Question

我想让搜索结果准确无误。例如我输入＆＃34; L＆＃34;我的程序只显示任何带有字母＆＃34; L＆＃34;在其中，而不是显示第一个字母是＆＃34; L＆＃34;的结果。那怎么办呢？

这是我的代码：

***在搜索或在搜索框上输入之前，用户必须先选择一个单选按钮来搜索列中的数据，在我的程序中有3个单选按钮（ID，姓氏，名字）

 Private Sub txtSearch_TextChanged(sender As Object, e As EventArgs) Handles txtSearch.TextChanged
        Dim DataTable As New DataTable
        Dim DataAdapter As New MySqlDataAdapter
        MySqlConn = New MySqlConnection
        MySqlConn = New MySqlConnection("server=localhost;user id=root;password=root;database=PatientManagementSystem;")
        MySqlConn.Open()
        'SEARCH ID
        If rdbtnID.Checked = True Then
            txtSearch.MaxLength = 9
            With cmd
                .Connection = MySqlConn
                .CommandText = "SELECT * FROM newpatient WHERE ID like '%" & txtSearch.Text & "%'"
            End With
            DataAdapter.SelectCommand = cmd
            DataTable.Clear()
            DataAdapter.Fill(DataTable)
            dgvRecords.DataSource = DataTable
            MySqlConn.Close()
            'SEARCH LASTNAME
        ElseIf rdbtnLastname.Checked = True Then
            txtSearch.MaxLength = 32767
            With cmd
                .Connection = MySqlConn
                .CommandText = "select * from newpatient where Lastname like '%" & txtSearch.Text & "%'"
            End With
            DataAdapter.SelectCommand = cmd
            DataTable.Clear()
            DataAdapter.Fill(DataTable)
            dgvRecords.DataSource = DataTable
            MySqlConn.Close()
            'SEARCH FIRSTNAME
        ElseIf rdbtnFirstname.Checked = True Then
            txtSearch.MaxLength = 32767
            With cmd
                .Connection = MySqlConn
                .CommandText = "SELECT * FROM newpatient WHERE Firstname like '%" & txtSearch.Text & "%'"
            End With
            DataAdapter.SelectCommand = cmd
            DataTable.Clear()
            DataAdapter.Fill(DataTable)
            dgvRecords.DataSource = DataTable
            MySqlConn.Close()

        End If

    End Sub

Answer 1

您需要从头开始删除％like符号。

更改

"SELECT * FROM newpatient WHERE ID like '%" & txtSearch.Text & "%'"

成：

"SELECT * FROM newpatient WHERE ID like '" & txtSearch.Text & "%'"

我还建议：（1）如果这是一个生产系统，使用参数化的sql;（2）如果你坚持使用sql连接，你需要转义txtSearch.Text中的任何单引号，用户输入2个单引号。否则sql语句将失败。

搜索datagrid查看完全关键字

1 个答案: