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单列计算SUM
我使用的是最新版本的DBFLOW
库,我尝试计算总和单列作为countOfNewPosts
与DbFlow
这是我的表:
public class CafeWebNewPostInformation extends BaseModel {
@PrimaryKey
@Column
public int id;
@Column
public int cafeWebServerId;
@Column
public int countOfNewPosts;
@Column
@ForeignKey(tableClass = AlachiqCafeWebs.class,
references = @ForeignKeyReference(columnName = "parentId", foreignKeyColumnName = "id"))
private int parentId;
@Column
public int lastSavedId;
@Column
public int lastRequestedId;
@Column
public int lastRetrievedId;
}
,这是我的代码来获得,从这个表:
CafeWebNewPostInformation countOfNewPost =
SQLite.select(
Method.sum(CafeWebNewPostInformation_Table.countOfNewPosts).as("count")
)
.from(CafeWebNewPostInformation.class).querySingle();
我没有得到任何错误,这是这一结果:
截图:
发生什么和在哪里count
这个结果?