如何將列名和表名作為參數傳遞給SQL存儲過程

Question

CREATE OR REPLACE FUNCTION getIdFromNameParameter 
    (columnName VARCHAR2, tableName VARCHAR2, whereColumn VARCHAR2, parameterColumn VARCHAR2)
RETURN VARCHAR2
AS
    idCatc VARCHAR2(50);
BEGIN
    execute immediate 'SELECT ' || columnName || ' INTO ' || idCatc || ' FROM ' || tableName || ' WHERE ' || whereColumn || ' = ' ||  parameterColumn;
    RETURN idCatc;
END;
/

我收到此警告：

警告：函數創建時出現編譯錯誤

Answer 1

一方面， into是execute immediate一部分：

CREATE OR REPLACE FUNCTION getIdFromNameParameter (
    in_columnName VARCHAR2,
    in_tableName VARCHAR2,
    in_whereColumn VARCHAR2,
    in_parameterColumn VARCHAR2)
RETURN VARCHAR2
AS
    idCatc VARCHAR2(50);
BEGIN
    execute immediate 'SELECT ' || in_columnName || ' FROM ' || in_tableName || ' WHERE ' || in_whereColumn || ' = ' ||  in_parameterColumn
    INTO idCatc;
    RETURN idCatc;
END;

您還使用+進行字符串連接。

Answer 2

如果創建這樣的函數，請使用以下類似方法確保它免受sql注入的侵害。 這使用dbms_assert清除輸入內容，以防諸如'; drop table xyz;'之類的問題。

 CREATE OR REPLACE FUNCTION getidfromnameparameter (
        in_columnname        VARCHAR2,
        in_tablename         VARCHAR2,
        in_wherecolumn       VARCHAR2,
        in_parametercolumn   VARCHAR2
    ) RETURN VARCHAR2 AS
        idcatc   VARCHAR2(50);
    BEGIN
        EXECUTE IMMEDIATE 'SELECT '
                         || sys.dbms_assert.qualified_sql_name(in_columnName)
                         || ' FROM '
                         || sys.dbms_assert.sql_object_name(in_tableName)
                         || ' WHERE '
                         || sys.dbms_assert.qualified_sql_name(in_whereColumn)
                         || ' = '
                         || sys.dbms_assert.enquote_literal(in_parametercolumn)
       INTO idcatc;

       RETURN idcatc;
  END;
  /