本文介绍了如何使用文本框传递表名称的参数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧! 问题描述 嗨 在这里,我传递了一张Table Giving表的名字。 但是现在我想要通过表名文本框。我试过很多方法来传递表名的值。 请帮助代码。 我猜它会起作用 string tablename = txtSearch.Text; 字符串 query = 从数据库中选择*其中tablename = @ tablename; 什么是确切查询。 如何修改它以便从文本框中读取。 private void btnSearch_Click( object sender,EventArgs e) { connection.Open(); 尝试 { OleDbCommand command = new 的OleDbCommand(); command.Connection = connection; string query = 从TestTable中选择* ; command.CommandText = query; OleDbDataAdapter da = new OleDbDataAdapter(command); DataTable dt = new DataTable(); da.Fill(dt); dataGridView1.DataSource = dt; command.ExecuteNonQuery(); } catch (Exception ex) { MessageBox.Show(ex的ToString()); } connection.Close(); } 解决方案 如果你想要的只是更改表的名称并从表中获取所有列,您可以使用 String.Format [ ^ ]方法。 示例: 字符串 query = 字符串 .Format( 选择*从{0},txtSearch.Text); 如果您想要更高级的查询,您应该关注解决方案1中的建议。 不确定你想要什么,但是...... MS Access提供了一种创建方法 pa rametrized query [ ^ ]。 PARAMETERS [myParam] CHAR ; SELECT < FieldList> FROM TableName WHERE FieldName = [myParam]; 现在,您需要创建 OleDbCommand with parameters(s) [ ^ ]。使用 AddWithValue [ ^ ]方法:) 谢谢Sir先生工作良好。 非常感谢你。 private void btnSearch_Click(object sender,EventArgs e) { connection.Open( ); 尝试 { OleDbCommand command = new OleDbCommand(); command.Connection = connection; string tablename = Txt_Search.Text; String query = String.Format(Select * from {0},Txt_Search.Text ); command.CommandText = query; OleDbDataAdapter da = new OleDbDataAdapter(command); DataTable dt = new DataTable(); da.Fill(dt); dataGridView1.DataSource = dt; // command.ExecuteNonQuery(); } catch(exception ex) { MessageBox.Show(ex.ToString()); } connection.Close(); } HiHere I passed a Table Giving table's Name.But Now i want to Pass Table's Name through textbox. I tried in many ways to pass values for table's name. Please help with code.I am guessing It would work asstring tablename = txtSearch.Text;String query = "Select * from Database Where tablename=@tablename";What is exact query. How to modify it to read from textbox.private void btnSearch_Click(object sender, EventArgs e){connection.Open();try{OleDbCommand command = new OleDbCommand();command.Connection = connection;string query = "Select * from TestTable";command.CommandText = query;OleDbDataAdapter da = new OleDbDataAdapter(command);DataTable dt = new DataTable();da.Fill(dt);dataGridView1.DataSource = dt;command.ExecuteNonQuery();}catch(Exception ex){MessageBox.Show(ex.ToString());}connection.Close();} 解决方案 If the only thing you want is to change the name of the table and get all columns from the table, you can use the String.Format[^] method.Example:String query = String.Format("Select * from {0}", txtSearch.Text);If you want a more advanced query you should follow the advice in Solution 1.Not sure what you want, but...MS Access provides a way to create parametrized query[^].PARAMETERS [myParam] CHAR;SELECT <FieldList>FROM TableNameWHERE FieldName = [myParam];Now, you need to create OleDbCommand with parameter(s)[^]. It's quite simple with AddWithValue[^] method :)Thank You Sir Its working Good.Thank You So Much.private void btnSearch_Click(object sender, EventArgs e) { connection.Open(); try { OleDbCommand command = new OleDbCommand(); command.Connection = connection; string tablename = Txt_Search.Text; String query = String.Format("Select * from {0}", Txt_Search.Text); command.CommandText = query; OleDbDataAdapter da = new OleDbDataAdapter(command); DataTable dt = new DataTable(); da.Fill(dt); dataGridView1.DataSource = dt; // command.ExecuteNonQuery(); } catch(Exception ex) { MessageBox.Show(ex.ToString()); } connection.Close(); } 这篇关于如何使用文本框传递表名称的参数的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持! 11-01 14:09