就寫(xiě)一個(gè)簡(jiǎn)單連接數(shù)據(jù)庫(kù)示例

新建一個(gè)Winfrom窗體

在添加一個(gè)button控件

下面的代碼我全部注釋了

連接數(shù)據(jù)庫(kù)示例如下代碼

?

?private void button1_Click(object sender, EventArgs e)
??????? {
??????????? try
??????????? {
??????????????? //server，代表服務(wù)器地址；intergrated security，標(biāo)識(shí)認(rèn)證方式，此處采用的windows集成驗(yàn)證方式；
??????????????? //database代表要訪問(wèn)的數(shù)據(jù)庫(kù)
??????????????? //使用windows集成驗(yàn)證方式
??????????????? // string strDB = "server=(local);integrated security=SSPI;database=Stu";

??????????????? //使用數(shù)據(jù)庫(kù)用戶(hù)名密碼訪問(wèn)
??????????????? string strDB = "server=(local);database=Stu;uid=sa;pwd=mima";

??????????????? //聲明概要執(zhí)行的數(shù)據(jù)庫(kù)命令
??????????????? string strcmd = "SELECT COUNT(*) FROM student";

??????????????? //創(chuàng)建Connection對(duì)象
??????????????? SqlConnection connection = new SqlConnection(strDB);

??????????????? //創(chuàng)建Command對(duì)象
??????????????? SqlCommand sqlCmd = new SqlCommand(strcmd,connection);

??????????????? //打開(kāi)數(shù)據(jù)庫(kù)
??????????????? connection.Open();

??????????????? //調(diào)用ExecuteScalar方法，返回查詢(xún)的值，注意，此方法返回是表中的第一行第一列
??????????????? int count = (int)sqlCmd.ExecuteScalar();

?????????????? // MessageBox.Show("打開(kāi)數(shù)據(jù)庫(kù)連接");

??????????????? //關(guān)閉數(shù)據(jù)庫(kù)
??????????????? connection.Close();

?????????????? // MessageBox.Show("關(guān)閉數(shù)據(jù)庫(kù)連接");
??????????????? MessageBox.Show("學(xué)生人數(shù)為:"+ count.ToString() +"人！");
??????????? }
??????????? catch (SqlException ex)
??????????? {

??????????????? MessageBox.Show(ex.Message);
??????????????
??????????? }
??????????? finally
??????????? {
?
??????????? }
?????
??????? }

?

轉(zhuǎn)載于:https://www.cnblogs.com/LeeYongze/archive/2009/11/05/1596897.html

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