将WHERE逻辑转换为SQL语句

如何解决将WHERE逻辑转换为SQL语句

| 有人可以帮助我将以下代码转换为原始SQL语句吗？ （不适用于动态SQL）

Dim blnAllow as Boolean = True

Dim intType as Int32 = 35

.Append(\"SELECT * FROM TABLE1 WHERE NAME=\'AAA\' \")

Select Case intType

                    Case 35
                        .Append(\"AND (Type IN (2,4) OR type=8) \")
                        .Append(\"AND [use]=1 \")
                    Case 34
                        If blnAllow = True Then
                            .Append(\"AND (Type IN (2,4) OR (type=8 and Col1 > 0 )) \")
                        Else
                            .Append(\"AND (Type IN (2,4)) \")
                        End If
                        .Append(\" AND [use]=1 \")
                    Case Else
                        .Append(\"AND Type=1\")
End Select

    

解决方法

        好吧，因为

intType

被定义为35，所以只有Case 35部分适用...

select * from TABLE1 where [NAME]=\'AAA\'
    and [Type] in (2,4,8)
    and [use] = 1

如果要封装其他情况，则必须说明intType适合的位置。还是只需要3个单独的查询？     ,        这样的事情怎么样

SELECT  * 
FROM    TABLE1 WHERE NAME=\'AAA\'
AND     (
            (
                    intType = 35
                AND (Type IN (2,4) OR type=8)
                AND [use]=1
            )
            OR
            (
                    intType = 34
                AND (
                        (
                                blnAllow = \'true\'
                            AND (Type IN (2,4) OR (type=8 and Col1 > 0 )) 
                        )
                        OR
                        (
                                blnAllow = \'false\'
                            AND (Type IN (2,4)) 
                        )
                    )
                AND [use]=1
            )
            OR
            (
                    intType NOT IN (35,34)
                AND Type=1
            )
        )

    ,        一般的转换模式是

If condition Then ands1
Else ands2 End If

变成

( (condition AND ands1) OR ((NOT condition) AND ands2) )

    ,        请尝试最优化的查询。

select * from table where name = \'AAA\' AND
    (
        (
            ((Type IN (2,4) OR type=8) OR // Case 35
                (       
                    (Type IN (2,4) OR (type=8 and Col1 > 0 )) // Case 34 and blnAllow checking
                )
            )
            AND [use]=1 // Case 35 && 34
        ) OR     
        (Type=1) // Else
    )

If the string \"Type\" and \"type\" indicates the same field,You just modifify the 
//case 35 section to (Type IN (2,4) OR type=8) => (Type IN (2,8))

    ,        在MS SQL中，如下所示：

DECLARE @blnAllow BIT
SET @blnAllow = 1

DECLARE @intType INT
SET @intType = 35

SELECT * 
FROM TABLE1 
WHERE 
    NAME = \'AAA\' AND
    (
        (@intType = 35 AND (Type IN (2,4) OR type = 8) AND [use] = 1) OR
        (@intType = 34 AND [use] = 1  AND
            (
                (@blnAllow = 1 AND (Type IN (2,4) OR (type = 8 and Col1 > 0 ))) OR
                (@blnAllow = 0 AND (Type IN (2,4)))
            )) OR
        (@intType not in (34,35) AND Type = 1)
    )

不要期望查询优化器对其进行优化：)。     ,        

…
WHERE NAME = \'AAA\'
  AND (@intType NOT IN (34,35) AND Type = 1
    OR @intType IN (34,35) AND [use] = 1 AND (
         Type IN (2,4)
      OR @intType = 35 AND Type = 8
      OR @intType = 34 AND (@blnAllow = 0 OR Type = 8 AND Col1 > 0)
    )
  )

假设

@intType

是

int

参数，

@blnAllow

是

bit

参数。