Spring Boot 连接MySql数据库

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);
}

 AppMessageMapper.xml

 AppMessage.java

 AppMessageService.java

 APPMessageController.java

运行App  输入地址测试，获取数据库数据......

 

标签: Spring Boot Mybatis Mysql

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posted @ 2016-02-29 18:27 凉城 阅读(53876) 评论(8) 编辑 收藏

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#1楼 2017-09-27 21:50 王弘博  

楼主你好，请问连接mysql的配置文件里，是不是参数一定要
这样写
spring.datasource.url
spring.datasource.username
这样子？因为我搭建的项目也是这样写，如果改成别的话，就连接不上，

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#2楼[楼主] 2017-09-28 14:38 凉城  

@ 王弘博
对的 这是spring boot默认的值！要自定义需要改代码

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#3楼 2017-11-17 15:23 SaltedFishkk  

大神你好,我照着你的来写,但是最后出现了这个错误怎么回事啊,可以帮忙看一下吗,谢谢了


2017-11-17 15:17:51.336 ERROR 6967 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Destroy method on bean with name 'org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory' threw an exception

java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6a472554: startup date [Fri Nov 17 15:17:50 CST 2017]; root of context hierarchy
at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:414) [spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.context.support.ApplicationListenerDetector.postProcessBeforeDestruction(ApplicationListenerDetector.java:97) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:253) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:578) [spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:554) [spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:961) [spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:523) [spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.destroySingletons(FactoryBeanRegistrySupport.java:230) [spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:968) [spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1030) [spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1006) [spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:958) [spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.boot.SpringApplication.handleRunFailure(SpringApplication.java:750) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
at com.saltedfish.demo.DemoApplication.main(DemoApplication.java:12) [classes/:na]

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#4楼[楼主] 2017-11-22 10:53 凉城  

@ SaltedFishkk
检查下自己代码，看看是否缺少注解

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#5楼 2017-12-27 15:59 silenceyy  

为什么我照着mybatis这种方式有错，提示：Consider defining a bean of type 'com.example.service.UserService' in your configuration.但是我照着你的一步步来的啊，路径也没有什么问题

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#6楼 2018-01-04 10:45 renjianguo  

我的项目启动了，访问getAll报500，但是在控制台打印出来了查询的结果，为什么？求解，弄了好长时间了，谁知道告诉一下呗，，谢谢
这是报的错：
java.lang.IllegalArgumentException: No converter found for return value of type: class java.util.ArrayList

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#7楼[楼主] 2018-01-22 13:18 凉城  

@ renjianguo
No converter found for return value of type: class java.util.ArrayList
这是说有了返回值，但是转换的时候报错了，可以看一下HrrpMessageConverter

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#8楼 2018-01-22 13:49 renjianguo  

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