类型别名(typeAlicases)
在mybatis-config.xml配置文件中加入类描述
<typeAliases>
<typeAlias type="org.mybatis.example.User" alias="User" />
</typeAliases>
或者添加要扫描的包名
<typeAliases>
<package name="org.mybatis.example" />
<!--<typeAlias type="org.mybatis.example.User" alias="User" />-->
</typeAliases>
并在实体类添加注解@Alias
package org.mybatis.example;
import org.apache.ibatis.type.Alias;
@Alias("User")
public class User {
public User(String userName) {
this.userName = userName;
}
public User() {
}
private String userName;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
}
然后在映射文件xml中就可以用别名了
<select id="findAll" resultType="User" parameterType="String">
SELECT `userName` FROM `jc_user` LIMIT 1
</select>
插件(plugins)
在mybatis-config.xml配置文件中加入插件类的配置
<plugins>
<plugin interceptor="org.mybatis.example.ExamplePlugin">
</plugin>
</plugins>
只需实现 Interceptor 接口,并指定想要拦截的方法签名即可,目前项目中遇到的是拿这个插件功能做了查询分页
package org.mybatis.example;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.plugin.*;
import java.util.Properties;
@Intercepts({@Signature(
type= Executor.class,
method = "query",
args = {MappedStatement.class,Object.class})})
public class ExamplePlugin implements Interceptor {
@Override
public Object intercept(Invocation invocation) throws Throwable {
return invocation.proceed();
}
@Override
public Object plugin(Object target) {
return Plugin.wrap(target, this);
}
@Override
public void setProperties(Properties properties) {
}
}