Spring Boot 连接MySql数据库
Spring Boot 以后也许会成为入门Spring的首选!
记一下Spring Boot 成功连接Mysql数据库的方法步骤！
一、新建Maven工程，不全Maven所需文件夹，在pom.xml引入SpringBoot的依赖包！可以参照：http://www.cnblogs.com/liangblog/p/5207855.html
二、有两种方法与数据库建立连接，一种是集成Mybatis，另一种用JdbcTemplate
(1)、用JdbcTemplate
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency>
添加配置文件配置数据库和其他参数
在resource文件夹下添加application.properties配置文件并输入数据库参数，如下：
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test spring.datasource.username=root spring.datasource.password=123456 spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.datasource.max-idle=10 spring.datasource.max-wait=10000 spring.datasource.min-idle=5 spring.datasource.initial-size=5 server.port=8011 server.session.timeout=10 server.tomcat.uri-encoding=UTF-8
新建Controller类测试数据库连接
package com.lgp.SpringBoot; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.Set; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController @RequestMapping("/mydb") public class DbController { @Autowired private JdbcTemplate jdbcTemplate; @RequestMapping("/getUsers") public List<Map<String, Object>> getDbType(){ String sql = "select * from appuser"; List<Map<String, Object>> list = jdbcTemplate.queryForList(sql); for (Map<String, Object> map : list) { Set<Entry<String, Object>> entries = map.entrySet( ); if(entries != null) { Iterator<Entry<String, Object>> iterator = entries.iterator( ); while(iterator.hasNext( )) { Entry<String, Object> entry =(Entry<String, Object>) iterator.next( ); Object key = entry.getKey( ); Object value = entry.getValue(); System.out.println(key+":"+value); } } } return list; } @RequestMapping("/user/{id}") public Map<String,Object> getUser(@PathVariable String id){ Map<String,Object> map = null; List<Map<String, Object>> list = getDbType(); for (Map<String, Object> dbmap : list) { Set<String> set = dbmap.keySet(); for (String key : set) { if(key.equals("id")){ if(dbmap.get(key).equals(id)){ map = dbmap; } } } } if(map==null) map = list.get(0); return map; } }
运行App 输入地址 输出数据库数据。。。。。。
2)、集成Mybatis
添加mybatis依赖
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.0.0</version>
</dependency>
版本号可能有更新！
在配置文件中添加配置信息：
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test spring.datasource.username=root spring.datasource.password=123456 spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.datasource.max-idle=10 spring.datasource.max-wait=10000 spring.datasource.min-idle=5 spring.datasource.initial-size=5 server.port=8011 server.session.timeout=10 server.tomcat.uri-encoding=UTF-8 # mybatis.config= classpath:mybatis-config.xml mybatis.mapperLocations=classpath:mappers/*.xml # domain object's package mybatis.typeAliasesPackage=com.lgp.SpringBoot.bean # handler's package # mybatis.typeHandlersPackage= # check the mybatis configuration exists # mybatis.check-config-location= # mode of execution. Default is SIMPLE # mybatis.executorType=
依次添加mapper的接口类和xml文件
主要代码：
package com.lgp.SpringBoot.mapper; import java.util.List; import com.lgp.SpringBoot.bean.AppMessage; public interface AppMessageMapper { int deleteByPrimaryKey(String id); int insert(AppMessage record); int insertSelective(AppMessage record); AppMessage selectByPrimaryKey(String id); int updateByPrimaryKeySelective(AppMessage record); int updateByPrimaryKey(AppMessage record); List<AppMessage> selectAll(); List<AppMessage> getMessById(String id); }
<?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.lgp.SpringBoot.mapper.AppMessageMapper" > <resultMap id="BaseResultMap" type="com.lgp.SpringBoot.bean.AppMessage" > <id column="id" property="id" jdbcType="VARCHAR" /> <result column="message" property="message" jdbcType="VARCHAR" /> <result column="senddate" property="senddate" jdbcType="TIMESTAMP" /> </resultMap> <sql id="Base_Column_List" > id, message, senddate </sql> <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.String" > select <include refid="Base_Column_List" /> from appuser_message where id = #{id,jdbcType=VARCHAR} </select> <delete id="deleteByPrimaryKey" parameterType="java.lang.String" > delete from appuser_message where id = #{id,jdbcType=VARCHAR} </delete> <insert id="insert" parameterType="com.lgp.SpringBoot.bean.AppMessage" > insert into appuser_message (id, message, senddate ) values (#{id,jdbcType=VARCHAR}, #{message,jdbcType=VARCHAR}, #{senddate,jdbcType=TIMESTAMP} ) </insert> <insert id="insertSelective" parameterType="com.lgp.SpringBoot.bean.AppMessage" > insert into appuser_message <trim prefix="(" suffix=")" suffixOverrides="," > <if test="id != null" > id, </if> <if test="message != null" > message, </if> <if test="senddate != null" > senddate, </if> </trim> <trim prefix="values (" suffix=")" suffixOverrides="," > <if test="id != null" > #{id,jdbcType=VARCHAR}, </if> <if test="message != null" > #{message,jdbcType=VARCHAR}, </if> <if test="senddate != null" > #{senddate,jdbcType=TIMESTAMP}, </if> </trim> </insert> <update id="updateByPrimaryKeySelective" parameterType="com.lgp.SpringBoot.bean.AppMessage" > update appuser_message <set > <if test="message != null" > message = #{message,jdbcType=VARCHAR}, </if> <if test="senddate != null" > senddate = #{senddate,jdbcType=TIMESTAMP}, </if> </set> where id = #{id,jdbcType=VARCHAR} </update> <update id="updateByPrimaryKey" parameterType="com.lgp.SpringBoot.bean.AppMessage" > update appuser_message set message = #{message,jdbcType=VARCHAR}, senddate = #{senddate,jdbcType=TIMESTAMP} where id = #{id,jdbcType=VARCHAR} </update> <select id="selectAll" resultMap="BaseResultMap"> select id, message, senddate from appuser_message order by senddate asc </select> <select id="getMessById" resultMap="BaseResultMap" parameterType="java.lang.String"> select id, message, senddate from appuser_message where id = #{id,jdbcType=VARCHAR} order by senddate asc </select> </mapper>
package com.lgp.SpringBoot.bean; import java.util.Date; public class AppMessage { private String id; private String message; private Date senddate; public String getId() { return id; } public void setId(String id) { this.id = id == null ? null : id.trim(); } public String getMessage() { return message; } public void setMessage(String message) { this.message = message == null ? null : message.trim(); } public Date getSenddate() { return senddate; } public void setSenddate(Date senddate) { this.senddate = senddate; } }
package com.lgp.SpringBoot.service; import java.util.ArrayList; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.lgp.SpringBoot.bean.AppMessage; import com.lgp.SpringBoot.mapper.AppMessageMapper; @Service public class AppMessageService { @Autowired private AppMessageMapper mapper; public List<AppMessage> getMessage(){ List<AppMessage> list = new ArrayList<AppMessage>(); list.add(mapper.selectByPrimaryKey("xtt")); //list = mapper.selectAll(); return list; } public List<AppMessage> getAllMessage(){ List<AppMessage> list = new ArrayList<AppMessage>(); list = mapper.selectAll(); return list; } public int addMessage(AppMessage appMessage) { return mapper.insert(appMessage); } public List<AppMessage> getMessageById(String id) { return mapper.getMessById(id); } public int delMessage(String id) { return mapper.deleteByPrimaryKey(id); } }
package com.lgp.SpringBoot.controller; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; import com.lgp.SpringBoot.bean.AppMessage; import com.lgp.SpringBoot.service.AppMessageService; @RestController @RequestMapping("/appmessage") public class APPMessageController { @Autowired private AppMessageService service; @RequestMapping("/getThree") public List<AppMessage> getThreeForMessage(){ List<AppMessage> list = service.getMessage(); return list; } @RequestMapping("/getAll") public List<AppMessage> getAllMessage(){ List<AppMessage> list = service.getAllMessage(); int num = list.size(); if(null!=list && num>3){ for (int i = 0; i < num-3; i++) { list.remove(0); } } return list; } @RequestMapping("/getByID") public List<AppMessage> getMessageById(@RequestParam("id") String id){ List<AppMessage> list = service.getMessageById(id); int num = list.size(); if(null!=list && num>5){ for (int i = 0; i < num-5; i++) { list.remove(0); } } return list; } @RequestMapping(value = "/add",method = RequestMethod.POST) public int addMessage(@RequestBody AppMessage appMessage){ return service.addMessage(appMessage); } @RequestMapping(value="/delMessageById",method=RequestMethod.POST) public int delMessageById(@RequestParam("id") String id){ return service.delMessage(id); } }
运行App 输入地址测试，获取数据库数据......
