c# OleDb Oracle函数和表类型
本文关键字:类型 函数 OleDb Oracle | 更新日期: 2023-09-27 18:08:41
我试图调用一个Oracle函数,返回一个类型封装在一个表
类型对象
create or replace
type Z_TBL_STRUCTURE_CODE
AS OBJECT
(
PROJ_ID varchar2(50 BYTE)
);
类型表
create or replace
type Z_TABLE_STRUCTURE_CODE AS TABLE of Z_TBL_STRUCTURE_CODE;
甲骨文函数
create or replace
FUNCTION Z_TESTE_IN_FUNC
(
var_teste in varchar2
)
return Z_TABLE_STRUCTURE_CODE
AS
tab Z_TABLE_STRUCTURE_CODE;
BEGIN
EXECUTE IMMEDIATE
'SELECT
CAST(
MULTISET(
select count(*) into num from structure
where structure_code in ('|| var_teste ||')) as Z_TABLE_STRUCTURE_CODE)
into tab
from dual;';
dbms_output.put_line(var_teste);
return tab;
END Z_TESTE_IN_FUNC;
注意:请忽略EXECUTE IMMEDIATE,它只是一个测试。
注2:我知道有一个选项可以避免类型(使用游标),但我还没有能够理解这个主题,所以我希望你在回答时忽略光标,除非它是唯一可用的选项。
c#代码public DataTable getTaskStartFinish()
{
OleDbConnection con = null;
OleDbDataReader reader = null;
try{
con = new OleDbConnection(ConfigurationManager.ConnectionStrings["OracleBD"].ConnectionString);
OleDbCommand cmd = new OleDbCommand("", con);
cmd.CommandText = "Z_TESTE_IN_FUNC";
cmd.CommandType = CommandType.StoredProcedure;
OleDbParameter retval = new OleDbParameter("retval", OleDbType.VarChar, 10);
retval.Direction = ParameterDirection.ReturnValue;
OleDbParameter inval = new OleDbParameter("inval", OleDbType.Variant, 50);
inval.Direction = ParameterDirection.Input;
inval.Value = "1";
cmd.Parameters.Add(retval);
cmd.Parameters.Add(inval);
con.Open();
reader = cmd.ExecuteReader();
DataTable dt = new DataTable();
dt.Load(reader);
return dt;
}
catch(Exception ex)
{
throw new Exception("getTaskStartFinish error: " + ex.Message);
}
finally
{
if(con != null)
con.Close();
if(reader != null || !reader.IsClosed)
reader.Close();
}
}
我得到的当前错误如下:ORA-06550:第1行,第13列PLS-00382:表达式类型错误ORA-06550:第1行,第7列PL/SQL: Statement ignored
我在网上看到过类似的例子,但都使用ExecuteScalar()或一些过程或函数的代码返回奇异值,但不返回表。
如果您想返回单个值,我的建议是(为多行编辑):
OleDbConnection conn = new OleDbConnection(ConfigurationManager.ConnectionStrings["OracleBD"].ConnectionString);
OleDbCommand cmd = new OleDbCommand("Z_TESTE_IN_FUNC", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@procValueName", "myValue");
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
DataTable dt = new DataTable();
conn.Open();
try
{
da.Fill(dt);
}
catch (Exception excp)
{
//Handle Exception
}
finally
{
conn.Close();
}
编辑2:Try this for function
OleDbConnection con = new OleDbConnection(cntStr);
con.Open();
OleDbCommand cmd = new OleDbCommand("F_TESTFUNC", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new OleDbParameter("retVal", OleDbType.VarChar, 11,ParameterDirection.ReturnValue, true, 0, 0, "retVal", DataRowVersion.Current,null);
cmd.Parameters.Add("ID", strID);
cmd.ExecuteScalar();
con.Close();