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saviour-backup-system/Snippets/Database Connection.cs

75 lines
2.3 KiB
C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlServerCe;
using System.IO;
namespace Local_Database_Connection
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
SqlCeConnection conn = null;
try
{
if (File.Exists("Test.sdf")) { File.Delete("Test.sdf"); }
SqlCeEngine engine = new SqlCeEngine("Data Source = Test.sdf");
engine.CreateDatabase();
conn = new SqlCeConnection("Data Source = Test.sdf");
conn.Open();
SqlCeCommand cmd = conn.CreateCommand();
cmd.CommandText = "CREATE TABLE TestTbl (col1 INT PRIMARY KEY, col2 NTEXT, col3 MONEY)";
cmd.ExecuteNonQuery();
cmd.CommandText = "INSERT INTO TestTbl (col1, col2, col3) VALUES (0, 'abc', 15.66)";
cmd.ExecuteNonQuery();
cmd.CommandText = "INSERT INTO TestTbl (col1, col2, col3) VALUES (?, ?, ?)";
cmd.Parameters.Add(new SqlCeParameter("p1", SqlDbType.Int));
cmd.Parameters.Add(new SqlCeParameter("p2", SqlDbType.NText));
cmd.Parameters.Add(new SqlCeParameter("p3", SqlDbType.Money));
cmd.Parameters["p2"].Size = 50;
cmd.Prepare();
cmd.Parameters["p1"].Value = 1;
cmd.Parameters["p2"].Value = "abc";
cmd.Parameters["p3"].Value = 15.66;
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
cmd.CommandText = "SELECT * From TestTbl";
SqlCeDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
{
MessageBox.Show(" col1 = " + rdr.GetInt32(0) +
" col2 = " + rdr.GetString(1) +
" col3 = " + rdr.GetSqlMoney(2));
}
}
catch (Exception err) { MessageBox.Show("ERROR! : " + err.ToString()); }
finally { conn.Close(); }
}
}
}