我收到错误
ORA-00904:“GLOBAL_VARIABLE_ARR”:无效标识符ORA-06512:第51行。
它与global_variable_rec.where_clause
有关。
有人可以帮我解决这个问题吗?代码如下。我们假设从distribution_id
返回global_variable_arr('GLOBAL_DISTRIBUTION_ID')
值。但事实并非如此。
CREATE OR REPLACE Procedure updateGlobalvariables ( transmittal_id IN NUMBER, distribution_id IN NUMBER )
IS
sql_data VARCHAR2(500); --Holds select statment resulting value
query_string VARCHAR2(500); --Holds query/sql
i VARCHAR2(75); --Used for looping through the array
--transmittal_id NUMBER(3) := 321;
--distribution_id NUMBER(3) := 123;
--place holder for LETTER_GLOBAL_VARIABLE.TABLE_NAME
table_name VARCHAR2(30);
--Array for the Global Variables
TYPE global_variable_table_arr IS TABLE OF VARCHAR2(500) INDEX BY VARCHAR2(30);
global_variable_arr global_variable_table_arr;
--Cursor to hold the global variables
CURSOR global_variable_cur IS
SELECT * FROM LETTER_GLOBAL_VARIABLES
WHERE TABLE_NAME IS NOT NULL AND WHERE_CLAUSE IS NOT NULL;
--Record for the cursor to hold the data from the cursor.
global_variable_rec global_variable_cur%rowtype;
BEGIN
--Filling the array with(Element) the value from Distribution ID
global_variable_arr('GLOBAL_DISTRIBUTION_ID') := distribution_id;
dbms_output.put_line('GLOBAL_DISTRIBUTION_ID := '|| global_variable_arr('GLOBAL_DISTRIBUTION_ID') );
--Filling the array with(Element) the value from Transmittal ID
global_variable_arr('GLOBAL_TRANSMITTAL_ID') := transmittal_id;
dbms_output.put_line('GLOBAL_TRANSMITTAL_ID := '|| global_variable_arr('GLOBAL_TRANSMITTAL_ID') );
OPEN global_variable_cur;
FETCH global_variable_cur INTO global_variable_rec;
LOOP
FETCH global_variable_cur INTO global_variable_rec;
EXIT WHEN global_variable_cur%NOTFOUND;
--Display table name, column name,global variable and the where clause (All from the LETTER_GLOBAL_VARIABLE table)
dbms_output.put_line('Table name is: '|| global_variable_rec.table_name ||', column name is: '|| global_variable_rec.column_name ||', global variable name is: '|| global_variable_rec.global_variable || ', where clause is: ' || global_variable_rec.where_clause);
--This the query that will grab the value(s) from the table(s). It is stored inside a variable
query_string:= 'SELECT '||global_variable_rec.column_name|| ' FROM '|| global_variable_rec.table_name ||' WHERE '|| global_variable_rec.where_clause;
/* the where_clause contains: DISTRIBUTION_ID=global_variable_arr('GLOBAL_DISTRIBUTION_ID') */
--Displays the SQL Query (query_string)
dbms_output.put_line('SQL QUERY IS: ' || query_string);
--This Executes the Query(SQL statement) inside the query_string variable
--and saves the result(Value) into the sql_data variable.
EXECUTE IMMEDIATE query_string INTO sql_data;
--Display the value inside the variable sql_data
dbms_output.put_line('SQL data IS: ' || sql_data);
--Fill in the array with the value(Elements) from the sql_data variable.
global_variable_arr(global_variable_rec.global_variable) := sql_data;
END LOOP;
CLOSE global_variable_cur;
i := global_variable_arr.FIRST; -- Get first element of array
WHILE i IS NOT NULL LOOP
--Displaying the global variable and its value
dbms_output.put_line('Global Varaible name : ' || i || ' Value : ' || global_variable_arr(i));
i := global_variable_arr.NEXT(i); -- Get next element of array
END LOOP;
END;
--EXECUTE updateGlobalvariables;
这是我的出局:
GLOBAL_DISTRIBUTION_ID:= 123 GLOBAL_TRANSMITTAL_ID:= 321 表名是:DISTRIBUTION,列名是:PERSON_ID,全局变量名是:Global_person_id,where子句是:DISTRIBUTION_ID = global_variable_arr('GLOBAL_DISTRIBUTION_ID') SQL QUERY IS:从分配中选择PERSON_ID,其中DISTRIBUTION_ID = global_variable_arr('GLOBAL_DISTRIBUTION_ID')
答案 0 :(得分:1)
如果您没有明确地将此变量提供给SQL引擎,则动态SQL无法查看变量的内容。
将动态SQL视为与您的过程完全隔离的独立引擎。就好像您在程序中打开了一个SQL * Plus终端并输入了查询。
显然以下会在终端中失败:
SELECT PERSON_ID
FROM DISTRIBUTION
WHERE DISTRIBUTION_ID=global_variable_arr('GLOBAL_DISTRIBUTION_ID')
为什么会失败?因为数据库中没有名为global_variable_arr
的对象,因此无效标识符错误。
使用动态SQL时,您必须非常具体,并手动将变量提供给引擎。你必须自己这样做,就好像你使用的是java或C#,或者实际上是非静态PL / SQL的任何其他语言(这就是为什么你应该首先坚持使用静态SQL,并尽可能长时间)。
您的查询应该是:
SELECT PERSON_ID FROM DISTRIBUTION WHERE DISTRIBUTION_ID = :VARIABLE_A
你会call it with:
EXECUTE IMMEDIATE query_string
INTO sql_data
USING global_variable_arr('GLOBAL_DISTRIBUTION_ID');