groupid>
            <artifactid>mysql-connector-java</artifactid>
            <version>5.1.47</version>
        </dependency>

junit5

<!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api -->
        <dependency>
            <groupid>org.junit.jupiter</groupid>
            <artifactid>junit-jupiter-api</artifactid>
            <version>5.3.2</version>
            <scope>test</scope>
        </dependency>

2. 创建springconfig配置文件（通过javaconfig方式注入bean）

创建springconfig类，添加@configuration标记为配置类。

配置数据源和jdbctemplate的bean。

/**
 * @author yonc
 * @date 2021/9/2
 */
@configuration
public class springconfig {
    @bean
    public datasource datasource() {
        mysqldatasource datasource = new mysqldatasource();
        datasource.seturl("jdbc:mysql://localhost:3306/test?useunicode=ture&charactorencoding=utf-8&servertimezone=utc");
        datasource.setuser("root");
        datasource.setpassword("123456");
        return datasource;
    }

    @bean
    public jdbctemplate jdbctemplate(datasource datasource) {
        return new jdbctemplate(datasource);
    }
}

3.创建mvc架构并创建与数据库字段对应的实体类对象

实体类：studentpo

public class studentpo {
    private long id;
    private string name;
    private string age;

    public studentpo() {
    }

    public studentpo(string name, string age) {
        this.name = name;
        this.age = age;
    }

    public studentpo(long id, string name, string age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public long getid() {
        return id;
    }

    public void setid(long id) {
        this.id = id;
    }

    public string getname() {
        return name;
    }

    public void setname(string name) {
        this.name = name;
    }

    public string getage() {
        return age;
    }

    public void setage(string age) {
        this.age = age;
    }

    @override
    public string tostring() {
        return "studentpo{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

4. 编写dao层

面向接口编程，首先定义dao层的规范接口，定义了增删改查4种方法

/**
 * @author yonc
 * @date 2021/9/2
 */
public interface studentdao {
    void addstudent(studentpo student);

    void delstudentbyid(long id);

    void updatestudent(studentpo student);

    list<studentpo> selectstudent();
}

接口的实现

@repository注解将studentdao注入ioc容器

@autowired自动装配jdbctemplate对象,jdbctemplate对象已经在springconfig文件中实例化

/**
 * @author yonc
 * @date 2021/9/2
 */
@repository
public class studentdaoimpl implements studentdao {


    @autowired
    jdbctemplate jdbctemplate;

    /*
     * 增加student
     * */
    @override
    public void addstudent(studentpo student) {
        jdbctemplate.update("insert into student (name,age) values (?,?)", student.getname(), student.getage());
    }

    /*
     * 删除student
     * */
    @override
    public void delstudentbyid(long id) {
        jdbctemplate.update("delete from student where id=?", id);
    }

    /*
     * 修改student
     * */
    @override
    public void updatestudent(studentpo student) {
        string sql = "update student set name=?,age=? where id = ? ";
        object[] args = {student.getname(), student.getage(), student.getid()};
        jdbctemplate.update(sql, args);
    }

    /*
     * 查询
     * */
    @override
    public list<studentpo> selectstudent() {
        string sql = "select id,name,age from student";
        return this.jdbctemplate.query(sql, (rs, index) -> {
            studentpo student = new studentpo();
            student.setid(rs.getlong("id"));
            student.setname(rs.getstring("name"));
            student.setage(rs.getstring("age"));
            return student;
        });
    }
}

5. dao与数据库的增删改查已经实现，使用service层去调用dao层的方法。

首先定义service层的接口

/**
 * @author yonc
 * @date 2021/9/2
 */
public interface studentservice {

    void addstudent(studentpo student);

    void delstudentbyid(long id);

    void updatestudent(studentpo student);

    list<studentpo> selectstudent();
}

接口实现

@service将对象声明ioc容器中

@autowired自动装配ioc容器中的studentdao将studentdao对象初始化

/**
 * @author yonc
 * @date 2021/9/2
 */
@service
public class studentserviceimpl implements studentservice {

    @autowired
    studentdao studentdao;

    @override
    public void addstudent(studentpo student) {
        studentdao.addstudent(student);
    }

    @override
    public void delstudentbyid(long id) {
       studentdao.delstudentbyid(id);
    }

    @override
    public void updatestudent(studentpo student) {
       studentdao.updatestudent(student);
    }

    @override
    public list<studentpo> selectstudent() {
        return studentdao.selectstudent();
    }
}

6. 使用junit5单元测试测试

首先通过ioc容器拿到studentservice对象

private annotationconfigapplicationcontext applicationcontext = new annotationconfigapplicationcontext(springconfig.class);
    // 通过spring的ioc容器
    private studentservice studentservice = applicationcontext.getbean(studentservice.class);

测试

/**
 * @author yonc
 * @date 2021/9/2
 */
class studentserviceimpltest {

    private annotationconfigapplicationcontext applicationcontext = new annotationconfigapplicationcontext(springconfig.class);
    // 通过spring的ioc容器
    private studentservice studentservice = applicationcontext.getbean(studentservice.class);
    @test
    public void testaddstudent() {

        studentservice.addstudent(new studentpo("zahngsna", "999"));
        system.out.println("添加成功！");
    }

    @test
    public void testdelstudent() {
        studentservice.delstudentbyid(3l);
        system.out.println("删除成功！");
    }

    @test
    public void testupdatestudent() {
        //将id为3的student的name修改为"wang",age修改为21
        studentservice.updatestudent(new studentpo(1l,"wang","28"));
        system.out.println("修改成功！");
    }

    @test
    public void testselectstudent() {
        studentservice.selectstudent().foreach(system.out::println);
    }

}

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