在Oracle中执行动态SQL查询 [英] Executing Dynamic Sql query in Oracle

问题描述

我有一个SELECT查询，其中有一个动态WHERE条件.问题是当我尝试将WHERE条件PARAMETER与SQL查询连接在一起时，不允许我保存PROCEDURE.

I have a SELECT query in which i will have a a Dynamic WHERE condition. The thing is when I try to concatenate the WHERE condition PARAMETER with the SQL Query its not allowing me to save the PROCEDURE.

例如:

CREATE PROCEDURE usp_MySearchQuery
(
  QTYPE IN INT,
  OUT_CUR OUT SYS_REFCURSOR
)
IS
DYN_QUERY VARCHAR2;
BEGIN
    IF QTYPE=1 THEN
       DYN_QUERY :=' BETWEEN 1 AND 2';
    ELSE
       DYN_QUERY :='=10';    
    END IF;

    OPEN OUT_CUR FOR
         SELECT * FROM MYTABLE WHERE TYPE=QTYPE AND ID || DYN_QUERY;
END;

这是我的程序的样子. 我尝试了EXECUTE IMMEDIETE，但是在其文档本身中，它编写的内容不适用于多行查询.

This is how my procedure looks like. I tried EXECUTE IMMEDIETE but in its documentation itself, its written it wont work for multiple row query.

在MSSQL中，我们有EXEC(不确定)命令，该命令可以execute发送给该命令的文本.同样，我们是否有任何命令可以在Oracle

In MSSQL we have EXEC(not sure) command which can execute the text sent to the command. In the same way do we have any commands which can run the dynamic query in Oracle

UPDATE: Answer

---

我尝试过这样.

---

I tried like this.

  OPEN OUT_CUR FOR
        ' SELECT * FROM MYTABLE WHERE TYPE=:QTYPE AND ID ' || DYN_QUERY
          USING QTYPE;

它奏效了

推荐答案

动态字符串必须包含在单引号"内

The Dynamic String has to be enclosed within 'Single Quotes'

OPEN OUT_CUR FOR
     'SELECT * FROM MYTABLE WHERE ID '|| DYN_QUERY;

EXECUTE IMMEDIATE如果使用BULK COLLECT

，则允许多行结果 示例:

EXECUTE IMMEDIATE allows Multi row result, if you use BULK COLLECT

Example:

DECLARE
  TYPE myarray IS TABLE OF VARCHAR2(100);
  v_array myarray;
BEGIN
  EXECUTE IMMEDIATE 'select ''x'' from dual union all select ''y'' from dual'
    BULK COLLECT INTO v_array;

  --Or you could use the alternative quoting mechanism to avoid doubling quotation marks.
  --EXECUTE IMMEDIATE q'[select 'x' from dual union all select 'y' from dual]'
  --  BULK COLLECT INTO v_array;

  FOR i IN 1..v_array.count
  LOOP
    DBMS_OUTPUT.PUT_LINE(v_array(i));
  END LOOP;
END;

EXECUTE IMMEDIATE使用绑定变量;

String := 'SELECT * FROM EMP WHERE name = :name AND age = :age AND :name <> ''Mahesh''';

EXECUTE IMMEDIATE String USING 'Mahi',21,'Mahi';
<OR>
EXECUTE IMMEDIATE String USING proc_variable1,proc_variable2,proc_variable1;

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