MyBatis Interceptor

最新推荐文章于 2025-05-26 16:49:58 发布

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最新推荐文章于 2025-05-26 16:49:58 发布

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分类专栏： MyBatis

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本文详细介绍了MyBatis的插件机制，包括四种核心对象类型：Executor、ParameterHandler、ResultSetHandler和StatementHandler，以及如何通过实现Interceptor接口来创建自定义插件，例如ExamplePlugin，用于拦截Executor的update方法。

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type可以是四中对象：
Executor (update, query, flushStatements, commit, rollback, getTransaction, close, isClosed)
ParameterHandler (getParameterObject, setParameters)
ResultSetHandler (handleResultSets, handleOutputParameters)
StatementHandler (prepare, parameterize, batch, update, query)

import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;

import java.util.Properties;
import java.util.concurrent.Executor;

@Intercepts({@Signature(
  type= Executor.class,
  method = "update",
  args = {MappedStatement.class,Object.class})})
public class ExamplePlugin implements Interceptor {
  public Object intercept(Invocation invocation) throws Throwable {
    MappedStatement mappedStatement= (MappedStatement) invocation.getTarget();
    return invocation.proceed();
  }
  public Object plugin(Object target) {
    return Plugin.wrap(target, this);
  }
  public void setProperties(Properties properties) {
  }
}