Question

我正在尝试使用c＃从oracle数据库获取数据。我使用System.Data.OracleClient.dll，但由于这已经过时，我决定将其更改为System.Data.Oledb。我的联系：

connection = new OleDbConnection();
connection.ConnectionString = string.Format("Provider=OraOLEDB.Oracle;Data Source={0};User ID={1};Password=23};", source, user, password);

以下是获取数据的方法：

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＆＃34;从table1＆＃34;中选择*时它有效，但有了这个声明，我的视觉工作室说＆＃39; OledbException row-00001无法分配内存＆＃39; on＆＃39; OleDbDataReader reader = command.ExecuteReader（）;＆＃39;

Answer 1

我不确定为什么会产生这个特定的错误，但是当你使用Parameters.Add时，它似乎并没有替代多个参数实例。

因为您使用＆＃34;：tel＆＃34;在SQL语句中需要两次使用Parameters.Add。如果你重复使用相同的参数名称似乎工作正常，但无论如何我都重命名。

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, ' ', ''), '-', ''), '(', ''), ')', '') = :tel1 Or REPLACE(REPLACE(REPLACE(REPLACE(t1.gsmnr, ' ', ''), '-', ''), '(', ''), ')', '') = :tel2);";
command.CommandText = sql;
command.Parameters.Add(new OleDbParameter(":tel1", telnr));
command.Parameters.Add(new OleDbParameter(":tel2", telnr));

OledbException row-00001无法分配内存

1 个答案: