【发布时间】:2015-09-01 12:36:32
【问题描述】:
我正在尝试使用 c# 从 oracle 数据库中获取数据。我使用的是 System.Data.OracleClient.dll,但由于它已过时,我决定将其更改为 System.Data.Oledb。 我的连接:
connection = new OleDbConnection();
connection.ConnectionString = string.Format("Provider=OraOLEDB.Oracle;Data Source={0};User ID={1};Password=23};", source, user, password);
这是我获取数据的方法:
public ContactInfo GetInfo(string telnr)
{
connection.Open();
Console.WriteLine("OracleState: {0}", connection.State);
OleDbCommand command = connection.CreateCommand();
string sql = @"Select t1.bed_bedrijfsnr
, t1.pers_persoonsnr
, REPLACE(REPLACE(REPLACE(REPLACE(t1.telefoonnr, ' ', ''), '-', ''), '(', ''), ')', '') as telnr
, REPLACE(REPLACE(REPLACE(REPLACE(t1.gsmnr, ' ', ''), '-', ''), '(', ''), ')', '') as gsmnr
, t1.e_mail
, t2.synoniem
, t2.sales_coordinator
From table1 t1
, table2 t2
Where t1.bed_bedrijfsnr = t2.bedrijfsnr
And (REPLACE(REPLACE(REPLACE(REPLACE(t1.telefoonnr, ' ', ''), '-', ''), '(', ''), ')', '') = :tel Or REPLACE(REPLACE(REPLACE(REPLACE(t1.gsmnr, ' ', ''), '-', ''), '(', ''), ')', '') = :tel);";
command.CommandText = sql;
command.Parameters.Add(new OleDbParameter(":tel", telnr));
ContactInfo c = null;
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
//readdata
}
reader.Close();
connection.Close();
Console.WriteLine("Oracle State: {0}", connection.State);
return c;
}
当我将 sql 语句更改为“从 table1 中选择 *”时,它可以工作,但使用此语句时,Visual Studio 会在“OleDbDataReader reader = command.ExecuteReader();”上显示“OledbException row-00001 无法分配内存”
【问题讨论】: