一、Mybatis-plus介紹
Mybatis-plus是基於Mybatis開發的開源框架
Mybatis-plus封裝了分頁、條件查詢等內容
Mybatis-helper可以協議我們更好的使用Mybatis框架
二、Mybatis-plus配置
1、在父工程的pom.xml的dependencyManagement中增加。
這里只做依賴的管理
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!-- Mybatis-plus時引入的配置start -->
<!--mybatis-plus依賴-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>${mybatis.plus.version}</version>
</dependency>
<!--數據源驅動-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<!-- Druid引入 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>${druid.version}</version>
</dependency>
<!--代碼生成器-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>${mybatis.plus.version}</version>
</dependency>
<dependency>
<groupId>com.ibeetl</groupId>
<artifactId>beetl</artifactId>
<version>${beetl.version}</version>
</dependency>
<!--日志依賴框架-->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<!--Mybatis-plus時引入配置結束-->
</dependencies>
</dependencyManagement>
2、然后backend_common的pom.xml中增加mybatis-plus相關的依賴
<!--mybatis-plus依賴--> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> </dependency> <!-- Druid引入 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> </dependency> <!--數據源驅動--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <!--代碼生成器--> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-generator</artifactId> </dependency> <dependency> <groupId>com.ibeetl</groupId> <artifactId>beetl</artifactId> </dependency> <!--日志依賴框架--> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> </dependency> <!--mybatis-plus依賴 結束--> </dependencies>
在build下增加recources，目的在打包的時候，把java下面的所有xml文件打在src/main/resources文件夾下
3、在工程backend_common 增加Mybatis-plus配置
1）MybatisPlusConfig 配置文件
@Configuration
@EnableTransactionManagement
@MapperScan(basePackages = {"com.example.demo.common.**.dao.mapper"})
public class MybatisPlusConfig {
@Bean
public DruidDataSource dataSource(DruidProperties druidProperties) {
DruidDataSource dataSource = new DruidDataSource();
druidProperties.config(dataSource);
return dataSource;
}
/**
* mybatis-plus分頁插件
*/
@Bean
public PaginationInterceptor paginationInterceptor() {
return new PaginationInterceptor();
}
/**
* 樂觀鎖mybatis插件
*/
@Bean
public OptimisticLockerInterceptor optimisticLockerInterceptor() {
return new OptimisticLockerInterceptor();
}
}
2)、DruidProperties 配置文件
@Data
@Configuration
@ConfigurationProperties(prefix = "spring.datasource")
public class DruidProperties {
private String url = "jdbc:mysql://127.0.0.1:3306/backend_user_t?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=CONVERT_TO_NULL&useSSL=false&serverTimezone=UTC";
private String username = "root";
private String password = "123456";
private String driverClassName = "com.mysql.cj.jdbc.Driver";
private Integer initialSize = 2;
private Integer minIdle = 1;
private Integer maxActive = 20;
private Integer maxWait = 60000;
private Integer timeBetweenEvictionRunsMillis = 60000;
private Integer minEvictableIdleTimeMillis = 300000;
private String validationQuery = "SELECT 'x'";
private Boolean testWhileIdle = true;
private Boolean testOnBorrow = false;
private Boolean testOnReturn = false;
private Boolean poolPreparedStatements = true;
private Integer maxPoolPreparedStatementPerConnectionSize = 20;
private String filters = "stat";
public void config(DruidDataSource dataSource) {
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);
dataSource.setDriverClassName(driverClassName);
dataSource.setInitialSize(initialSize); //定義初始連接數
dataSource.setMinIdle(minIdle); //最小空閑
dataSource.setMaxActive(maxActive); //定義最大連接數
dataSource.setMaxWait(maxWait); //最長等待時間
// 配置間隔多久才進行一次檢測，檢測需要關閉的空閑連接，單位是毫秒
dataSource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
// 配置一個連接在池中最小生存的時間，單位是毫秒
dataSource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
dataSource.setValidationQuery(validationQuery);
dataSource.setTestWhileIdle(testWhileIdle);
dataSource.setTestOnBorrow(testOnBorrow);
dataSource.setTestOnReturn(testOnReturn);
// 打開PSCache，並且指定每個連接上PSCache的大小
dataSource.setPoolPreparedStatements(poolPreparedStatements);
dataSource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
try {
dataSource.setFilters(filters);
} catch (SQLException e) {
e.printStackTrace();
}
}
}
3)數據層內容生成
/*
數據層內容生成
*/
public class EntityGenerator {
// 生成輸出目錄，定位到工程的java目錄下
private String outputDir = "D:\\workspace\\springboot\\backend_parent\\backend_common\\src\\main\\java";
// 生成類的作者
private String author = "nick";
// 數據源相關配置
private String url = "jdbc:mysql://127.0.0.1:3306/springclouddeep?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=CONVERT_TO_NULL&useSSL=false&serverTimezone=UTC";
private String driverName = "com.mysql.cj.jdbc.Driver";
private String userName = "root";
private String userPwd = "123456";
// DAO的包路徑
private String daoPackage = "com.example.demo.common";
// 待生成的表名，注意是覆蓋更新
private static String[] tableNames;
static{
tableNames = new String[]{
"backend_user_t"
};
}
public static void main(String[] args) {
EntityGenerator entityGenerator = new EntityGenerator();
entityGenerator.entityGenerator();
}
//@Test
public void entityGenerator() {
AutoGenerator mpg = new AutoGenerator();
mpg.setTemplateEngine(new BeetlTemplateEngine());
// 全局配置
GlobalConfig gc = new GlobalConfig();
gc.setOutputDir(outputDir);
gc.setFileOverride(true);
gc.setActiveRecord(true);
gc.setEnableCache(false);
gc.setBaseResultMap(true);
gc.setBaseColumnList(false);
gc.setAuthor(author);
mpg.setGlobalConfig(gc);
// 數據源配置
DataSourceConfig dsc = new DataSourceConfig();
dsc.setUrl(url);
// dsc.setSchemaName("public");
dsc.setDriverName(driverName);
dsc.setUsername(userName);
dsc.setPassword(userPwd);
mpg.setDataSource(dsc);
// 策略配置
StrategyConfig strategy = new StrategyConfig();
//strategy.setTablePrefix(new String[]{"_"});// 此處可以修改為您的表前綴
strategy.setNaming(NamingStrategy.underline_to_camel);// 表名生成策略
strategy.setInclude(tableNames);
mpg.setStrategy(strategy);
// 包配置
PackageConfig pc = new PackageConfig();
pc.setParent(null);
pc.setEntity(daoPackage+".entity");
pc.setMapper(daoPackage+".mapper");
pc.setXml(daoPackage+".mapper.xml");
mpg.setPackageInfo(pc);
// 注入自定義配置，可以在 VM 中使用 cfg.abc 設置的值
InjectionConfig cfg = new InjectionConfig() {
@Override
public void initMap() {
Map<String, Object> map = new HashMap<>();
map.put("abc", this.getConfig().getGlobalConfig().getAuthor() + "-mp");
this.setMap(map);
}
};
mpg.setCfg(cfg);
// 執行生成
mpg.execute();
// 打印注入設置
System.err.println(mpg.getCfg().getMap().get("abc"));
}
}
然后運行main方法。生成的文件如下圖所示
