使用SQL存储函数给出无效的SQL语句 [英] Using SQL stored function gives invalid SQL statement

问题描述

我正在尝试在c#应用程序中使用Oracle Express数据库中的存储功能.

I'm trying to use stored function from Oracle Express database in c# application.

OdbcCommand com = new OdbcCommand("SILNIA",sqlConn);
com.CommandType = CommandType.StoredProcedure;

OdbcParameter sqlParam = new OdbcParameter("@ReturnValue", OdbcType.Int);
sqlParam.Direction = ParameterDirection.ReturnValue;
com.Parameters.Add(sqlParam);
com.ExecuteNonQuery();

label1.Content = com.Parameters["@ReturnValue"].Value.ToString();

其中定义了SILNIA函数(无错误编译):

where SILNIA function (compiles without errors) is defined:

create or replace
FUNCTION SILNIA RETURN NUMBER IS
w NUMBER := 1;
BEGIN
for i in 1..5 loop
w:=w*i;
end loop;

RETURN w;
END SILNIA;

在线:

com.ExecuteNonQuery();

我明白了

ERROR [42000] [Microsoft][ODBC driver for Oracle][Oracle]ORA-00900: invalid SQL statement.

但这有效，没有任何问题:

But this works works without any problems:

OdbcCommand sqlCom = new OdbcCommand("SELECT SILNIA() FROM DUAL", sqlConn);
label1.Content = sqlCom.ExecuteScalar().ToString();

推荐答案

您不能使用ExecuteNonQuery()运行SP.您还必须做其他事情-ExecuteScalar或ExecuteReader

You can't use ExecuteNonQuery() to run a SP. You have to do something else -- ExecuteScalar or ExecuteReader

这是因为ExecuteNonQuery()仅设计用于UPDATE，INSERT和DELETE语句.

This is because ExecuteNonQuery() is designed to only work with UPDATE, INSERT, and DELETE statements.

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