利用mybtis插件打印完整的sql，将占位符？替换成实际值

import org.apache.ibatis.cache.CacheKey;
import org.apache.ibatis.executor.Executor;
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.*;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Profile;
import org.springframework.stereotype.Component;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Properties;
/**
 * 打印sql
 *
 * @date 2019/1/14 20:13
 */
@Component
@Profile({"dev", "test"})
@Intercepts({
  @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class}),
  @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class, CacheKey.class, BoundSql.class}),
  @Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class})}
)
public class SqlInterceptor implements Interceptor {
 private static ThreadLocal dateTimeFormatter = new ThreadLocal() {
  @Override
  protected SimpleDateFormat initialValue() {
   return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  }
 };
 @Override
 public Object intercept(Invocation invocation) throws Throwable {
  Object result = null;
  //捕获掉异常，不要影响业务
  try {
   MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
   Object parameter = null;
   if (invocation.getArgs().length > 1) {
    parameter = invocation.getArgs()[1];
   }
   String sqlId = mappedStatement.getId();
   BoundSql boundSql = mappedStatement.getBoundSql(parameter);
   Configuration configuration = mappedStatement.getConfiguration();
   long startTime = System.currentTimeMillis();
   try {
    result = invocation.proceed();
   } finally {
    long endTime = System.currentTimeMillis();
    long sqlCostTime = endTime - startTime;
    String sql = this.getSql(configuration, boundSql);
    this.formatSqlLog(sqlId, sql, sqlCostTime, result);
   }
   return result;
  } catch (Exception e) {
   return result;
  }
 }
 @Override
 public Object plugin(Object target) {
  if (target instanceof Executor) {
   return Plugin.wrap(target, this);
  }
  return target;
 }
 @Override
 public void setProperties(Properties properties) {
 }
 /**
  * 获取完整的sql语句
  *
  * @param configuration
  * @param boundSql
  * @return
  */
 private String getSql(Configuration configuration, BoundSql boundSql) {
  // 输入sql字符串空判断
  String sql = boundSql.getSql();
  if (StringUtil.isEmpty(sql)) {
   return "";
  }
  return formatSql(sql, configuration, boundSql);
 }
 /**
  * 将占位符替换成参数值
  *
  * @param sql
  * @param configuration
  * @param boundSql
  * @return
  */
 private String formatSql(String sql, Configuration configuration, BoundSql boundSql) {
  //美化sql
  sql = beautifySql(sql);
  //填充占位符, 目前基本不用mybatis存储过程调用,故此处不做考虑
  Object parameterObject = boundSql.getParameterObject();
  List parameterMappings = boundSql.getParameterMappings();
  TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
  List parameters = new ArrayList<>();
  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) {
     // 参数值
     Object value;
     String propertyName = parameterMapping.getProperty();
     // 获取参数名称
     if (boundSql.hasAdditionalParameter(propertyName)) {
      // 获取参数值
      value = boundSql.getAdditionalParameter(propertyName);
     } else if (parameterObject == null) {
      value = null;
     } else if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
      // 如果是单个值则直接赋值
      value = parameterObject;
     } else {
      value = metaObject == null ? null : metaObject.getValue(propertyName);
     }
     if (value instanceof Number) {
      parameters.add(String.valueOf(value));
     } else {
      StringBuilder builder = new StringBuilder();
      builder.append("'");
      if (value instanceof Date) {
       builder.append(dateTimeFormatter.get().format((Date) value));
      } else if (value instanceof String) {
       builder.append(value);
      }
      builder.append("'");
      parameters.add(builder.toString());
     }
    }
   }
  }
  for (String value : parameters) {
   sql = sql.replaceFirst("\\?", value);
  }
  return sql;
 }
 /**
  * 格式化sql日志
  *
  * @param sqlId
  * @param sql
  * @param costTime
  * @return
  */
 private void formatSqlLog(String sqlId, String sql, long costTime, Object obj) {
  String sqlLog = "==> " + sql;
  StringBuffer result = new StringBuffer();
  if (obj instanceof List) {
   List list = (List) obj;
   int count = list.size();
   result.append("<==  Total: " + count);
  } else if (obj instanceof Integer) {
   result.append("<==  Total: " + obj);
  }
  result.append("  Spend Time ==> " + costTime + " ms");
  Logger log = LoggerFactory.getLogger(sqlId);
  log.info(sqlLog);
  log.info(result.toString());
 }
 public static String beautifySql(String sql) {
  sql = sql.replaceAll("[\\s\n ]+", " ");
  return sql;
 }
}

补充知识：Mybatis配置控制台输出SQL语句填充占位符

我们使用spring整合mybatis时候，希望根据控制台输出的sql语句来复制到Navicat等工具去测试，配置如下

在mybatis的配置文件mybatis-config.xml中配置

配置上面后就可以在控制台输出sql语句了，但是语句与条件会分开输出，我们想填充sql语句的占位符的话需要再spring整合mybatis中加配置

只要添加这个即可