Question

我有三种不同的类型1、2、3。

类型1与tableA关联类型2与tableB关联类型3与tableC相关联

现在，我必须运行以下查询：

Alter procedure TestProc @variableType int
As
begin
   if @variableType = 'A' then 
   -- use tableA else tableB

   IF NOT EXISTS (Select field from tableA)
   print "hello"
end

已编辑： 更改后的实际查询现在看起来像这样：

if not exists(SELECT a.InstrumentId FROM tblARadiationLicenceRenewal a, tblA WHERE 
                            a.RenewalStatusID <> 790 AND a.InstrumentID = 5051747
                            AND a.LicenceExpiryDate = tblA.ExpiryDate
                            union
                            SELECT a.InstrumentID FROM tblRadiationLicenceRenewal a, tblB WHERE 
                            a.RenewalStatusID <> 790 AND a.InstrumentID = 5051747
                            AND a.LicenceExpiryDate = tblB.ExpiryDate
                            union
                            SELECT a.InstrumentID FROM tblRadiationLicenceRenewal a, tblC WHERE 
                            a.RenewalStatusID <> 790 AND a.InstrumentID = 5051747
                            AND a.LicenceExpiryDate = tblC.ExpiryDate)
                            -- PRINT 'HELLO WORLD' (THERE ARE LONG QUERIES AND STORED PROCEDURE RUNNING HERE

如何动态更改表名。

Answer 1

您只需要替换if，就可以做到，而不必担心动态sql：

Alter procedure TestProc @variableType int
As
if @variableType = 'A' then 
begin
   -- use tableA

   IF NOT EXISTS (Select field from tableA)
   print "hello"
end 
else if @variableType = 'B' then 
   begin
   -- use tableB

   IF NOT EXISTS (Select field from tableB)
   print "hello"
end

等等...这是SQL存储过程中条件的基本方法。您可以在网上找到许多不同的方法。

Answer 2

过程的语法如下-

CREATE PROCEDURE TestProc   @variableType INT
AS
BEGIN
    IF @variableType = 1 
    BEGIN
        IF NOT EXISTS ( SELECT Your_Field FROM   tableA)
        PRINT 'Hello from table A'
    END

    ELSE IF @variableType = 2 
    BEGIN
        IF NOT EXISTS ( SELECT Your_Field FROM   tableB)
        PRINT 'Hello from table B'
    END

    ELSE
    BEGIN
        IF NOT EXISTS ( SELECT Your_Field FROM   tableC)
        PRINT 'Hello from table C'
    END
END

基于类型的动态表名称

2 个答案: