这篇文章主要介绍“如何使用mybatis的interceptor修改执行sql和传入参数”，在日常操作中，相信很多人在如何使用mybatis的interceptor修改执行sql和传入参数问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”如何使用mybatis的interceptor修改执行sql和传入参数”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
项目中途遇到业务需求更改，在查询某张表时需要增加条件，由于涉及的sql语句多而且依赖其他服务的jar，逐个修改sql语句和接口太繁杂。项目使用mybatis框架，因此借鉴PageHelper插件尝试使用mybatis的Interceptor来实现改需求。
从BoundSql中获取sql，通过正则匹配替换表名为子查询REPLACE_TXT
添加子查询REPLACE_TXT 中需要用到的参数到mybatis参数列表中
添加参数与占位符映射，即添加ParameterMapping对象到ParameterMappings中，由于statement在执行时是按照ParameterMappings的元素索引定位占位符封装参数（即ParameterMappings中的第一个参数会封装到第一个占位符上），因此ParameterMappings中的参数顺序需要和占位符保持一致。其次ParameterMappings的元素个数需要和占位符个数保持一致。
为了保证该intercept在最后执行，使用AutoConfiguration将intercept添加到SqlSessionFactory的Configuration中，并在spring.factories文件中添加AutoConfiguration
未测试性能以及是否存在未知缺陷
package org.cnbi.project.other.sql.intercept;
import cn.hutool.core.util.NumberUtil;
import com.cnbi.cloud.common.core.exception.ServiceException;
import com.github.pagehelper.Page;
import com.github.pagehelper.util.ExecutorUtil;
import com.github.pagehelper.util.MetaObjectUtil;
import org.apache.ibatis.builder.annotation.ProviderSqlSource;
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.plugin.*;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.cnbi.project.other.sql.aop.PeriodHolder;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* @ClassName ParamInterceptor
* @Description 修改接口太繁琐，直接用mybatis拦截器对查询sql进行拦截，将期间参数注入sql
* @Author Wangjunkai
* @Date 2019/10/23 11:36
**/
@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})
}
)
public class ParamInterceptor implements Interceptor {
private final static Pattern DW_DIMCOMPANY = Pattern.compile("dw_dimcompany", Pattern.CASE_INSENSITIVE);
private final static String REPLACE_TXT = "(select * from dw_dimcompany where cisdel = '0' and START_PERIOD <= ? and END_PERIOD > ?)";
@Override
public Object intercept(Invocation invocation) throws Throwable {
Object[] args = invocation.getArgs();
MappedStatement ms = (MappedStatement) args[0];
Object parameter = args[1];
RowBounds rowBounds = (RowBounds) args[2];
ResultHandler resultHandler = (ResultHandler) args[3];
Executor executor = (Executor) invocation.getTarget();
CacheKey cacheKey;
BoundSql boundSql;
if(args.length == 4){
boundSql = ms.getBoundSql(parameter);
} else {
boundSql = (BoundSql) args[5];
}
//获取sql语句，使用正则忽略大小写匹配
String sql = boundSql.getSql();
Matcher matcher = DW_DIMCOMPANY.matcher(sql);
//没有需要替换的表名则放行
if(!matcher.find()){
return invocation.proceed();
}
//收集占位符个数（即paramIndex 的size）以及占位符次序（slot：即参数在ParameterMappings中的顺序）
int index = 0;
ArrayList<Integer> paramIndex = new ArrayList<>();
while(matcher.find(index)){
index = matcher.end();
String sqlPart = sql.substring(0, index);
int slot = index - sqlPart.replace("?", "").length() + paramIndex.size() ;
paramIndex.add(slot);
paramIndex.add(slot + 1);
}
//替换子查询
String companyPeriodSql = matcher.replaceAll(REPLACE_TXT);
cacheKey = args.length == 4 ? executor.createCacheKey(ms, parameter, rowBounds, boundSql) : (CacheKey) args[4];
//处理参数
Object parameterObject = processParameterObject(ms, parameter, boundSql, cacheKey, paramIndex);
BoundSql companyPeriodBoundSql = new BoundSql(ms.getConfiguration(), companyPeriodSql, boundSql.getParameterMappings(), parameterObject);
Map<String, Object> additionalParameters = ExecutorUtil.getAdditionalParameter(boundSql);
//设置动态参数
for (String key : additionalParameters.keySet()) {
companyPeriodBoundSql.setAdditionalParameter(key, additionalParameters.get(key));
}
return executor.query(ms, parameterObject, RowBounds.DEFAULT, resultHandler, cacheKey, companyPeriodBoundSql);
}
public Object processParameterObject(MappedStatement ms, Object parameterObject, BoundSql boundSql, CacheKey pageKey, ArrayList<Integer> paramIndex) {
//处理参数
Map<String, Object> paramMap = null;
if (parameterObject == null) {
paramMap = new HashMap<>();
} else if (parameterObject instanceof Map) {
//解决不可变Map的情况
paramMap = new HashMap<>();
paramMap.putAll((Map) parameterObject);
} else {
paramMap = new HashMap<>();
// sqlSource为ProviderSqlSource时，处理只有1个参数的情况
if (ms.getSqlSource() instanceof ProviderSqlSource) {
String[] providerMethodArgumentNames = ExecutorUtil.getProviderMethodArgumentNames((ProviderSqlSource) ms.getSqlSource());
if (providerMethodArgumentNames != null && providerMethodArgumentNames.length == 1) {
paramMap.put(providerMethodArgumentNames[0], parameterObject);
paramMap.put("param1", parameterObject);
}
}
//动态sql时的判断条件不会出现在ParameterMapping中，但是必须有，所以这里需要收集所有的getter属性
//TypeHandlerRegistry可以直接处理的会作为一个直接使用的对象进行处理
boolean hasTypeHandler = ms.getConfiguration().getTypeHandlerRegistry().hasTypeHandler(parameterObject.getClass());
MetaObject metaObject = MetaObjectUtil.forObject(parameterObject);
//需要针对注解形式的MyProviderSqlSource保存原值
if (!hasTypeHandler) {
for (String name : metaObject.getGetterNames()) {
paramMap.put(name, metaObject.getValue(name));
}
}
//下面这段方法，主要解决一个常见类型的参数时的问题
if (boundSql.getParameterMappings() != null && boundSql.getParameterMappings().size() > 0) {
for (ParameterMapping parameterMapping : boundSql.getParameterMappings()) {
String name = parameterMapping.getProperty();
if (!name.equals(GLOBALPERIOD)
&& paramMap.get(name) == null) {
if (hasTypeHandler
|| parameterMapping.getJavaType().equals(parameterObject.getClass())) {
paramMap.put(name, parameterObject);
break;
}
}
}
}
}
return processPageParameter(ms, paramMap, boundSql, pageKey, paramIndex);
}
private final static String GLOBALPERIOD = "globalPeriod";
public Object processPageParameter(MappedStatement ms, Map<String, Object> paramMap, BoundSql boundSql, CacheKey pageKey, ArrayList<Integer> paramIndex) {
paramMap.put(GLOBALPERIOD, getPeriod());
//处理pageKey
pageKey.update(getPeriod());
//处理参数配置
handleParameter(boundSql, ms, paramIndex);
return paramMap;
}
protected void handleParameter(BoundSql boundSql, MappedStatement ms, ArrayList<Integer> paramIndex) {
if (boundSql.getParameterMappings() != null) {
List<ParameterMapping> newParameterMappings = new ArrayList<>(boundSql.getParameterMappings());
for (Integer index : paramIndex) {
if(index < newParameterMappings.size()) {
newParameterMappings.add(index, new ParameterMapping.Builder(ms.getConfiguration(), GLOBALPERIOD, String.class).build());
}else{
newParameterMappings.add(new ParameterMapping.Builder(ms.getConfiguration(), GLOBALPERIOD, String.class).build());
}
}
MetaObject metaObject = MetaObjectUtil.forObject(boundSql);
metaObject.setValue("parameterMappings", newParameterMappings);
}
}
private final static String Q = "Q";
private final static String H = "H";
private String getPeriod(){
//使用threadlocal保存从request中获取的参数，此处不再描述
String period = PeriodHolder.getPeriod();
if(NumberUtil.isNumber(period)){
return period;
}else if(period.contains(Q)){
return period.substring(0, 4) + Integer.parseInt(period.substring(5)) * 3;
}else if(period.contains(H)){
return period.substring(0, 4) + Integer.parseInt(period.substring(5)) * 6;
}else{
throw new ServiceException("非法期间:" + period);
}
}
@Override
public Object plugin(Object target) {
return Plugin.wrap(target, this);
}
@Override
public void setProperties(Properties properties) {
//nothing to do...
}
}package org.cnbi.project.autoconfig;
import com.github.pagehelper.autoconfigure.PageHelperAutoConfiguration;
import org.apache.ibatis.session.SqlSessionFactory;
import org.cnbi.project.other.sql.intercept.ParamInterceptor;
import org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.context.annotation.Configuration;
import javax.annotation.PostConstruct;
import java.util.Iterator;
import java.util.List;
/**
* @ClassName ParamIntecepterAutoConfiguration
* @Description
* @Author Wangjunkai
* @Date 2019/10/23 15:41
**/
@AutoConfigureAfter({MybatisAutoConfiguration.class, PageHelperAutoConfiguration.class})
@Configuration
public class ParamIntecepterAutoConfiguration {
@Autowired
private List<SqlSessionFactory> sqlSessionFactoryList;
public ParamIntecepterAutoConfiguration() {
}
@PostConstruct
public void addParamInterceptor() {
ParamInterceptor interceptor = new ParamInterceptor();
Iterator var3 = this.sqlSessionFactoryList.iterator();
while(var3.hasNext()) {
SqlSessionFactory sqlSessionFactory = (SqlSessionFactory)var3.next();
sqlSessionFactory.getConfiguration().addInterceptor(interceptor);
}
}
}处理查询参数及返回结果。
/**
* Created by windwant on 2017/1/12.
*/
@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 EncryptInterceptor implements Interceptor {
public static final Logger logger = LoggerFactory.getLogger(EncryptInterceptor.class);
@Override
public Object intercept(Invocation invocation) throws Throwable {
dealParameter(invocation);
Object returnValue = invocation.proceed();
dealReturnValue(returnValue);
return returnValue;
}
//查询参数加密处理
private void dealParameter(Invocation invocation) {
MappedStatement statement = (MappedStatement) invocation.getArgs()[0];
String mapperl = ConfigUtils.get("mybaits.mapper.path");
String methodName = statement.getId().substring(statement.getId().indexOf(mapperl) + mapperl.length() + 1);
if (methodName.startsWith("UserBaseMapper")){
if(methodName.equals("UserBaseMapper.updateDriver")){
((Driver) invocation.getArgs()[1]).encrypt();
}
}
logger.info("Mybatis Encrypt parameters Interceptor, method: {}, args: {}", methodName, invocation.getArgs()[1]);
}
//查询结果解密处理
private void dealReturnValue(Object returnValue){
if(returnValue instanceof ArrayList<?>){
List<?> list = (ArrayList<?>)returnValue;
for(Object val: list){
if(val instanceof Passenger){///
//TODO
}
logger.info("Mybatis Decrypt result Interceptor, result object: {}", ToStringBuilder.reflectionToString(val));
}
}
}
@Override
public Object plugin(Object target) {
return Plugin.wrap(target, this);
}
@Override
public void setProperties(Properties properties) {
}
}<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="typeAliasesPackage" value="com.xx.model"/> <property name="dataSource" ref="dataSource"/> <!-- 自动扫描mapping.xml文件 --> <property name="mapperLocations" value="classpath*:mybatis/*.xml"></property> <property name="plugins">//拦截器插件 <array> <bean class="com.github.pagehelper.PageHelper"> <property name="properties"> <value>dialect=hsqldb</value> </property> </bean> <bean class="com.xx.interceptor.EncryptInterceptor"> <property name="properties"> <value>property-key=property-value</value> </property> </bean> </array> </property> </bean>
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