Question

我有这个linq代码，我需要将其转换为相同的SQL，以便我可以直接查询数据库...当它变得复杂时我会陷入困境。有人可以帮忙吗？

LINQ的

_db.BatchPaymentSplits
    .Where(bps => bps.YearSetupId == i.YearSetupId)
    .Where(bps => bps.CustomerIdEntered != null)
    .Where(bps => _db.BatchPayments
        .Where(bp => _db.Batches.Where(b => b.BatchTypeId.Equals("T"))
                                .Select(b => b.BatchId)
                                .Contains(bp.BatchId)
        )
        .Select(bp => bp.BatchPaymentId).Contains(bps.BatchPaymentId)
    )

到目前为止

SQL

SELECT * FROM BatchPaymentSplit
WHERE YearSetupId = 1
AND CustomerIdEntered IS NOT NULL

Answer 1

我不能说我认为LINQ或结果SQL是表达此查询的最佳方式（我应该使用Join），但这是我的直译：

SELECT *
FROM BatchPaymentSplits bps
WHERE bps.YearSetupId = i.YearSetupId AND
      bps.CustomerIdEntered IS NOT NULL AND
      EXISTS (SELECT * FROM BatchPayments bp
              WHERE EXISTS (SELECT * FROM Batches b
                            WHERE b.BatchTypeId = 'T' AND
                                  b.BatchId = bp.BatchId) AND
                    bp.BatchPaymentId = bps.BatchPaymentId)

您可以在Contains / IEnumerable作为IQueryable查询时使用EXISTS表达式翻译=。

将此Linq转换为SQL

1 个答案: