Question

我有以下pl / sql块我收到PL / SQL错误：数字或值错误：字符到数字转换错误但我没有发现任何这样的转换问题请帮忙

Oracle Pl / Sql Block

declare
Menu_Item_ID  integer :=80;
SelectedColumns  varchar2(800):='';


    IsBlank Number(2);
    V_Column_Name varchar2(150);
    V_Column_Name_Value Varchar2(200);
    V_Url_Column_Name varchar2(100);
SelectedColumnsTemp varchar(8000):=SelectedColumns;
cursor c1 is
Select  Column_Name,Column_Name_Value,Url_Column_Name
    From    COM_MST_REPORT_DEFAULT_COLUMN
    Where   Link_ID = Menu_Item_ID;
Begin

    if SelectedColumnsTemp = ''
  then
            IsBlank := 1;
    Else
            IsBlank := 0;
    End if;
FOR DefaultColumns in c1
LOOP
            V_Column_Name := '';
            V_Column_Name_Value := '';
            V_Url_Column_Name := '';    
    V_Column_Name := '"' + TO_CHAR(DefaultColumns.Column_Name) + '"';
    V_Column_Name_Value := TO_CHAR(DefaultColumns.Column_Name_Value);
    V_Url_Column_Name := TO_CHAR(DefaultColumns.Url_Column_Name);
            if(nvl(V_Url_Column_Name,'') <> '')
                then
                    V_Column_Name_Value  := V_Url_Column_Name  + ' as ' + V_Column_Name; 
            Else
                    V_Column_Name_Value :=  V_Column_Name_Value  + ' as ' + V_Column_Name; 
                End if;
            if IsBlank = 0
                then
                    SelectedColumnsTemp := replace(SelectedColumnsTemp,V_Column_Name,V_Column_Name_Value);
            Else
                            SelectedColumnsTemp := SelectedColumnsTemp + V_Column_Name_Value +  ',';
                End if;

END LOOP;
    DBMS_OUTPUT.PUT_LINE(SelectedColumnsTemp);
End;

Answer 1

在Oracle中，字符串由||连接（或CONCAT()鲜为人知）而不是+

e.g。

V_Column_Name := '"' || TO_CHAR(DefaultColumns.Column_Name) || '"';

而不是

V_Column_Name := '"' + TO_CHAR(DefaultColumns.Column_Name) + '"';

Oracle PL / SQL：数字或值错误：字符到数字转换错误

1 个答案: