mybatis出现sql异常时的日志优化-打印sql参数（版本2）

版本1有个问题，必须要配置mybaitis的logimp，否则会报错。重新写了了个新版本的插件拦截器，新版本的和配不配置logimp无关系，并且代码取自mybatis中的源代码，可保证正确效果

版本1参考地址：http://zhouchaofei2010.iteye.com/blog/2396421

package data.plugin;

 

import java.lang.reflect.Field;

import java.sql.PreparedStatement;

import java.util.ArrayList;

import java.util.List;

import java.util.Properties;

 

import org.apache.ibatis.executor.ErrorContext;

import org.apache.ibatis.executor.parameter.ParameterHandler;

import org.apache.ibatis.mapping.BoundSql;

import org.apache.ibatis.mapping.MappedStatement;

import org.apache.ibatis.mapping.ParameterMapping;

import org.apache.ibatis.mapping.ParameterMode;

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.reflection.MetaObject;

import org.apache.ibatis.scripting.defaults.DefaultParameterHandler;

import org.apache.ibatis.session.Configuration;

import org.apache.ibatis.type.TypeHandlerRegistry;

 

import comm.log.ILogger;

import comm.log.LoggerImpl;

 

@Intercepts({ @Signature(type = ParameterHandler.class, method = "setParameters", args = { PreparedStatement.class }) })

public class SQLErrorContextInterceptor implements Interceptor {

    private final ILogger logger = new LoggerImpl(this.getClass());

 

    @Override

    public Object intercept(Invocation invocation) throws Throwable {

        invocation.proceed();

        Object target=invocation.getTarget();

        if( ! (target instanceof  DefaultParameterHandler) ){

            return null;

        }

        DefaultParameterHandler hander=(DefaultParameterHandler)target;

        //获取DefaultParameterHandler中的5个属性

        Class<?> clz =hander.getClass();

        Field f = clz.getDeclaredField("mappedStatement");

        f.setAccessible(true);

        MappedStatement mappedStatement=(MappedStatement)f.get(hander);

        Configuration configuration = mappedStatement.getConfiguration();

        TypeHandlerRegistry typeHandlerRegistry=mappedStatement.getConfiguration().getTypeHandlerRegistry();

        f=clz.getDeclaredField("boundSql");

        f.setAccessible(true);

        BoundSql boundSql=(BoundSql)f.get(hander);

        Object parameterObject=hander.getParameterObject();

       

        //存储按参数顺序解析出的参数值

        List<Object> columnValues = new ArrayList<Object>();

       

        //迭代得到sql参数值

        List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();

        if (parameterMappings != null) {

          MetaObject metaObject = parameterObject == null ? null : configuration.newMetaObject(parameterObject);

          for (int i = 0; i < parameterMappings.size(); i++) {

            ParameterMapping parameterMapping = parameterMappings.get(i);

            if (parameterMapping.getMode() != ParameterMode.OUT) {

              Object value;

              String propertyName = parameterMapping.getProperty();

              if (boundSql.hasAdditionalParameter(propertyName)) { // issue #448 ask first for additional params

                value = boundSql.getAdditionalParameter(propertyName);

              } else if (parameterObject == null) {

                value = null;

              } else if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {

                value = parameterObject;

              } else {

                value = metaObject == null ? null : metaObject.getValue(propertyName);

              }

              columnValues.add(value);

            }

          }

        }

        //重写ErrorContext中sql的内容，使其带上参数信息

        ErrorContext.instance().sql(boundSql.getSql() + " parameters:" + this.getParameterValueString(columnValues));

        return null;

    }

   

   

    private  String getParameterValueString(List<Object> columnValues) {

        List<Object> typeList = new ArrayList<Object>(columnValues.size());

        for (Object value : columnValues) {

          if (value == null) {

            typeList.add("null");

          } else {

            typeList.add(value + "(" + value.getClass().getSimpleName() + ")");

          }

        }

        final String parameters = typeList.toString();

        return parameters.substring(1, parameters.length() - 1);

      }

 

    @Override

    public Object plugin(Object target) {

        return Plugin.wrap(target, this);

    }

 

    @Override

    public void setProperties(Properties properties) {

 

    }

 

}