[英]How to check if record exists or not and insert in ms access database in c#
I want to check if record exists or not if it exists i dont want to insert if it bot i want to insert the data in ms access database in c#. 我想检查记录是否存在,如果它存在,我不想插入它我想在C#中的ms Access数据库中插入数据。
OleDbCommand cmd = new OleDbCommand("insert into MyTable values('" + test + "','" + test + "','" + "123" + "');", con);
OleDbCommand cmd1 = new OleDbCommand("select * from MyTable", con);
temp = 0;
try
{
con.Open();
string count = (string)cmd1.ExecuteScalar();
temp = cmd.ExecuteNonQuery();
if (temp > 0)
{
MessageBox.Show("One Record Added");
}
else
{
MessageBox.Show("Record not added");
}
}
catch
{ }
Can Anyone suggest me some code. 任何人都可以建议我一些代码。
Thanks In Advance. 提前致谢。
Filter your Select query on the basis of some key . 根据某些关键字过滤您的Select查询。 Check if it returns for existence or non-existence of the particular record and do the processing required .
检查它是否返回特定记录的存在或不存在,并进行所需的处理。
string cmdStr = "Select count(*) from MyTable where id = 1"; //get the existence of the record as count
OleDbCommand cmd = new OleDbCommand(cmdStr, conn);
int count = (int)cmd.ExecuteScalar();
if(count >0)
{
//record already exist
}
Modify this line 修改这行
OleDbCommand cmd1 = new OleDbCommand("select * from MyTable", con);
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