本文主要介绍SpringBoot项目如何添加Mybatis拦截器,从而实现打印完整SQL语句、结果集以及耗时。涵盖了XML配置以及零XML配置两种方式。
废话少说,先附上代码吧,后面讲解一下需要注意的点。
打印完整SQL拦截器
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections4.CollectionUtils;
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.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.springframework.core.env.Environment;
import org.springframework.util.ObjectUtils;
import java.text.DateFormat;
import java.util.*;
import java.util.regex.Matcher;
import java.util.stream.Collectors;
@Slf4j
@Intercepts({@Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class}),
@Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class})})
public class MybatisSqlInterceptor extends BaseMybatisInterceptor implements Interceptor {
private static final DateFormat FORMATTER = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
private List<String> getPrintSqlMapperIdList() {
Environment environment = getEnvironment();
//自行配置需要打印sql的sqlId
String printSqlMapperIdStr = environment.getProperty("printSqlMapperIdStr");
if (!ObjectUtils.isEmpty(printSqlMapperIdStr)) {
return Arrays.stream(printSqlMapperIdStr.split(SPLITTER_COMMA)).collect(Collectors.toList());
}
return new ArrayList<>();
}
@Override
public Object intercept(Invocation invocation) throws Throwable {
try {
// 获取xml中的一个select/update/insert/delete节点,是一条SQL语句
MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
Object parameter = null;
// 获取参数,if语句成立,表示sql语句有参数,参数格式是map形式
if (invocation.getArgs().length > 1) {
parameter = invocation.getArgs()[1];
log.info("printSqlInterceptor parameter:" + parameter);
}
// 获取到节点的id,即sql语句的id
String sqlId = mappedStatement.getId();
log.info("printSqlInterceptor sqlId:" + sqlId);
List<String> printSqlMapperIdList = getPrintSqlMapperIdList();
String evnInfo = getEvnInfo();
if (ENV_PROD.equals(evnInfo) && printSqlMapperIdList.contains(sqlId)) {
printSql(mappedStatement, parameter, sqlId);
} else if (!ENV_PROD.equals(evnInfo)) {
printSql(mappedStatement, parameter, sqlId);
}
} catch (Exception e) {
log.info("printSqlInterceptor intercept error", e);
}
// 执行完上面的任务后,不改变原有的sql执行过程
return invocation.proceed();
}
private void printSql(MappedStatement mappedStatement, Object parameter, String sqlId) {
// BoundSql就是封装myBatis最终产生的sql类
BoundSql boundSql = mappedStatement.getBoundSql(parameter);
// 获取节点的配置
Configuration configuration = mappedStatement.getConfiguration();
// 获取到最终的sql语句
String sql = getSql(configuration, boundSql, sqlId);
log.info("printSqlInterceptor completeSqlInfo:" + sql);
}
/**
* 封装了一下sql语句,使得结果返回完整xml路径下的sql语句节点id + sql语句
*
* @param configuration
* @param boundSql
* @param sqlId
* @return
*/
public static String getSql(Configuration configuration, BoundSql boundSql, String sqlId) {
String sql = showSql(configuration, boundSql);
return sqlId + ":" + sql;
}
/**
* 如果参数是String,则添加单引号, 如果是日期,则转换为时间格式器并加单引号; 对参数是null和不是null的情况作了处理
*
* @param obj
* @return
*/
private static String getParameterValue(Object obj) {
String value;
if (obj instanceof String) {
value = "'" + obj.toString() + "'";
} else if (obj instanceof Date) {
value = "'" + FORMATTER.format((Date) obj) + "'";
} else {
if (obj != null) {
value = obj.toString();
} else {
value = "";
}
}
return value;
}
/**
* 进行?的替换
*
* @param configuration
* @param boundSql
* @return
*/
public static String showSql(Configuration configuration, BoundSql boundSql) {
// 获取参数
Object parameterObject = boundSql.getParameterObject();
List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
// sql语句中多个空格都用一个空格代替
String sql = boundSql.getSql().replaceAll("[\\s]+", " ");
if (CollectionUtils.isNotEmpty(parameterMappings) && parameterObject != null) {
// 获取类型处理器注册器,类型处理器的功能是进行java类型和数据库类型的转换
TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
// 如果根据parameterObject.getClass()可以找到对应的类型,则替换
if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
sql = sql.replaceFirst("\\?",
Matcher.quoteReplacement(getParameterValue(parameterObject)));
} else {
// MetaObject主要是封装了originalObject对象,提供了get和set的方法用于获取和设置originalObject的属性值,主要支持对JavaBean、Collection、Map三种类型对象的操作
MetaObject metaObject = configuration.newMetaObject(parameterObject);
for (ParameterMapping parameterMapping : parameterMappings) {
String propertyName = parameterMapping.getProperty();
if (metaObject.hasGetter(propertyName)) {
Object obj = metaObject.getValue(propertyName);
sql = sql.replaceFirst("\\?",
Matcher.quoteReplacement(getParameterValue(obj)));
} else if (boundSql.hasAdditionalParameter(propertyName)) {
// 该分支是动态sql
Object obj = boundSql.getAdditionalParameter(propertyName);
sql = sql.replaceFirst("\\?",
Matcher.quoteReplacement(getParameterValue(obj)));
} else {
// 打印出缺失,提醒该参数缺失并防止错位
sql = sql.replaceFirst("\\?", "缺失");
}
}
}
}
return sql;
}
@Override
public Object plugin(Object target) {
return Plugin.wrap(target, this);
}
@Override
public void setProperties(Properties properties) {
}
}
打印结果集和SQL耗时拦截器
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.springframework.core.env.Environment;
import org.springframework.util.ObjectUtils;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Properties;
import java.util.stream.Collectors;
@Slf4j
@Intercepts({@Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class})})
public class MybatisResultInterceptor extends BaseMybatisInterceptor implements Interceptor {
@Override
public Object intercept(Invocation invocation) throws Throwable {
// 执行请求方法,并将所得结果保存到result中
long start = System.currentTimeMillis();
Object result = invocation.proceed();
long end = System.currentTimeMillis();
MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
String sqlId = mappedStatement.getId();
printResultAndCost(result, sqlId, end - start);
return result;
}
private void printResultAndCost(Object result, String sqlId, long cost) {
String evnInfo = getEvnInfo();
List<String> printSqlResultMapperIdList = getPrintSqlResultMapperIdList();
if (ENV_PROD.equals(evnInfo) && printSqlResultMapperIdList.contains(sqlId)) {
log.info("printResultInterceptor printResult:{},cost:{},{}", sqlId, cost, JSON.toJSONString(result));
} else if (!ENV_PROD.equals(evnInfo)) {
log.info("printResultInterceptor printResult:{},cost:{},{}", sqlId, cost, JSON.toJSONString(result));
}
}
private List<String> getPrintSqlResultMapperIdList() {
//自行配置需要打印结果集的sqlId
String printSqlResultMapperIdStr = getEnvironment().getProperty("printSqlResultMapperIdStr");
if (!ObjectUtils.isEmpty(printSqlResultMapperIdStr)) {
return Arrays.stream(printSqlResultMapperIdStr.split(SPLITTER_COMMA)).collect(Collectors.toList());
}
return new ArrayList<>();
}
@Override
public Object plugin(Object target) {
return Plugin.wrap(target, this);
}
@Override
public void setProperties(Properties arg0) {
}
}
上述两个拦截器涉及到的类
import org.springframework.core.env.Environment;
public class BaseMybatisInterceptor {
protected static final String SPLITTER_COMMA = ",";
protected static final String ENV_DEV = "dev";
protected static final String ENV_TEST = "test";
protected static final String ENV_PROD = "prod";
protected String getEvnInfo() {
String evnInfo = null;
String[] profiles = ContextUtil.getAc().getEnvironment().getActiveProfiles();
for (String profile : profiles) {
if (profile.contains("dev")) {
evnInfo = ENV_DEV;
break;
} else if (profile.contains("test")) {
evnInfo = ENV_TEST;
} else {
evnInfo = ENV_PROD;
}
}
return evnInfo;
}
protected Environment getEnvironment() {
return ContextUtil.getAc().getEnvironment();
}
}
@Component
public class ContextUtils implements ApplicationContextAware {
private static ApplicationContext applicationContext;
@Override
public void setApplicationContext(ApplicationContext actx) throws BeansException {
applicationContext = actx;
}
public static ApplicationContext getApplicationContext() {
return applicationContext;
}
}
基于XML配置
在mybatis配置文件里面添加下面的配置
<plugins>
<plugin interceptor="xx.xx.MybatisResultInterceptor"></plugin>
<plugin interceptor="xx.xx.MybatisSqlInterceptor"></plugin>
</plugins>
零XML配置
在pom文加引入mybatis-spring-boot-starter
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.4</version>
</dependency>
配置拦截器
@Configuration
public class MyBatisConfig {
@Autowired
private List<SqlSessionFactory> sqlSessionFactoryList;
@PostConstruct
public void addMyInterceptor() {
for (SqlSessionFactory sqlSessionFactory : sqlSessionFactoryList) {
sqlSessionFactory.getConfiguration().addInterceptor(new MybatisSqlInterceptor());
sqlSessionFactory.getConfiguration().addInterceptor(new MybatisResultInterceptor());
}
}
}
注意
如果你的项目没有引入Mybatis分页插件(如 PageHelper),那么经过上面的配置之后就大功告成了。
如果你的项目有类似PageHelper这种分页插件,那么上述的配置并不能使拦截器生效。具体的原因和解决方式请参考 解决PageHelper使Mybatis自定义拦截器失效