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How SpringBoot connects to MySQL to obtain data and write back-end interface

王林

May 30, 2023 pm 12:26 PM

mysqldatabasespringboot

1. Create a new project

How SpringBoot connects to MySQL to obtain data and write back-end interface

2.Add dependencies

How SpringBoot connects to MySQL to obtain data and write back-end interface

<dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.20</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.3.8</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.3.8</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>5.3.8</version>
    </dependency>

3. Create DriverManagerDataSource and JdbcTemplate objects in spring container 3.1 Method to load spring container in springboot 1. Create spring container file under resource

resource ---->new- --->Directory---->new Directory(application)
How SpringBoot connects to MySQL to obtain data and write back-end interface

<bean class="org.springframework.jdbc.datasource.DriverManagerDataSource" id="dataSource">
        <!-- 1.1.数据库驱动 -->
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <!-- 1.2.连接数据库的url -->
        <property name="url" value="jdbc:mysql://localhost:3306/spring?characterEncoding=utf8&serverTimezone=UTC"/>
        <!-- 1.3.连接数据库的用户名 -->
        <property name="username" value="root"></property>
        <!-- 1.4.连接数据库的密码 -->
        <property name="password" value="root"></property>

    </bean>

    <bean class="org.springframework.jdbc.core.JdbcTemplate" id="jdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>

2. Define a common class and add Add the above annotation to automatically load the spring container after springboot starts

How SpringBoot connects to MySQL to obtain data and write back-end interface

4. Create an object class and control class Book

Pay attention to the @Data annotation here , it is a part of lombok, its main function is to automatically generate get and set methods during compilation, so we do not need to manually write get and set methods in this class, reducing our workload, very convenient, highly recommended

How SpringBoot connects to MySQL to obtain data and write back-end interface

BookDao

How SpringBoot connects to MySQL to obtain data and write back-end interface

TestController

How SpringBoot connects to MySQL to obtain data and write back-end interface ##application.properties

How SpringBoot connects to MySQL to obtain data and write back-end interface 5. Start the MySQL database

You can refer to the previous article

Install MySQL8.0 and operate visually in Navicat

How SpringBoot connects to MySQL to obtain data and write back-end interface 6. Run the test

As shown below, the operation is successful

How SpringBoot connects to MySQL to obtain data and write back-end interface Enter in the browser to see if the acquisition is successful

How SpringBoot connects to MySQL to obtain data and write back-end interface

Note:

8080 and springboot refer to application.properties
getbookList is customized in RequestMapping in TestController

At this point, the SpringBoot backend interface is written alright

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