db2动态游标声明

Question

I am trying to create a stored procedure, but I get this error

Expected tokens may include: "". LINE NUMBER=17. SQLSTATE=42601

My code:

CREATE OR REPLACE PROCEDURE FETCH_EMP_SP(IN V_EMP_NAME VARCHAR(100),IN V_EMP_DEPT VARCHAR(100))
DYNAMIC RESULT SETS 1
LANGUAGE SQL
BEGIN
DECLARE p_query_string  VARCHAR(100);
IF ((V_EMP_NAME IS NOT NULL) AND (V_EMP_DEPT IS NOT NULL)) THEN
    SET p_query_string = 'emp_name ='||V_EMP_NAME||' AND emp_dept='||V_EMP_DEPT||' WITH UR';
ELSEIF(V_EMP_DEPT IS NOT NULL) THEN
    SET p_query_string = ' AND emp_dept='||V_EMP_DEPT||' WITH UR';
ELSE
    SET p_query_string = ' WITH UR';
END IF;

DECLARE C1 CURSOR WITH RETURN TO CLIENT FOR SELECT emp_name,emp_no,emp_dept,emp_location from employee where status=1 p_query_string;
OPEN C1;
END@

should be executed successfully

Answer 1

Declarations and statements can't follow in arbitrary order in a Compound SQL (compiled) statement

Cursor declarations must follow the variables declarations and must be followed by the SQL procedure statements.

So, place the cursor declaration after the variable declaration.

Moreover, there is a number of other errors in your code. Should be something like this:

CREATE OR REPLACE PROCEDURE FETCH_EMP_SP(IN V_EMP_NAME VARCHAR(100),IN V_EMP_DEPT VARCHAR(100))
DYNAMIC RESULT SETS 1
LANGUAGE SQL
BEGIN
DECLARE p_query_string  VARCHAR(256);
DECLARE C1 CURSOR WITH RETURN TO CLIENT FOR S1;

IF ((V_EMP_NAME IS NOT NULL) AND (V_EMP_DEPT IS NOT NULL)) THEN
    SET p_query_string = ' AND emp_name ='''||V_EMP_NAME||''' AND emp_dept='''||V_EMP_DEPT||''' WITH UR';
ELSEIF(V_EMP_DEPT IS NOT NULL) THEN
    SET p_query_string = ' AND emp_dept='''||V_EMP_DEPT||''' WITH UR';
ELSE
    SET p_query_string = ' WITH UR';
END IF;

SET p_query_string='SELECT emp_name,emp_no,emp_dept,emp_location from employee where status=1 '||p_query_string;
PREPARE S1 FROM p_query_string;
OPEN C1;
END@

String constants in the query text must be wrapped in single quotes. Don't do this if emp_dept is a numeric column.