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C#銜接當地.mdf文件:項目中右鍵點擊,新增——數據——基於辦事的數據庫,項面前目今直接生成.mdf數據庫文件,後台(數據庫的寫入用參數傳遞):
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
namespace ADO.NET
{
class Program
{
static void Main(string[] args)
{
//SQLServer 附加mdf文件
string dataDir = AppDomain.CurrentDomain.BaseDirectory;
if (dataDir.EndsWith(@"\bin\Debug\") || dataDir.EndsWith(@"\bin\Release\"))
{
dataDir = System.IO.Directory.GetParent(dataDir).Parent.Parent.FullName;
AppDomain.CurrentDomain.SetData("DataDirectory", dataDir);
}
using (SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True;User Instance=True"))
{
conn.Open();
//寫入一條數據
string strUserName = "功課本";
string strPWD = "Ab123456";
using (SqlCommand sqlCmd = conn.CreateCommand())
{
sqlCmd.CommandText = "insert into Mytable1(Name,Password) values (@UserName,@PWD) ";//銜接字符串停止參數化
SqlParameter[] sqlPara = new SqlParameter[] {
new SqlParameter("UserName",strUserName),
new SqlParameter("PWD",strPWD)
};
sqlCmd.Parameters.AddRange(sqlPara); //把Paramerter 數組參數添加到sqlCmd中
sqlCmd.ExecuteNonQuery();
Console.WriteLine("Insert OK");
}
//從表中讀取數據
string strRead = "SELECT ID, Name, Password FROM MyTable1 ";
using (SqlCommand sqlCmd = new SqlCommand(strRead, conn))
{
//sqlDataReader 逐行讀取數據
using (SqlDataReader sdr = sqlCmd.ExecuteReader())
{
while (sdr.Read())
{
int id = sdr.GetInt32(sdr.GetOrdinal("ID")); //sdr.GetOrdinal 獲得列的序號
string Name = sdr.GetString(sdr.GetOrdinal("Name"));
bool PWD = sdr.IsDBNull(sdr.GetOrdinal("Password"));
Console.WriteLine("ID:{0},Name:{1},PWD:{2}", id, Name, PWD);
Console.WriteLine(sdr.GetString(1));
}
}
}
conn.Close();//此處可以省略,Dispose()辦法會主動檢討
}
}
}
}