MondoDB Query failed with error code 2 and error message 'Projection cannot have a mix of inclusion
2018-01-12 00:00
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Java操作MongoDB限定返回字段的时候报错：MondoDB Query failed with error code 2 and error message 'Projection cannot have a mix of inclusion and exclusion.
以下是我的代码：
BasicDBObject fields = new BasicDBObject()
.append("_id", 0)
// .append("itemName", 1)
.append("usl", 0)
.append("lsl",0)
.append("unit",0)
.append("data", 0);
collection.find().projection(fields).forEach(printBlock);
原因：Projection 不允许 inclusion and exclusion混合使用，注释掉那一块就好了
以下是我的代码：
BasicDBObject fields = new BasicDBObject()
.append("_id", 0)
// .append("itemName", 1)
.append("usl", 0)
.append("lsl",0)
.append("unit",0)
.append("data", 0);
collection.find().projection(fields).forEach(printBlock);
原因：Projection 不允许 inclusion and exclusion混合使用，注释掉那一块就好了
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