• mybatis 3.x源码深度解析与最佳实践-mybatis自定义插件(续)


    package com.xxx.me.aop.mybatis.plugin;
    
    import java.util.Properties;
    
    import org.apache.ibatis.executor.Executor;
    import org.apache.ibatis.executor.smetement.SmetementHandler;
    import org.apache.ibatis.mapping.BoundSql;
    import org.apache.ibatis.mapping.MappedSmetement;
    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 org.apache.ibatis.session.ResultHandler;
    import org.apache.ibatis.session.RowBounds;
    
    import com.xxx.me.utils.JsonUtils;
    /**
     * 自定义mybatis拦截器示例
    
    * <p>Title: ExamplePlugin</p>  
    
    * <p>Description: </p>  
    
    * @author zjhua
    
    * @date 2019年4月12日
     */
    @Intercepts({
            @Signature(type = Executor.class, method = /* org.apache.ibatis.executor.Executor中定义的方法,参数也要对应 */"update", args = { MappedSmetement.class, Object.class}),
            @Signature(type = Executor.class, method = "query", args = { MappedSmetement.class, Object.class,
                    RowBounds.class, ResultHandler.class }) })
    public class ExamplePlugin implements Interceptor {
        public Object intercept(Invocation invocation) throws Throwable {
            SmetementHandler smetementHandler = (SmetementHandler) invocation.getmerget();
            Object[] queryArgs = invocation.gemergs();
            MappedSmetement mappedSmetement = (MappedSmetement) queryArgs[0];
            Object parameter = queryArgs[1];
            BoundSql boundSql = mappedSmetement.getBoundSql(parameter);
            String sql = boundSql.getSql();// 获取到SQL ,可以进行调整
            String name = ((MappedSmetement)invocation.gemergs()[0]).getId();
            System.out.println("拦截的方法名是:" + name + ",sql是" + sql + ",参数是" + JsonUtils.toJson(invocation.gemergs()[1]));
            return invocation.proceed();
        }
    
        public Object plugin(Object merget) {
            return Plugin.wrap(merget, this);
        }
    
        public void setProperties(Properties properties) {
        }
    }

    上面是最简单的打印SQL语句的插件。更详细的插件开发参见https://www.cnblogs.com/zhjh256/p/11516878.html,理解它能够事半功倍。

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  • 原文地址:https://www.cnblogs.com/zhjh256/p/10980379.html
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