使用这个方法
PROCEDURE "ADD_BOOKMARK_GROUP" (
"NAME" IN VARCHAR2,
"BOOKMARK_GROUP_ID" IN NUMBER,
"STAFF_ID" IN VARCHAR2,
"MAX_NO" IN INT,
"NUMFOUND" OUT INT,
"NEW_ID" OUT NUMBER) IS
BEGIN
NEW_ID := -1;
SELECT COUNT(*) INTO NUMFOUND FROM BOOKMARK_GROUP_TABLE WHERE STAFF_ID = STAFF_ID;
IF NUMFOUND < MAX_NO THEN
INSERT INTO BOOKMARK_GROUP_TABLE (NAME, BOOKMARK_GROUP_ID, STAFF_ID) VALUES(NAME, BOOKMARK_GROUP_ID, STAFF_ID);
SELECT BGT_SEQUENCE.currval INTO NEW_ID FROM dual;
END IF;
END;
我觉得很有趣,如果我不按照定义的顺序添加参数,例如:
OracleCommand cmd = new OracleCommand("ADD_BOOKMARK_GROUP", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new OracleParameter("NAME", name));
...
cmd.Parameters.Add(new OracleParameter("NEW_ID", OracleDbType.Decimal)).Direction = ParameterDirection.Output;
cmd.Parameters.Add(new OracleParameter("NUMFOUND", OracleDbType.Int32)).Direction = ParameterDirection.Output;
而不是
OracleCommand cmd = new OracleCommand("ADD_BOOKMARK_GROUP", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new OracleParameter("NAME", name));
...
cmd.Parameters.Add(new OracleParameter("NUMFOUND", OracleDbType.Int32)).Direction = ParameterDirection.Output;
cmd.Parameters.Add(new OracleParameter("NEW_ID", OracleDbType.Decimal)).Direction = ParameterDirection.Output;
返回的值由
cmd.Parameters["NEW_ID"].Value.ToString()
并且
cmd.Parameters["NUMFOUND"].Value.ToString()
虽然通过VS2008 Server Explorer运行该程序可以返回正确的数据,但是交换发生了。
为什么会这样?