我试图调用返回引用游标的Oracle存储过程,我需要从返回的数据生成树视图。我是新手,我有两个问题。
第一个问题是我无法调用该程序。我收到此错误:“调用'OBJECT_HIERARCHY'时参数的数量或类型错误”
我的第二个问题是,我不明白当这个过程返回一个引用游标值时,我将如何获取该数据?该表中有超过5000条记录,我没有获得该数据,而是一个引用游标值。有人可以解释我如何使用ref游标值获取该数据。我没有使用Oracle的经验。
这是oracle中的过程定义:
CREATE OR REPLACE PROCEDURE SAD.object_hierarchy
(nAppId IN NUMBER,
nParentId IN NUMBER DEFAULT -1,
o_cRefCursor OUT SYS_REFCURSOR)
IS
BEGIN
IF NOT o_cRefCursor%ISOPEN THEN
OPEN o_cRefCursor FOR
SELECT
h.PARENT_ID, h.CHILD_ID, h.H_LEVEL,
o.OBJECT_IDENTIFIER, o.OBJECT_TYPE_ID
FROM
(
SELECT
PARENT_ID, CHILD_ID, LEVEL AS H_LEVEL
FROM OBJECT_RELATIONSHIPS
START WITH PARENT_ID = nParentId --> -1 --= 60170
CONNECT BY PRIOR CHILD_ID = PARENT_ID
) h
INNER JOIN
OBJECTS o
ON
o.OBJECT_ID = h.CHILD_ID AND
O.APPLICATION_ID = nAppId;
END IF;
END object_hierarchy;
这些是表字段定义
Column Name Data Type
OBJECT_REL_ID NUMBER (14)
PARENT_ID NUMBER (14)
CHILD_ID NUMBER (14)
OBJECT_IDENTIFIER VARCHAR2 (255 Byte)
OBJECT_TYPE_ID VARCHAR2 (5 Byte)
这是我的代码,它返回错误:
string oradb = "Data Source=(DESCRIPTION="
+ "(ADDRESS=(PROTOCOL=TCP)(HOST=tnt33)(PORT=1521))"
+ "(CONNECT_DATA=(SERVICE_NAME=ORCL)));"
+ "User Id=xxx;Password=xxxxx;";
OracleConnection con = new OracleConnection(oradb);
try
{
con.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection = con;
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.CommandText = "SAD.object_hierarchy";
cmd.Parameters.Add("nAppId", OracleDbType.Int16).Value = 1;
OracleParameter oraP = new OracleParameter();
oraP.OracleDbType = OracleDbType.RefCursor;
oraP.Direction = System.Data.ParameterDirection.Output;
cmd.Parameters.Add(oraP);
OracleDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
}
reader.Close();
}
catch (Exception ex)
{
con.Close();
}
有人可以帮助我并向我解释为什么我的代码会返回此错误:“调用'OBJECT_HIERARCHY'时参数的数量或类型错误”
答案 0 :(得分:10)
示例:
string connStr = "Data Source=datasource;Persist Security Info=True;User ID=user;Password=pass;Unicode=True";
DataSet dataset = new DataSet();
string connStr = ConfigurationManager.ConnectionStrings["OracleConn"].ToString();
using (OracleConnection objConn = new OracleConnection(connStr))
{
OracleCommand objCmd = new OracleCommand();
objCmd.Connection = objConn;
objCmd.CommandText = "Oracle_PkrName.Stored_Proc_Name";
objCmd.CommandType = CommandType.StoredProcedure;
objCmd.Parameters.Add("Emp_id", OracleType.Int32).Value = 3; // Input id
objCmd.Parameters.Add("Emp_out", OracleType.Cursor).Direction = ParameterDirection.Output;
try
{
objConn.Open();
objCmd.ExecuteNonQuery();
OracleDataAdapter da = new OracleDataAdapter(objCmd);
da.Fill(dataset);
}
catch (Exception ex)
{
System.Console.WriteLine("Exception: {0}", ex.ToString());
}
objConn.Close();
}
答案 1 :(得分:4)
如果您要提供OUT
,则还需要提供nParentId
,因为.NET在将语句发送到服务器时不会命名这些参数。
cmd.Parameters.Add("nParentId", OracleDbType.Int16).Value = -1;