因為實習(xí)用的是MyBatis框架,所以寫一篇關(guān)于SpringBoot整合MyBatis框架的總結(jié)。
一,Pom文件
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<?xml version= "1.0" encoding= "UTF-8" ?> <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.example</groupId> <artifactId>example</artifactId> <version> 1.0 -SNAPSHOT</version> <packaging>jar</packaging> //這里設(shè)置為jar,因為我們會使用jar包部署運行 <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version> 1.4 . 2 .RELEASE</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- https: //mvnrepository.com/artifact/org.mybatis/mybatis --> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> //Mybatis的jar包 <version> 1.1 . 1 </version> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> //json數(shù)據(jù)格式和對象的轉(zhuǎn)換jar包 <version> 1.9 . 8 </version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>com.h2database</groupId> //內(nèi)嵌數(shù)據(jù)庫 <artifactId>h2</artifactId> <version> 1.3 . 156 </version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> //lombok插件,方便model對象的處理 <version> 1.16 . 2 </version> </dependency> <!-- https: //mvnrepository.com/artifact/mysql/mysql-connector-java --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> //mysql驅(qū)動 <version> 5.1 . 18 </version> </dependency> </dependencies> <build> <finalName>example</finalName> //打包后的jar包名稱 <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> //必須要的SpringBoot繼承的maven插件,缺少了無法打包jar。 <executions> <execution> <goals> <goal>repackage</goal> </goals> </execution> </executions> </plugin> <plugin> <artifactId>maven-resources-plugin</artifactId> //因為jar包中可能存在很多其他的配置資源,例如mapper文件所以打包為jar包需要將其加入,所以需要此資源打包插件 <version> 2.5 </version> <executions> <execution> <id>copy-xmls</id> <phase>process-sources</phase> <goals> <goal>copy-resources</goal> </goals> <configuration> <outputDirectory>${basedir}/target/classes</outputDirectory> <resources> <resource> <directory>${basedir}/src/main/java</directory> <includes> <include>** /*.xml</include> </includes> </resource> </resources> </configuration> </execution> </executions> </plugin> </plugins> <resources> //打包包含相應(yīng)的資源文件 <resource> <directory>src/main/resources</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> <include>**/*.tld</include> </includes> <filtering>false</filtering> </resource> <resource> <directory>src/main/java</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> <include>**/ *.tld</include> </includes> <filtering> false </filtering> </resource> </resources> </build> <repositories> //設(shè)置倉庫 <repository> <id>spring-milestone</id> <url>http: //repo.spring.io/libs-release</url> </repository> </repositories> </project> |
好了簡單的SpringBoot整合Mybatis框架的基礎(chǔ)環(huán)境已經(jīng)搭建完成了,一個Pom文件搞定,接下來我們配置我們的配置文件。
二,配置文件
我們寫在resources目錄下的application.properties文件中。
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spring.datasource.url=jdbc:mysql: //localhost:3306/數(shù)據(jù)庫名稱?useUnicode=true&characterEncoding=UTF8 spring.datasource.username=用戶名 spring.datasource.password=用戶密碼 spring.datasource.driver- class -name=com.mysql.jdbc.Driver mybatis.mapper-locations=classpath*:/mapper/*Mapper.xml //mapper文件的路徑 mybatis.type-aliases- package =map.model //mapper文件中的前綴 server.port=監(jiān)聽端口號,不設(shè)置默認 8080 |
ok,現(xiàn)在環(huán)境已經(jīng)徹底搭建完成我們可以編寫自己的代碼了。
三,編寫代碼
Model對象
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@Data //@Data lombok插件的注解自動添加get set方法 public class ExampleModel { private Long id; private String name; } //一個簡單的model對象 |
Dao層
這里需要注意的是,推薦公司使用的一種做法,因為很多的Dao對象都是簡單的增刪改查功能,所以我們抽象出一個最基本的父類,這個父類實現(xiàn)最基本的增刪改查功能,每個新的Dao對象可以繼承這個類,然后自定義實現(xiàn)特殊的數(shù)據(jù)庫訪問功能,我們可以把這個基本的父類成為MyBatisHelper并用上泛型,具體實現(xiàn)如下:
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@Data public class MybatisHelper<T> { @Autowired private SqlSession sqlSession; //這里自動注入mybatis的SqlSession private String nameSpace; public MybatisHelper(String nameSpace) { this .nameSpace = nameSpace; } public String getSqlName(String sqlName) { return nameSpace + "." + sqlName; } public Integer create(String name, T obj) { return sqlSession.insert(getSqlName(name), obj); } public Boolean update(String name, T obj) { return Boolean.valueOf(sqlSession.update(getSqlName(name), obj) > 0 ); } public T findById(String name, Long id) { return sqlSession.selectOne(getSqlName(name), id); } public Boolean delete(String name, Long id) { return Boolean.valueOf(sqlSession.delete(getSqlName(name), id) > 0 ); } public List<T> findAll(String name){ return sqlSession.selectList(getSqlName(name));} } |
需要說明的是因為sqlSession的執(zhí)行回去尋找相應(yīng)的mapper文件,所以namespace+方法名稱很重要,這個一定要注意不要弄錯了,弄錯了就會無法正確調(diào)用。
然后我們的Dao層實現(xiàn)繼承此類
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@Component public class ExampleModelDao extends MybatisHelper<ExampleModel>{ public ExampleModelDao() { super ( "example.dao." ); } //todo 自定義操作 public Integer findDataCounts(){ return getSqlSession().selectOne(getSqlName( "findDataCounts" )); //他會尋找example.dao.findDataCounts對應(yīng)的方法執(zhí)行 } } |
這樣是不是很簡單,也能大量復(fù)用很省事,關(guān)于service層我就不寫了很簡單。
四,mapper文件
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<?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= "example.dao" > //這里很重要就是前綴 <resultMap id= "ExampleModelMap" type= "ExampleMode" > <id column= "id" property= "id" /> <result column= "name" property= "name" /> </resultMap> //自定義resultMap對象,利于對象的操作 <sql id= "tb" > //數(shù)據(jù)表標(biāo)簽 example_data </sql> <sql id= "value_exclude_id" > //除了主鍵以為的字段集合標(biāo)簽 name </sql> <sql id= "vls" > //插入屬性的字段集合標(biāo)簽 id,name </sql> <sql id= "insert_value" > //插入輸入進來的字段值標(biāo)簽 #{name} </sql> <insert id= "create" parameterType= "ExampleModel" > INSERT INTO <include refid= "tb" /> (<include refid= "value_exclude_id" />) VALUES (<include refid= "insert_value" />) </insert> //一看就明白了創(chuàng)建一個對象 <select id= "findById" parameterType= "long" resultMap= "ExampleModelMap" > //返回我們定義的resultMap SELECT <include refid= "vls" /> FROM <include refid= "tb" /> WHERE id = #{id} </select> <select id= "findAll" resultMap= "ExampleModelMap" > SELECT <include refid= "vls" /> FROM <include refid= "tb" /> </select> <select id= "findDataCounts" resultType= "int" > SELECT count( 1 ) FROM <include refid= "tb" /> </select> //自定義的操作 </mapper> |
ok,對應(yīng)的mapper文件已經(jīng)有了,我們就可以調(diào)用了,調(diào)用很簡單一般寫在service層中調(diào)用,下面我們?nèi)ゾ帉憣?yīng)的controller。
五,控制器編寫
推薦使用restful風(fēng)格,因此我們控制器編寫代碼如下:
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@RestController @CrossOrigin //這個是ajax跨域請求允許的注解,不用可以去掉 public class DigMapDataController { @Autowired private ExampleService exampleService; //service對象 @RequestMapping (value = "/create" , method = RequestMethod.POST) public String create( @requestBody ExampleModel exampleModel) { return String.valueOf(exampleService.create(exampleModel)); } //@requestBody注解會接受前端的JSON數(shù)據(jù)并配合jackson自動轉(zhuǎn)換為相應(yīng)的對象 @RequestMapping (value = "/find/count" ,method = RequestMethod.GET) public Integer findCounts() { return exampleService.findDataCounts(); } } |
一個簡單的控制器就編寫完成了,這個時候我們可以啟動應(yīng)用進行數(shù)據(jù)訪問了,是不是很簡單。
六,應(yīng)用的部署
直接在終端中使用命令,將應(yīng)用打包為jar文件
1.maven [clean] package ;打包后的文件在target目錄下
2.java -jar example.jar ; 運行我們的jar包程序
ok 大功告成!
以上所述是小編給大家介紹的SpringBoot+MyBatis簡單數(shù)據(jù)訪問應(yīng)用的實例代碼,希望對大家有所幫助,如果大家有任何疑問歡迎給我留言!
原文鏈接:http://www.cnblogs.com/lfjjava/p/6093114.html