INFORMIX IDS11.5 动态存储过程（DYNAMIC SPL） - INFORM...

INFORMIX IDS11支持 动态存储过程。本文通过举例的方法演示如何在INFORMIX中创建动态存储过程。

EXAMPLE 1 

说明 EXECUTE IMMEDIATE 语句

可以通过参数名来动态执行不同的表

DATABASE stores_demo;
   
CREATE PROCEDURE create_tab (table_name CHAR(128), column_list CHAR(512))

   DEFINE l_crtstmt   CHAR(1024);

   LET l_crtstmt = "CREATE TABLE " || table_name ||"("|| column_list || " )";  --动态语句，存放到一个变量中

   EXECUTE IMMEDIATE l_crtstmt;          --动态执行SQL

END PROCEDURE;

执行存储过程

EXECUTE PROCEDURE create_tab ("tmp_cust","cust_num INTEGER,cust_fname CHAR(30)");

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EXAMPLE 2

说明在SPL中如何利用游标和动态语句

DATABASE stores_demo;

-- Procedure to dynamically constructs query `cust_qry' using supplied
-- table_name and returns all rows whose first name is the supplied
-- first_name

CREATE PROCEDURE customer_details(table_name CHAR(30),first_name CHAR(30))
RETURNING INTEGER, CHAR(30), CHAR(30), CHAR(30);

   DEFINE cust_qry VARCHAR(250);
   DEFINE l_cust_num INTEGER;

   DEFINE l_fname CHAR(30);
   DEFINE l_lname CHAR(30);
   DEFINE l_state CHAR(30);

   -- Construct a Dynamic query using SPL argument table_name

   LET cust_qry = "select customer_num, fname, lname, state from "
||table_name || " where fname = ?";

   -- Prepare the above constructed query
   -- Get the statement handle "statement_id"

   PREPARE stmt_id FROM cust_qry;

-- Declare the cursor for the prepared "statement_id"
-- get the cursor handle "cust_cur"

DECLARE cust_cur cursor FOR stmt_id;

           -- Open the declared cursor using handle "cust_cur"
           -- Supply the first_name as an input. This will be
           -- substituted in the place of "?" in the query

 

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