Springboot學習第二天-SpriingBoot+mybatis+mysql的配置
阿新 • • 發佈：2018-12-12
本文在第一天基礎上完成，首先確認已經建立好了一個基礎的SpringBoot專案。
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第一步 修改POM.XML檔案，加入SpringBoot對Mybatis的依賴。我這裡一共是加了三個依賴。其中druid-spring-boot-starter為阿里的資料庫連線池、mybatis-spring-boot-starter為SpringBoot對mybatis的支援、mysql-connector-java為mysql的資料庫連線。配置完成後的程式碼如下：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.qlys</groupId> <artifactId>spring-learn</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.15.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jetty</artifactId> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.9</version> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> </dependencies> </project>
- 第二步 修改完成pom.xml檔案後，需要在application.yml中配置資料庫的相關資訊。如果在第一天中沒有將application.properties檔案改為application.yml，這個配置也可以在application.properties檔案中配置。在這個檔案中需要加入三方面的配置，第一步為資料庫的連線配置，第二個為資料庫連線池的配置，第三個為mybatis的配置。配置資訊如下所示：
server: port: 8888 spring: datasource: password: 123456 username: root url: jdbc:mysql://127.0.0.1:3306/bjx-test?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true&zeroDateTimeBehavior=convertToNull driver-class-name: com.mysql.jdbc.Driver type: com.alibaba.druid.pool.DruidDataSource druid: validation-query: select '*' initial-size: 1 max-active: 20 max-wait: 1000 filters: stat pool-prepared-statements: true mybatis: mapper-locations: classpath*:com/qlys/dao/xml/*.xml type-aliases-package: com.qlys.dao.mapper
- 第三步 增加相關的資料庫的操作程式碼。資料庫操作的為路徑為com.qlys.dao。其中語句配置檔案在com.qlys.dao.xml目錄下，程式碼檔案在com.qlys.dao.mapper目錄下。Mapper程式碼檔案如下：
package com.qlys.dao.mapper; import java.util.List; import java.util.Map; public interface SystemMapper { public List<Map<String, String>> select(); public int delete(Map<String, String>para); public int insert(Map<String, String>para); }
資料庫語句配置檔案如下：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.qlys.dao.mapper.SystemMapper">
<select id="select" resultType="map">
SELECT * FROM a_table
</select>
<insert id="insert" parameterType="map">
INSERT INTO a_table(a_id,a_name,a_part) VALUES(#{id},#{name},#{part})
</insert>
<delete id="delete" parameterType="map">
delete from a_table where a_id=#{id}
</delete>
</mapper>- 第四步 增加Service層，處理資料庫操作。程式碼路徑為com.qlys.service，程式碼如下：
package com.qlys.service;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.qlys.dao.mapper.SystemMapper;
@Service
public class SystemService {
@Autowired
private SystemMapper mapper;
public Object query() {
return mapper.select();
}
public void delete(Map<String, String> map) throws Exception {
mapper.delete(map);
}
public void insert (Map<String, String>para) throws Exception {
mapper.insert(para);
}
}
- 第五步 修改原有的TestController類，增加對Service的操作，用於釋出相關的介面。修改後的程式碼如下：
package com.qlys.controller;
import java.util.HashMap;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.qlys.service.SystemService;
@RestController
public class TestController {
@RequestMapping("/")
public String index() {
return "hello word";
}
@Autowired
private SystemService service;
@RequestMapping("/query")
public Object query() {
return this.service.query();
}
@RequestMapping("/insert")
public Object insert() {
Map<String, String> para = new HashMap<>();
try {
para.put("id", "10");
para.put("name", "name");
para.put("part", "part");
this.service.insert(para);
return "success";
} catch (Exception e) {
e.printStackTrace();
}
return "error";
}
@RequestMapping("/delete")
public Object delete() {
Map<String, String> para = new HashMap<>();
try {
para.put("id", "10");
this.service.delete(para);
return "success";
} catch (Exception e) {
e.printStackTrace();
}
return "error";
}
}
- 第六步 修改原有的啟動類Application類，增加對資料庫Mapper的掃描，註解MapperScan即用於掃描相關的Mapper類。修改後的程式碼如下：
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
@ComponentScan("com.qlys")
@MapperScan("com.qlys.dao.mapper")
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
修改完成後，啟動專案測試。