vb.net怎樣對datagridview中數(shù)據(jù)模糊查詢？

把DGV數(shù)據(jù)放到datatable DataTable dt = new DataTable(); for (int j = 0; j ucgrd.Columns.Count; j++) { dt.Columns.Add(ucgrd.Columns[j].HeaderCell.Value.ToString()); } for (int j = 0; j ucgrd.Rows.Count; j++) { DataRow dr = dt...

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在vb.net中如何查詢MDB數(shù)據(jù)庫的數(shù)據(jù)

以下是完整模塊

Imports

System.Data

Imports

System.IO

Imports

System.Data.OleDb

Module

Module1

Public

cn

As

New

OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data

Source="

Application.StartupPath

"\mdb數(shù)據(jù)庫名字.mdb")

'定義連接

Public

DataBaseRST

As

Integer

'用來返回數(shù)據(jù)庫執(zhí)行結果

Public

Function

DataModify(ByVal

str

As

String)

As

Boolean

'進行數(shù)據(jù)庫修改操作

Dim

cmdinsert

As

New

OleDbCommand

Try

cmdinsert.CommandText

=

str

cmdinsert.Connection

=

cn

If

cn.State

=

ConnectionState.Closed

Then

cn.Open()

DataBaseRST

=

cmdinsert.ExecuteNonQuery()

'用來返回執(zhí)行的結果

cn.Close()

Return

True

Catch

ex

As

Exception

MessageBox.Show(Err.Description,

"Error",

MessageBoxButtons.OK,

MessageBoxIcon.Error)

Return

False

End

Try

End

Function

Public

Function

Search(ByVal

str

As

String,

ByVal

DGV

As

DataGridView)

As

Boolean

'查詢

str---查詢命令，DGV---DataGridView，用來顯示數(shù)據(jù)的控件

Dim

tb

As

New

DataTable

Try

Dim

ap

As

New

OleDb.OleDbDataAdapter(str,

cn)

ap.Fill(tb)

DGV.DataSource

=

tb

Return

True

Catch

ex

As

Exception

MessageBox.Show(Err.Description,

"Error",

MessageBoxButtons.OK,

MessageBoxIcon.Error)

Return

False

End

Try

End

Function

End

Module

'以下是調用方法

DataModify("

insert

into

aa

values

('1','2')")'-------這里是數(shù)據(jù)庫更新操作

Search("select

bb

from

aa",DataGridView1)'-----------這里是數(shù)據(jù)表查詢操作

VB.NET 查詢數(shù)據(jù)庫內容

Try

gogoodsinfo.View(" where 商品編號='" + TextBox1.Text.replace("'","''") + "'")

Catch ex As Exception

messagebox.show("錯誤信息："+ex.tostring(),"提示")

End Try

你試一下，把我這句給復制過去看是否報錯，左邊條件要有空格，右邊要有取代函數(shù)！

vb.net數(shù)據(jù)庫查詢

select * from 表 where

(case when 條件 then 1 else 0 end+

case when 條件 then 1 else 0 end+

case when 條件 then 1 else 0 end+

case when 條件 then 1 else 0 end+

case when 條件 then 1 else 0 end) BETWEEN 2 and 5

vb.net 中如何使用SQL語句查詢數(shù)據(jù)庫

dim

myselectquery

as

string

=

"select

*

from

表1

where

姓名='小強'"

dim

mycommand

as

new

sqlcommand

(myselectquery,

conn)

'建立一個command控件，conn是你的sqlconnection對象

conn.open()'打開數(shù)據(jù)連接

dim

myreader

as

sqldatareader'定義一個reader用來讀數(shù)據(jù)

myreader

=

mycommand.executereader()'運行你的查詢，結果到myreader

if

myreader.read()

then

'如果查到了數(shù)據(jù)

msgbox(myreader.getstring(0))

'顯示第一個字段

end

if