C# 在MySql中使用where子句选择
是否可以从具有特定ID的表中选择数据?我知道它适用于更新,但select的代码是什么 我在visual Studio中使用c,我的目标是在只读文本框中显示详细信息 这应该可以C# 在MySql中使用where子句选择,c#,mysql,select,visual-studio-2013,where,C#,Mysql,Select,Visual Studio 2013,Where,是否可以从具有特定ID的表中选择数据?我知道它适用于更新,但select的代码是什么 我在visual Studio中使用c,我的目标是在只读文本框中显示详细信息 这应该可以 string Command = @"select corporateName, corporateAddress, corporateContact from corporatemembership where corporateI
string Command =
@"select corporateName,
corporateAddress,
corporateContact
from corporatemembership
where corporateID = @CorpID;";
using (MySqlConnection myConnection = new MySqlConnection(ConnectionString))
{
using (MySqlDataAdapter myDataAdapter = new MySqlDataAdapter(Command, myConnection))
{
myDataAdapter.SelectCommand.Parameters.Add(new MySqlParameter("@CorpID", CorpID.Text));
DataTable dtResult = new DataTable();
myDataAdapter.Fill(dtResult);
corporateName.Text = dtResult.Rows[0]["corporateName"];
corporateAddress.Text = dtResult.Rows[0]["corporateAddress"];
corporateContact.Text = dtResult.Rows[0]["corporateContact"];
}
}
可能您应该添加一些错误处理,并处理CorpID不存在的情况
更新另一种方法
string Command =
@"select corporateName,
corporateAddress,
corporateContact
from corporatemembership
where corporateID = @CorpID;";
using (MySqlConnection mConnection = new MySqlConnection(ConnectionString))
{
mConnection.Open();
using (MySqlCommand cmd = new MySqlCommand(Command, mConnection))
{
cmd.Parameters.Add(new MySqlParameter("@CorpID", CorpID.Text));
using (MySqlDataReader reader = cmd.ExecuteReader())
{
if (reader.Read())
{
corporateName.Text = (string)reader["corporateName"];
corporateAddress.Text = (string)reader["corporateAddress"];
corporateContact.Text = (string)reader["corporateContact"];
}
}
}
}
是的,有可能,
您的sql字符串是正常的,除了最后一部分,您将编辑最后一部分
string corp=从corporatemembership中选择corporateName、corporateAddress、corporateContact,其中corporateID=+'+CorpID.Text+' 请试一试。
string Command =
@"select corporateName,
corporateAddress,
corporateContact
from corporatemembership
where corporateID = @CorpID;";
using (MySqlConnection mConnection = new MySqlConnection(ConnectionString))
{
mConnection.Open();
using (MySqlCommand cmd = new MySqlCommand(Command, mConnection))
{
cmd.Parameters.Add(new MySqlParameter("@CorpID", CorpID.Text));
using (MySqlDataReader reader = cmd.ExecuteReader())
{
if (reader.Read())
{
corporateName.Text = (string)reader["corporateName"];
corporateAddress.Text = (string)reader["corporateAddress"];
corporateContact.Text = (string)reader["corporateContact"];
}
}
}
}