(C#) ASP.NET MySQL Check Already Exists Add/Insert Record |
(C#) ASP.NET MySQL Check Already Exists Add/Insert Record เป็นการตรวจสอบข้อมูลก่อนทำการ Insert ข้อมูล เช่น ตรวจสอบข้อมูลซ้ำ ในตัวอย่างผมได้ทำการตรวจสอบจาก CustomerID ว่าซ้ำหรือไม่ ถ้าซ้ำไม่ต้องทำการ Insert และแจ้งให้ผู้ใช้ได้ทราบ
Instance NameSpace
C#Using System.Data;
Using MySql.Data.MySqlClient;
ASP.NET & MySql.Data.MySqlClient
Language Code : VB.NET ||  C#
AspNetMySQLExistAdd.aspx
<%@ Page Language="C#" Debug="true" %>
<%@ import Namespace="System.Data" %>
<%@ import Namespace="MySql.Data.MySqlClient" %>
<script runat="server">
MySqlConnection objConn = new MySqlConnection();
MySqlCommand objCmd = new MySqlCommand();
String strConnString,strSQL;
void Page_Load(object sender,EventArgs e)
{
strConnString = "Server=localhost;User Id=root; Password=root; Database=mydatabase; Pooling=false";
objConn.ConnectionString = strConnString;
objConn.Open();
}
void btnSave_Click(Object sender , EventArgs e)
{
int intNumRows;
strSQL = "SELECT COUNT(*) FROM customer WHERE CustomerID = '"+ this.txtCustomerID.Text +"' ";
objCmd = new MySqlCommand(strSQL, objConn);
intNumRows = Convert.ToInt32(objCmd.ExecuteScalar());
if(intNumRows > 0)
{
this.pnlAdd.Visible = false;
this.lblStatus.Visible = true;
this.lblStatus.Text = "CustomerID already exists.";
}
else
{
strSQL = "INSERT INTO customer (CustomerID,Name,Email,CountryCode,Budget,Used) " +
" VALUES " +
" ('" + this.txtCustomerID.Text + "','" + this.txtName.Text + "','" + this.txtEmail.Text + "', " +
" '" + this.txtCountryCode.Text + "','" + this.txtBudget.Text + "','" + this.txtUsed.Text + "')";
objCmd = new MySqlCommand();
objCmd.Connection = objConn;
objCmd.CommandText = strSQL;
objCmd.CommandType = CommandType.Text;
this.pnlAdd.Visible = false;
try
{
objCmd.ExecuteNonQuery();
this.lblStatus.Text = "Record Inserted";
this.lblStatus.Visible = true;
}
catch (Exception ex)
{
this.lblStatus.Visible = true;
this.lblStatus.Text = "Record can not insert Error ("+ ex.Message +")";
}
}
}
void Page_UnLoad()
{
objConn.Close();
objConn = null;
}
</script>
<html>
<head>
<title>ThaiCreate.Com ASP.NET - MySql</title>
</head>
<body>
<form id="form1" runat="server">
<asp:Panel id="pnlAdd" runat="server">
<table width="353" border="1">
<tbody>
<tr>
<td width="102">
<asp:Label id="lblCustomerID" runat="server" text="CustomerID"></asp:Label></td>
<td width="235">
<asp:TextBox id="txtCustomerID" runat="server" Width="79px"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label id="lblName" runat="server" text="Name"></asp:Label></td>
<td>
<asp:TextBox id="txtName" runat="server" Width="177px"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label id="lblEmail" runat="server" text="Email"></asp:Label></td>
<td>
<asp:TextBox id="txtEmail" runat="server" Width="155px"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label id="lblCountryCode" runat="server" text="CountryCode"></asp:Label></td>
<td>
<asp:TextBox id="txtCountryCode" runat="server" Width="38px"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label id="lblBudget" runat="server" text="Budget"></asp:Label></td>
<td>
<asp:TextBox id="txtBudget" runat="server" Width="76px"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label id="lblUsed" runat="server" text="Used"></asp:Label></td>
<td>
<asp:TextBox id="txtUsed" runat="server" Width="76px"></asp:TextBox>
</td>
</tr>
</tbody>
</table>
<br />
<asp:Button id="btnSave" onclick="btnSave_Click" runat="server" Text="Save"></asp:Button>
<br />
</asp:Panel>
<asp:Label id="lblStatus" runat="server" visible="False"></asp:Label>
</form>
</body>
</html>
Screenshot
ASP.NET MySql.Data.MySqlClient - Parameter Query
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 ช่วยกันสนับสนุนรักษาเว็บไซต์ความรู้แห่งนี้ไว้ด้วยการสนับสนุน Source Code 2.0 ของทีมงานไทยครีเอท
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By : |
ThaiCreate.Com Team (บทความเป็นลิขสิทธิ์ของเว็บไทยครีเอทห้ามนำเผยแพร่ ณ เว็บไซต์อื่น ๆ) |
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Score Rating : |
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Create/Update Date : |
2008-10-26 22:58:18 /
2017-03-29 10:09:21 |
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