I'm trying to create a function that takes the parameters for the column, the table, the limit, and offset. Basically, I want to be able to get a specified number of rows data from a specified table from a specified column.
However, I'm unable to get the following code to work - I get several errors such as:
syntax error, unexpected SELECT, expecting ':' in: "create function get_banana(lim int, off int, tbl varchar(32), col varchar(32)) r"
syntax error, unexpected RETURN in: "return"
syntax error, unexpected END in: "end"
These errors seem kind of meaningless.
My code is as follows:
CREATE FUNCTION GET_BANANA(lim int, off int, tbl varchar(32), col varchar(32))
RETURNS TABLE (clm int)
BEGIN
PREPARE SELECT col FROM tbl LIMIT ? OFFSET ?;
RETURN EXEC (lim, off);
END;
I'd appreciate any help :) Thanks!
I see at least two issues
EXEC
needs the identifier that is returned by PREPARE
, eg:
sql>prepare select * from tables; execute prepared statement using: EXEC 2(...) sql>exec 2();
The function parameters tbl
and col
are string values. You cannot use them as table/column identifiers.
Having said that, I am not even sure if PREPARE
can be used inside a function.
不,PREPARE是顶层语句修饰符。
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