必须导入的依赖:
<!--mysql驱动-->
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<version>8.0.32</version>
</dependency>
如果用mybatis的话就用
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.2</version>
</dependency>
如果是自己实现的话就用jdbc的依赖
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.url= jdbc:mysql://localhost:3306/boot
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
将上述的配置整合后SpringBoot就会自动生成DataSource类 ,就可以直接用
public class JdbcTemplate extends JdbcAccessor implements JdbcOperations {
private static final String RETURN_RESULT_SET_PREFIX = "#result-set-";
private static final String RETURN_UPDATE_COUNT_PREFIX = "#update-count-";
private boolean ignoreWarnings = true;
private int fetchSize = -1;
private int maxRows = -1;
private int queryTimeout = -1;
private boolean skipResultsProcessing = false;
private boolean skipUndeclaredResults = false;
private boolean resultsMapCaseInsensitive = false;
public JdbcTemplate() {
}
相关功能就可以通过jdbcTemplate实现
通过原生的JDBC查询数据
@RestController
public class JDBCController {
@Autowired
JdbcTemplate jdbcTemplate;
@RequestMapping("/test01")
public String testJDBC(){
String sql = "select * from employee";
List<Map<String, Object>> maps = jdbcTemplate.queryForList(sql);
for (Map map : maps){
System.out.println(map);
}
return "maps";
}
}
在springBoot的application.properties文件中
mybatis.mapper-locations=classpath:com.demo.mapper/*.xml
mybatis.type-aliases-package=com.demo.pojo
# 开启下划线与驼峰命名的转换
mybatis.configuration.map-underscore-to-camel-case=true
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.2</version>
</dependency>
<!--mysql驱动-->
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<version>8.0.32</version>
</dependency>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<configuration>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
</plugin>
逆向工程配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!--
targetRuntime: 执行生成的逆向工程的版本
MyBatis3Simple: 生成基本的CRUD(简洁版)
MyBatis3: 生成带条件的CRUD(终极版)
-->
<!--数据库本地jar包-->
<classPathEntry location="D:\lib\mysql-connector-java-8.0.29.jar"/>
<context id="DB2Tables" targetRuntime="MyBatis3Simple">
<property name="javaFileEncoding" value="UTF-8"/>
<!--suppressAllComments 设置为true 则不再生成注释-->
<commentGenerator>
<property name="suppressAllComments" value="true" />
</commentGenerator>
<!-- 数据库的连接信息 -->
<jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/boot"
userId="root"
password="root">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- javaBean : 数据库表对应的实体类-->
<javaModelGenerator targetPackage="com.demo.pojo" targetProject=".\src\main\java">
<property name="enableSubPackages" value="true" />
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!-- SQL映射文件 : 与Mapper接口对应 -->
<sqlMapGenerator targetPackage="com.demo.mapper" targetProject=".\src\main\resources">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator>
<!-- Mapper接口 :实现相关功能的接口 -->
<javaClientGenerator type="XMLMAPPER"
targetPackage="com.demo.mapper" targetProject=".\src\main\java">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<!-- 逆向工程的表 与 需要创建的类名 -->
<!-- tableName 设置为*号,可以对应所有表,此时可以不写domainObjectName -->
<!-- domainObjectName属性指定 生成出来的实体类的类名 -->
<table tableName="employee" domainObjectName="employee"/>
</context>
</generatorConfiguration>
通过generator:generate即可生成