com.CommandText = "insert into Table_1(会员名,密码,姓名,性别,出生日期,地址,电话,手机)" + "values('" + TextBox1.Text + "','" + TextBox2.Text + "','" + TextBox4.Text + "'," + "'" +DropDownList4.SelectedItem.Text + "','" + DropDownList1.SelectedItem.Text + "-" + DropDownList2.SelectedItem.Text + "-" + DropDownList3.SelectedItem.Text + "'," +"'"+TextBox5.Text + "','" + TextBox6.Text + "',"+"'" + TextBox7.Text + "')";
时间: 2023-07-04 17:10:52 浏览: 50
在这段代码中,有一个语法错误和一个逻辑错误:
语法错误:在 SQL 语句中,参数值之间应该使用逗号分隔,而不是中文逗号(,)。因此,需要将所有的中文逗号替换为英文逗号(,)。
逻辑错误:在 SQL 语句中,地址、电话和手机字段之间应该使用逗号分隔,而不是中文顿号(、)。因此,需要将所有的中文顿号替换为英文逗号(,)。
下面是修改后的代码:
```
com.CommandText = "insert into Table_1(会员名,密码,姓名,性别,出生日期,地址,电话,手机) values('" + TextBox1.Text + "','" + TextBox2.Text + "','" + TextBox4.Text + "','" + DropDownList4.SelectedItem.Text + "','" + DropDownList1.SelectedItem.Text + "-" + DropDownList2.SelectedItem.Text + "-" + DropDownList3.SelectedItem.Text + "','" + TextBox5.Text + "','" + TextBox6.Text + "','" + TextBox7.Text + "')";
```
相关问题
Imports System.Data.OleDb Public Class Form3 Dim con As New OleDbConnection Dim adp As New OleDbDataAdapter Dim ds As New DataSet Private Sub Form3_Load(sender As Object, e As EventArgs) Handles MyBase.Load con.ConnectionString = "Provider=SQLOLEDB;Data Source=.;Integrated Security=SSPI;Initial Catalog=students" Dim selectcmd As New OleDbCommand selectcmd.CommandText = "select * from student" selectcmd.Connection = con adp.SelectCommand = selectcmd adp.Fill(ds, "Table") End Sub Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click For Each txt As TextBox In Me.Controls.OfType(Of TextBox)() txt.Text = "" Next For Each combo As ComboBox In Me.Controls.OfType(Of ComboBox)() combo.Text = "" Next End Sub Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click Dim insecmd As New OleDbCommand Dim Vs As String = TextBox1.Text & "','" & TextBox2.Text & "','" & ComboBox1.Text & "','" & ComboBox2.Text & "'," & TextBox3.Text & ",'" & ComboBox3.Text & ComboBox4.Text & ComboBox5.Text & "','" & TextBox4.Text & "','" & ComboBox6.Text & "','" & TextBox5.Text & "')" insecmd.CommandText = "insert into student values('" & Vs insecmd.Connection = con adp.InsertCommand = insecmd adp.Update(ds) End Sub End Class这段代码有什么问题
这段代码有几个问题:
1. 连接字符串是针对 SQL Server 的,而不是 Access 数据库。应该使用 Access 数据库的连接字符串,例如:
```
con.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\MyDatabase.mdb"
```
2. 在插入数据时,字符串值应该使用参数化查询,而不是将值直接拼接到 SQL 语句中。这样可以避免 SQL 注入攻击,并且可以自动处理特殊字符的转义。应该改为类似下面的语句:
```
insecmd.CommandText = "insert into student values(?, ?, ?, ?, ?, ?, ?, ?, ?)"
insecmd.Parameters.AddWithValue("param1", TextBox1.Text)
insecmd.Parameters.AddWithValue("param2", TextBox2.Text)
'...
```
3. 在清空表单数据时,应该检查控件的类型是否为 TextBox 或 ComboBox,否则可能会出现异常。可以改为类似下面的语句:
```
For Each ctrl As Control In Me.Controls
If TypeOf ctrl Is TextBox Then
DirectCast(ctrl, TextBox).Text = ""
ElseIf TypeOf ctrl Is ComboBox Then
DirectCast(ctrl, ComboBox).Text = ""
End If
Next
```
4. 在插入数据后应该更新 DataSet 中的数据,以便在下一次查询中可以看到新插入的记录。可以改为类似下面的语句:
```
adp.Update(ds, "Table")
```
根据上述建议,可以将代码修改为:
```
Imports System.Data.OleDb
Public Class Form3
Dim con As New OleDbConnection
Dim adp As New OleDbDataAdapter
Dim ds As New DataSet
Private Sub Form3_Load(sender As Object, e As EventArgs) Handles MyBase.Load
con.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\MyDatabase.mdb"
Dim selectcmd As New OleDbCommand
selectcmd.CommandText = "select * from student"
selectcmd.Connection = con
adp.SelectCommand = selectcmd
adp.Fill(ds, "Table")
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
For Each ctrl As Control In Me.Controls
If TypeOf ctrl Is TextBox Then
DirectCast(ctrl, TextBox).Text = ""
ElseIf TypeOf ctrl Is ComboBox Then
DirectCast(ctrl, ComboBox).Text = ""
End If
Next
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim insecmd As New OleDbCommand
insecmd.CommandText = "insert into student values(?, ?, ?, ?, ?, ?, ?, ?, ?)"
insecmd.Parameters.AddWithValue("param1", TextBox1.Text)
insecmd.Parameters.AddWithValue("param2", TextBox2.Text)
insecmd.Parameters.AddWithValue("param3", ComboBox1.Text)
insecmd.Parameters.AddWithValue("param4", ComboBox2.Text)
insecmd.Parameters.AddWithValue("param5", TextBox3.Text)
insecmd.Parameters.AddWithValue("param6", ComboBox3.Text & ComboBox4.Text & ComboBox5.Text)
insecmd.Parameters.AddWithValue("param7", TextBox4.Text)
insecmd.Parameters.AddWithValue("param8", ComboBox6.Text)
insecmd.Parameters.AddWithValue("param9", TextBox5.Text)
insecmd.Connection = con
adp.InsertCommand = insecmd
adp.Update(ds, "Table")
End Sub
End Class
```
private void Keep_to_Table(DataTable dt,string column1,string row_name,string table_name) { using (SQLiteConnection connection = new SQLiteConnection(@"data source=C:\Users\魏艳\Desktop\sensor.db")) { // 打开数据库连接 connection.Open(); using (SQLiteCommand command = new SQLiteCommand()) { foreach (DataRow row in dt.Rows) { // 清除参数集合 command.Parameters.Clear(); // 设置要执行的 SQL 语句,将 DataTable 写入数据库表 command.CommandText = $"INSERT INTO [{table_name}] ({column1}) VALUES (@values1)"; // 请根据您的实际表格名称和列名进行替换 // 设置参数值 command.Parameters.AddWithValue("@values1", row[ row_name]); //command.Parameters.AddWithValue("@Speed", row["Speed"]); // 请根据您的实际列名进行替换 // 执行 SQL 命令 command.ExecuteNonQuery(); } } connection.Close(); } }错误原因
根据您提供的代码,出现错误的原因可能是以下几点:
1. 数据库文件路径错误:请确保数据库文件路径 `C:\Users\魏艳\Desktop\sensor.db` 是正确的。如果文件不存在或路径不正确,将导致连接失败。
2. 表名错误:请确保表名 `table_name` 是正确的。如果表不存在或表名不正确,将导致执行 SQL 语句失败。
3. 列名错误:请确保列名 `column1` 和 `row_name` 是正确的。如果列名不正确,将导致执行 SQL 语句失败。
4. 数据类型不匹配:请确保传递给 `AddWithValue()` 方法的参数值与数据库表中对应列的数据类型匹配。如果数据类型不匹配,将导致执行 SQL 语句失败。
请检查以上几点,并根据实际情况进行调整。如果问题仍然存在,请提供具体的错误消息或堆栈跟踪信息,以便更好地帮助您解决问题。