我正在使用spring框架和mongoTemplate。 bean 启动:
public
@Bean
MongoTemplate mongoTemplate() throws Exception {
MongoTemplate mongoTemplate = new MongoTemplate(mongoDbFactory());
mongoTemplate.setWriteResultChecking(WriteResultChecking.EXCEPTION);
return mongoTemplate;
}
简而言之，此代码不会因重复键而失败
collection= mTemplate.getCollection("col");
try {
final WriteResult writeResult = collection.insert(edge);
} catch (DuplicateKeyException e) {
log.warn("@error> edge already exists");
return null;
}
writeResult._lastErrorResult 不为 null，并且有相关错误。
我要插入的文档:
我也 try catch Exception e但没有成功。
collection.createIndex(new BasicDBObject("a", 1).append(, 1), unique);
DbObject edge = new BasicDBObject("a", "123").append("b", "345");
最佳答案
您需要将 MongoDB 驱动程序的 WriteConcern 设置为 Acknowledged .
来自文档，
Write operations that use this write concern will wait for acknowledgement from the primary server before returning. Exceptions are raised for network issues, and server errors.
关于java mongodb 驱动程序在重复键上不会引发异常，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27661376/