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1、第五講 Command對(duì)象四、案例（在小型超市管理系統(tǒng)中的實(shí)現(xiàn)）l SqlCommand .CommandType= CommandType.Text（SQL命令）的例子功能描述：實(shí)現(xiàn)對(duì)表tbYHXXB（用戶信息表【由用戶ID、用戶名、密碼、用戶類型4個(gè)字段構(gòu)成】，如下圖）的添加、修改和刪除，沒有返回結(jié)果，操作結(jié)果看表的內(nèi)容變化代碼參看附錄1l SqlCommand .CommandType= CommandType.StoredProcedure（存儲(chǔ)過程）的例子用到SqlParameter對(duì)象功能描述：實(shí)現(xiàn)對(duì)表tbYHXXB（用戶信息表）的添加、修改和刪除，沒有返回結(jié)果，操作結(jié)果看表的內(nèi)容

2、變化代碼參看附錄2l SqlCommand .CommandType= CommandType. TableDirect（表）的例子功能描述：打開表tbYHXXB（用戶信息表），用ExcuteReader方法實(shí)現(xiàn)。代碼參看附錄3五、上機(jī)實(shí)踐仿照【案例】上機(jī)練習(xí)，驗(yàn)證。運(yùn)行界面如下圖【附錄1】提示：MySQL為前面創(chuàng)建的動(dòng)態(tài)鏈接庫(kù)ClassLibOfSuperMarket.dllprivate void button1_Click(object sender, EventArgs e) /用SQL命令添加一個(gè)用戶:“10001,張三，收銀員” MySQL getConn=new MySQL();

3、 SqlConnection theConn = null; try theConn = getConn.GetConnetion(); theConn.Open(); SqlCommand sqlCmd = new SqlCommand(); sqlCmd.Connection = theConn; sqlCmd.CommandType = CommandType.Text; sqlCmd.CommandText = "Insert Into tbYHXXB Values('10001','張三','','收銀員')&

4、quot; sqlCmd.ExecuteNonQuery(); catch (SqlException sqlEx) MessageBox.Show(sqlEx.Message, "SQL錯(cuò)誤", MessageBoxButtons.OK, MessageBoxIcon.Error); catch(Exception Ex) MessageBox.Show(Ex.Message, "SQL錯(cuò)誤", MessageBoxButtons.OK, MessageBoxIcon.Error); finally if (theConn.State = System

5、.Data.ConnectionState.Open) theConn.Close(); MessageBox.Show("記錄添加成功！請(qǐng)查看數(shù)據(jù)庫(kù)中的表tbYHXXB", "添加記錄", MessageBoxButtons.OK, MessageBoxIcon.Information); private void button2_Click(object sender, EventArgs e) /用SQL命令修改用戶參數(shù):將“10001,張三，收銀員”改為 /“10001,我的名字，經(jīng)理” MySQL getConn = new MySQL();

6、SqlConnection theConn = null; try theConn = getConn.GetConnetion(); theConn.Open(); SqlCommand sqlCmd = new SqlCommand(); sqlCmd.Connection = theConn; sqlCmd.CommandType = CommandType.Text; sqlCmd.CommandText = "Update tbYHXXB Set 用戶名='我的名字',密碼='',用戶類型='經(jīng)理'" sqlCmd.

7、ExecuteNonQuery(); catch (SqlException sqlEx) MessageBox.Show(sqlEx.Message, "SQL錯(cuò)誤", MessageBoxButtons.OK, MessageBoxIcon.Error); catch (Exception Ex) MessageBox.Show(Ex.Message, "SQL錯(cuò)誤", MessageBoxButtons.OK, MessageBoxIcon.Error); finally if (theConn.State = System.Data.Connec

8、tionState.Open) theConn.Close(); MessageBox.Show("記錄修改成功！請(qǐng)查看數(shù)據(jù)庫(kù)中的表tbYHXXB", "修改記錄", MessageBoxButtons.OK, MessageBoxIcon.Information); private void button3_Click(object sender, EventArgs e) /用SQL命令刪除一個(gè)用戶:“10001,張三，收銀員” MySQL getConn = new MySQL(); SqlConnection theConn = null; tr

9、y theConn = getConn.GetConnetion(); theConn.Open(); SqlCommand sqlCmd = new SqlCommand(); sqlCmd.Connection = theConn; sqlCmd.CommandType = CommandType.Text; sqlCmd.CommandText = "Delete from tbYHXXB where 用戶ID='10001'" sqlCmd.ExecuteNonQuery(); catch (SqlException sqlEx) MessageBo

10、x.Show(sqlEx.Message, "SQL錯(cuò)誤", MessageBoxButtons.OK, MessageBoxIcon.Error); catch (Exception Ex) MessageBox.Show(Ex.Message, "SQL錯(cuò)誤", MessageBoxButtons.OK, MessageBoxIcon.Error); finally if (theConn.State = System.Data.ConnectionState.Open) theConn.Close(); MessageBox.Show("

11、記錄刪除成功！請(qǐng)查看數(shù)據(jù)庫(kù)中的表tbYHXXB", "刪除記錄", MessageBoxButtons.OK, MessageBoxIcon.Information); 【附錄2】：private void button4_Click(object sender, EventArgs e) /調(diào)用存儲(chǔ)過程AddUser添加一個(gè)用戶:“10001,張三，收銀員” MySQL getConn = new MySQL(); SqlConnection theConn = null; try theConn = getConn.GetConnetion(); theCon

12、n.Open(); SqlCommand sqlCmd = new SqlCommand(); sqlCmd.Connection = theConn; sqlCmd.CommandType = CommandType.StoredProcedure; sqlCmd.CommandText = "AddUser" SqlParameter UserID = new SqlParameter(); UserID.ParameterName = "UserID" UserID.Value = "10001" UserID.DbType =

13、 DbType.String; UserID.Direction = ParameterDirection.Input; SqlParameter UserName = new SqlParameter(); UserName.ParameterName = "UserName" UserName.Value = "張三" UserName.DbType = DbType.String; UserName.Direction = ParameterDirection.Input; SqlParameter Pwd= new SqlParameter();

14、 Pwd.ParameterName = "Pwd" Pwd.Value = "" Pwd.DbType = DbType.String; Pwd.Direction = ParameterDirection.Input; SqlParameter UserType = new SqlParameter(); UserType.ParameterName = "Type" UserType.Value = "收銀員" UserType.DbType = DbType.String; UserType.Directi

15、on = ParameterDirection.Input; sqlCmd.Parameters.Add(UserID); sqlCmd.Parameters.Add(UserName); sqlCmd.Parameters.Add(Pwd); sqlCmd.Parameters.Add(UserType); sqlCmd.ExecuteNonQuery(); catch (SqlException sqlEx) MessageBox.Show(sqlEx.Message, "SQL錯(cuò)誤", MessageBoxButtons.OK, MessageBoxIcon.Erro

16、r); catch (Exception Ex) MessageBox.Show(Ex.Message, "SQL錯(cuò)誤", MessageBoxButtons.OK, MessageBoxIcon.Error); finally if (theConn.State = System.Data.ConnectionState.Open) theConn.Close(); MessageBox.Show("記錄添加成功！請(qǐng)查看數(shù)據(jù)庫(kù)中的表tbYHXXB", "添加記錄", MessageBoxButtons.OK, MessageBoxI

17、con.Information); private void button5_Click(object sender, EventArgs e) /調(diào)用存儲(chǔ)過程ModiUser修改用戶:“12345,玉溪，經(jīng)理” MySQL getConn = new MySQL(); SqlConnection theConn = null; try theConn = getConn.GetConnetion(); theConn.Open(); SqlCommand sqlCmd = new SqlCommand(); sqlCmd.Connection = theConn; sqlCmd.Comman

18、dType = CommandType.StoredProcedure; sqlCmd.CommandText = "ModiUser" SqlParameter UserID = new SqlParameter(); UserID.ParameterName = "UserID" UserID.Value = "12345" UserID.DbType = DbType.String; UserID.Direction = ParameterDirection.Input; SqlParameter UserName = new

19、SqlParameter(); UserName.ParameterName = "UserName" UserName.Value = "玉溪" UserName.DbType = DbType.String; UserName.Direction = ParameterDirection.Input; SqlParameter Pwd = new SqlParameter(); Pwd.ParameterName = "Pwd" Pwd.Value = "" Pwd.DbType = DbType.String

20、; Pwd.Direction = ParameterDirection.Input; SqlParameter UserType = new SqlParameter(); UserType.ParameterName = "Type" UserType.Value = "經(jīng)理" UserType.DbType = DbType.String; UserType.Direction = ParameterDirection.Input; sqlCmd.Parameters.Add(UserID); sqlCmd.Parameters.Add(UserN

21、ame); sqlCmd.Parameters.Add(Pwd); sqlCmd.Parameters.Add(UserType); sqlCmd.ExecuteNonQuery(); catch (SqlException sqlEx) MessageBox.Show(sqlEx.Message, "SQL錯(cuò)誤", MessageBoxButtons.OK, MessageBoxIcon.Error); catch (Exception Ex) MessageBox.Show(Ex.Message, "SQL錯(cuò)誤", MessageBoxButtons

22、.OK, MessageBoxIcon.Error); finally if (theConn.State = System.Data.ConnectionState.Open) theConn.Close(); MessageBox.Show("記錄修改成功！請(qǐng)查看數(shù)據(jù)庫(kù)中的表tbYHXXB", "添加記錄", MessageBoxButtons.OK, MessageBoxIcon.Information); private void button6_Click(object sender, EventArgs e) /調(diào)用存儲(chǔ)過程DeliUser刪

23、除用戶:“12345,玉溪，經(jīng)理” MySQL getConn = new MySQL(); SqlConnection theConn = null; try theConn = getConn.GetConnetion(); theConn.Open(); SqlCommand sqlCmd = new SqlCommand(); sqlCmd.Connection = theConn; sqlCmd.CommandType = CommandType.StoredProcedure; sqlCmd.CommandText = "DelUser" SqlParamete

24、r UserID = new SqlParameter(); UserID.ParameterName = "UserID" UserID.Value = "" UserID.DbType = DbType.String; UserID.Direction = ParameterDirection.Input; sqlCmd.Parameters.Add(UserID); sqlCmd.ExecuteNonQuery(); catch (SqlException sqlEx) MessageBox.Show(sqlEx.Message, "SQ

25、L錯(cuò)誤", MessageBoxButtons.OK, MessageBoxIcon.Error); catch (Exception Ex) MessageBox.Show(Ex.Message, "SQL錯(cuò)誤", MessageBoxButtons.OK, MessageBoxIcon.Error); finally if (theConn.State = System.Data.ConnectionState.Open) theConn.Close(); MessageBox.Show("記錄刪除成功！請(qǐng)查看數(shù)據(jù)庫(kù)中的表tbYHXXB", "添加記錄", MessageBoxButtons.OK, MessageBoxIcon.Information); 【

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