我有接受多个参数(即PNAME,pHeight,pTeam)存储过程
我已经建立了这样的查询:
SQLQuery VARCHAR2(6000);
TestCursor T_CURSOR;
SQLQuery := 'SELECT ID, Name, Height, Team FROM MyTable WHERE ID IS NOT NULL ';
-- Build the query based on the parameters passed.
IF pName IS NOT NULL
SQLQuery := SQLQuery || 'AND Name LIKE :pName ';
END IF;
IF pHeight IS > 0
SQLQuery := SQLQuery || 'AND Height = :pHeight ';
END IF;
IF pTeam IS NOT NULL
SQLQuery := SQLQuery || 'AND Team LIKE :pTeam ';
END IF;
OPEN TestCursor FOR SQLQuery USING pName, pHeight, pTeam;
如果我执行传递的所有参数的程序,它运行正常。
但是,如果我只是通过一个或两个参数,那么程序出现了错误:
ORA-01006: bind variable does not exist
如何选择基于其中参数值的参数变量结合使用? 例如,如果只PNAME获得通过,那么我只会执行查询:
OPEN TestCursor FOR SQLQuery USING pName;
或者,如果PNAME和pTeam都获得通过,则:
OPEN TestCursor FOR SQLQuery USING pName, pTeam;
希望有人能摆脱更多的途径来解决这个问题。 谢谢。
编辑:我其实可以使用以下命令:
- 构建基于传递的参数查询。 如果PNAME IS NOT NULL的SQLQuery:= ||的SQLQuery “名称LIKE‘’” || PNAME || ''”“; 万一;
IF pHeight IS > 0
SQLQuery := SQLQuery || 'AND Height = pHeight ';
END IF;
IF pTeam IS NOT NULL
SQLQuery := SQLQuery || 'AND Team LIKE ''' || pTeam || ''' ';
END IF;
OPEN TestCursor FOR SQLQuery;
但是,这将是非常容易受到SQL注入...
Answer 1:
这不是巨大的优雅,但它意味着你总是可以提供全部三种绑定变量,即使他们中的一些是空的。 您只需增加额外的WHERE
如果需要的条款。
(我试图格式化动态SQL,使其更具可读性,你可以只提供其作为一个长字符串)。
FUNCTION myFunc (
pName IN VARCHAR2,
pHeight IN VARCHAR2,
pTeam IN VARCHAR2
)
RETURN T_CURSOR
IS
-- Local Variables
SQLQuery VARCHAR2(6000);
TestCursor T_CURSOR;
BEGIN
-- Build SQL query
SQLQuery := 'WITH t_binds '||
' AS (SELECT :v_name AS bv_name, '||
' :v_height AS bv_height, '||
' :v_team AS bv_team '||
' FROM dual) '||
' SELECT id, '||
' name, '||
' height, '||
' team '||
' FROM MyTable, '||
' t_binds '||
' WHERE id IS NOT NULL';
-- Build the query WHERE clause based on the parameters passed.
IF pName IS NOT NULL
THEN
SQLQuery := SQLQuery || ' AND Name LIKE bv_name ';
END IF;
IF pHeight > 0
THEN
SQLQuery := SQLQuery || ' AND Height = bv_height ';
END IF;
IF pTeam IS NOT NULL
THEN
SQLQuery := SQLQuery || ' AND Team LIKE bv_team ';
END IF;
OPEN TestCursor
FOR SQLQuery
USING pName,
pHeight,
pTeam;
-- Return the cursor
RETURN TestCursor;
END myFunc;
我不是在DB访问工作站的前面,所以我无法测试的功能,但它应该是接近(请原谅任何语法错误,这是一个漫长的一天!)
希望能帮助到你...
Answer 2:
您可以使用DBMS_SQL包。 这提供了另一种方式来运行动态SQL。 这也许是更麻烦一点用,但它可以更加灵活,尤其是具有不同的绑定参数的数字。
这里是你如何使用它(警告:我没有测试过这一点):
FUNCTION player_search (
pName IN VARCHAR2,
pHeight IN NUMBER,
pTeam IN VARCHAR2
) RETURN SYS_REFCURSOR
IS
cursor_name INTEGER;
ignore INTEGER;
id_var MyTable.ID%TYPE;
name_var MyTable.Name%TYPE;
height_var MyTable.Height%TYPE;
team_var MyTable.Team%TYPE;
BEGIN
-- Put together SQLQuery here...
-- Open the cursor and parse the query
cursor_name := DBMS_SQL.OPEN_CURSOR;
DBMS_SQL.PARSE(cursor_name, SQLQuery, DBMS_SQL.NATIVE);
-- Define the columns that the query returns.
-- (The last number for columns 2 and 4 is the size of the
-- VARCHAR2 columns. Feel free to change them.)
DBMS_SQL.DEFINE_COLUMN(cursor_name, 1, id_var);
DBMS_SQL.DEFINE_COLUMN(cursor_name, 2, name_var, 30);
DBMS_SQL.DEFINE_COLUMN(cursor_name, 3, height_var);
DBMS_SQL.DEFINE_COLUMN(cursor_name, 4, team_var, 30);
-- Add bind variables depending on whether they were added to
-- the query.
IF pName IS NOT NULL THEN
DBMS_SQL.BIND_VARIABLE(cursor_name, ':pName', pName);
END IF;
IF pHeight > 0 THEN
DBMS_SQL.BIND_VARIABLE(cursor_name, ':pHeight', pHeight);
END IF;
IF pTeam IS NOT NULL THEN
DBMS_SQL.BIND_VARIABLE(cursor_name, ':pTeam', pTeam);
END IF;
-- Run the query.
-- (The return value of DBMS_SQL.EXECUTE for SELECT queries is undefined,
-- so we must ignore it.)
ignore := DBMS_SQL.EXECUTE(cursor_name);
-- Convert the DBMS_SQL cursor into a PL/SQL REF CURSOR.
RETURN DBMS_SQL.TO_REFCURSOR(cursor_name);
EXCEPTION
WHEN OTHERS THEN
-- Ensure that the cursor is closed.
IF DBMS_SQL.IS_OPEN(cursor_name) THEN
DBMS_SQL.CLOSE_CURSOR(cursor_name);
END IF;
RAISE;
END;
(注: DBMS_SQL.TO_REFCURSOR
在Oracle 11g中是新的。)
Answer 3:
我使用的方法是在动态SQL包括ELSE情况下,美国的IF相反。 你的代码测试PNAME不为空,所以我就一个条款添加到PNAME为NULL生成的查询测试。 这样,每次都可以通过相同的参数,而不会影响查询的结果。
SQLQuery VARCHAR2(6000);
TestCursor T_CURSOR;
SQLQuery := 'SELECT ID, Name, Height, Team FROM MyTable WHERE ID IS NOT NULL ';
-- Build the query based on the parameters passed.
IF pName IS NOT NULL
SQLQuery := SQLQuery || 'AND Name LIKE :pName ';
ELSE
SQLQuery := SQLQuery || 'AND :pName IS NULL';
END IF;
IF pHeight IS > 0
SQLQuery := SQLQuery || 'AND Height = :pHeight ';
ELSE
SQLQuery := SQLQuery || 'AND :pHeight <=0 ';
END IF;
IF pTeam IS NOT NULL
SQLQuery := SQLQuery || 'AND Team LIKE :pTeam ';
ELSE
SQLQuery := SQLQuery || 'AND :pTeam IS NULL';
END IF;
OPEN TestCursor FOR SQLQuery USING pName, pHeight, pTeam;
Answer 4:
怎么样
SQLQuery := 'SELECT ID, Name, Height, Team FROM MyTable WHERE ID IS NOT NULL ';
SQLQuery := SQLQuery || 'AND Name LIKE :pName ';
SQLQuery := SQLQuery || 'AND Team LIKE :pTeam ';
SQLQuery := SQLQuery || 'AND (Height = :pHeight OR :pHeight = 0)';
OPEN TestCursor FOR SQLQuery USING nvl(pName, '%'), nvl(pTeam, '%'), nvl(pHeight, 0), nvl(pHeight, 0);
?
文章来源: Binding Parameters to Oracle Dynamic SQL