mybatis多条件in查询拓展

背景

最近碰上有个业务，查询的sql如下：

select * from table where (sku_id,batch_no) in ((#{skuId},#{batchNo}),...); 

本来也没什么，很简单常见的一种sql。问题是我们使用的是mybatis-plus，然后写的时候又没有考虑到后面的查询条件，这里用的是mybatis-plus lambda的方式。

LambdaQueryChainWrapper<Table> query = tableService.lambdaQuery();  
query.eq(Table::getId, param.getId()); 

但是mysql-plus并没有支持这种sql的形式，要么用apply方法自定义拼接sql，要么不采用lambda方式，将语句写成 xml 形式。

不过，第一种方式感觉很 low，一大段 java 代码里插入一段sql字符串，看上去就很别扭，因为有点代码洁癖，只能果断放弃。

第二种改动又太大，前面那么多查询条件，又要全部移入xml里面，同时，本来已经通过测试的筛选条件，又要重新来一遍，太懒，实在干不动了。

想想这么常见的场景，网上理应有现成的解决方案。但不知道是搜索关键字不对还是确实没有，搜了半天没搜出来。

最后无奈，只能尝试自己扩展一下。

代码

import com.baomidou.mybatisplus.core.conditions.AbstractLambdaWrapper;
import com.baomidou.mybatisplus.core.conditions.ISqlSegment;
import com.baomidou.mybatisplus.core.conditions.segments.MergeSegments;
import com.baomidou.mybatisplus.core.metadata.TableFieldInfo;
import com.baomidou.mybatisplus.core.toolkit.ArrayUtils;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.core.toolkit.TableInfoHelper;
import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
import io.vavr.Tuple;
import org.springframework.util.Assert;import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Predicate;
import java.util.stream.Collectors;import static com.baomidou.mybatisplus.core.enums.SqlKeyword.IN;
import static java.util.stream.Collectors.joining;public class CombinationLambdaQueryChainWrapper<T> extends AbstractLambdaWrapper<T, CombinationLambdaQueryChainWrapper<T>> {/*** 查询字段*/private String sqlSelect;public CombinationLambdaQueryChainWrapper() {this(null);}public CombinationLambdaQueryChainWrapper(T entity) {this.entity = entity;this.initEntityClass();this.initNeed();}CombinationLambdaQueryChainWrapper(T entity, Class<T> entityClass, String sqlSelect, AtomicInteger paramNameSeq, Map<String, Object> paramNameValuePairs,MergeSegments mergeSegments) {this.entity = entity;this.paramNameSeq = paramNameSeq;this.paramNameValuePairs = paramNameValuePairs;this.expression = mergeSegments;this.sqlSelect = sqlSelect;this.entityClass = entityClass;}/*** <p>* SELECT 部分 SQL 设置* </p>** @param columns 查询字段*/@SafeVarargspublic final CombinationLambdaQueryChainWrapper<T> select(SFunction<T, ?>... columns) {if (ArrayUtils.isNotEmpty(columns)) {this.sqlSelect = this.columnsToString(columns);}return typedThis;}public CombinationLambdaQueryChainWrapper<T> select(Predicate<TableFieldInfo> predicate) {return select(entityClass, predicate);}/*** <p>* 过滤查询的字段信息(主键除外!)* </p>* <p>* 例1: 只要 java 字段名以 "test" 开头的              -> select(i -> i.getProperty().startsWith("test"))* 例2: 只要 java 字段属性是 CharSequence 类型的       -> select(TableFieldInfo::isCharSequence)* 例3: 只要 java 字段没有填充策略的                   -> select(i -> i.getFieldFill == FieldFill.DEFAULT)* 例4: 要全部字段                                   -> select(i -> true)* 例5: 只要主键字段                                 -> select(i -> false)* </p>** @param predicate 过滤方式* @return this*/public CombinationLambdaQueryChainWrapper<T> select(Class<T> entityClass, Predicate<TableFieldInfo> predicate) {this.entityClass = entityClass;this.sqlSelect = TableInfoHelper.getTableInfo(getCheckEntityClass()).chooseSelect(predicate);return typedThis;}@Overridepublic String getSqlSelect() {return sqlSelect;}/*** <p>* 用于生成嵌套 sql* 故 sqlSelect 不向下传递* </p>*/@Overrideprotected CombinationLambdaQueryChainWrapper<T> instance(AtomicInteger paramNameSeq, Map<String, Object> paramNameValuePairs) {return new CombinationLambdaQueryChainWrapper<>(entity, entityClass, null, paramNameSeq, paramNameValuePairs, new MergeSegments());}/*** 组合IN查询* 此处引入元祖，需使用io.vavr包**/public CombinationLambdaQueryChainWrapper<T> combinationIn(boolean condition, List<Tuple> list, SFunction<T, ?>... columns) {Assert.isTrue(columns.length == list.get(0).arity(), "请检查组合IN查询参数长度");return doIt(condition,() -> StringPool.LEFT_BRACKET + columnsToString(columns) + StringPool.RIGHT_BRACKET,IN,inExpressionOfParam(list));}private ISqlSegment inExpressionOfParam(List<Tuple> list) {if (list.size() > 1000) {throw new RuntimeException("组合查询禁止超过1000条");}List<String> result = list.stream().map(m -> StringPool.LEFT_BRACKET + m.toSeq().asJava().stream().map(n -> n instanceof String ? StringPool.SINGLE_QUOTE + n + StringPool.SINGLE_QUOTE : String.valueOf(n)).collect(Collectors.joining(StringPool.COMMA)) + StringPool.RIGHT_BRACKET).collect(Collectors.toList());return () -> result.stream().collect(joining(StringPool.COMMA, StringPool.LEFT_BRACKET, StringPool.RIGHT_BRACKET));}}

使用示例

        productRelService.list(new CombinationLambdaQueryChainWrapper<ProductRel>().select(ProductRel::getLevelId).eq(ProductRel::getLevelId, "GBZ0555A0002").combinationIn(true, Arrays.asList(Tuple.of("91cf1c0f3b0bc46e0238dc33717dc88e", "GBZ0555A0002")), ProductRel::getProductUuid, ProductRel::getLevelId));productRelService.list(new CombinationLambdaQueryChainWrapper<ProductRel>().combinationIn(true, Arrays.asList(Tuple.of(1L, "GBZ0555A0002")), ProductRel::getId, ProductRel::getLevelId));