embedded sql in c,如何检查记录是否存在
embedded sql in c,how to check if records exist
我试过这些:
1.if (EXEC SQL EXIST SELECT ...)
2.EXEC SQL IF EXIST SELECT ...
但是 none 这些工作,有帮助吗?
Select 计数并检查它是否为零。沿着这条线:
int a;
EXEC SQL SELECT count(*) INTO :a
FROM some_table
WHERE some_condition;
if (a != 0)...
我试过这些:
1.if (EXEC SQL EXIST SELECT ...)
2.EXEC SQL IF EXIST SELECT ...
但是 none 这些工作,有帮助吗?
Select 计数并检查它是否为零。沿着这条线:
int a;
EXEC SQL SELECT count(*) INTO :a
FROM some_table
WHERE some_condition;
if (a != 0)...