我在订购我正在通过ORMLite查询的对象列表时出现问题，我希望通过2个单独的列进行排序。我想按优先顺序排列最低，计数最高。然而，似乎查询只接受我设置的最后一个orderBy而不是两者。例如，这里有两个查询及其结果：
QueryBuilder<CategoryData, Integer> queryBuilder4 = dao.queryBuilder();
queryBuilder4.orderBy(CategoryData.FACE_COUNT_COLUMN_NAME, false);
queryBuilder4.orderBy(CategoryData.PRIORITY_COLUMN_NAME, true);
Log.d(TAG, "4 Query returns:"+ queryBuilder4.query().toString());
它的输出：
name=Blues, db=158, count=3, priority=1, firstLookDbID=6
name=Greens, db=165, count=3, priority=8, firstLookDbID=9
name=Blacks, db=157, count=1, priority=0, firstLookDbID=2,...
第二个代码块：
QueryBuilder<CategoryData, Integer> queryBuilder5 = dao.queryBuilder();
queryBuilder5.orderBy(CategoryData.PRIORITY_COLUMN_NAME, true);
queryBuilder5.orderBy(CategoryData.FACE_COUNT_COLUMN_NAME, false);
Log.d(TAG, "5 Query returns:"+ queryBuilder5.query().toString());
它的输出：
name=Blacks, db=157, count=1, priority=0, firstLookDbID=2
name=Blues, db=158, count=3, priority=1, firstLookDbID=6
...
name=Greens, db=165, count=3, priority=8, firstLookDbID=9...
请注意，两个查询之间的唯一区别是我下订单的顺序。然而，他们给了我2个不同的有序集。
答案 0 :(得分：0)
您的第一个查询（queryBuilder4）以后代方式按FACE_COUNT_COLUMN_NAME对结果进行排序，如果存在相同的值，在这种情况下为“count = 3”，则查询使用PRIORITY_COLUMN_NAME按顺序在“优先级”中对结果进行排序方式。
第二个查询（queryBuilder5）以优先方式按PRIORITY_COLUMN_NAME排序结果，但在“优先级”中不存在相同的值，因此FACE_COUNT_COLUMN_NAME＆＃34;顺序为＃34;被忽略，结果与第一个查询不同。
答案 1 :(得分：0)
请注意，两个查询之间的唯一区别是我下订单的顺序。然而，他们给了我2个不同的有序集。
右。这是预期的行为。在SQL中，remote: [INFO] Copying guava-12.0.jar to /tmp/build_4959660edbd9bc2e826e322947728edc/target/dependency/guava-12.0.jar
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子句按特定顺序处理。引用QueryBuilder.orderby(...) javadocs强调：
将“ORDER BY”子句添加到SQL查询语句中。这可以被多次调用以添加额外的“ORDER BY”子句。 先前使用的是。
因此，在第一个实例中，clc
clear all
W=cell(16,1);
for g=1:16;
temp = zeros(3,3);
for m=1:3
for n=1:3
temp (m,n) = exp((2*pi*1i*m/4)* n+g/16);
end
end
W{g} = temp;
end
首先按降序排序。如果计数相等，则ORDER BY按升序排序。在第二个中，优先级首先按升序排序。如果优先级相等，则计数按降序排列。