问题描述
我正在查询 java 中的 NULL 值(在 cosmos 文档数据库上)但它抛出错误,下面是语法:
import com.azure.cosmos.models.CosmosQueryRequestOptions;
import com.azure.spring.data.cosmos.core.generator.FindQuerySpecGenerator;
import com.azure.cosmos.models.SqlQuerySpec;
import com.azure.spring.data.cosmos.core.query.CosmosQuery;
import com.azure.spring.data.cosmos.core.query.Criteria;
import com.azure.spring.data.cosmos.core.query.CriteriaType;
import org.springframework.data.repository.query.parser.Part;
import java.util.Arrays;
Criteria criteria = Criteria.getInstance(CriteriaType.IS_EQUAL,"tripId",new ArrayList(Arrays.asList(null)),Part.IgnoreCaseType.NEVER);
CosmosQuery documentQuery = new CosmosQuery(criteria);
SqlQuerySpec sqlQuerySpec = new FindQuerySpecGenerator().generateCosmos(documentQuery);
这里是例外: 线程“main”中的异常 java.lang.NullPointerException 在 java.util.Objects.requireNonNull(Objects.java:203) 在 java.util.Arrays$ArrayList.(Arrays.java:3813) 在 java.util.Arrays.asList(Arrays.java:3800)
解决方法
解决方案:
ArrayList<Object> emptyList= new ArrayList<Object>();
Criteria criteria = Criteria.getInstance(CriteriaType.IS_NULL,"tripId",emptyList,Part.IgnoreCaseType.NEVER);
CosmosQuery documentQuery = new CosmosQuery(criteria);
SqlQuerySpec sqlQuerySpec = new FindQuerySpecGenerator().generateCosmos(documentQuery);