dim
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myselectquery
as
string
=
"select
*
from
表1
where
姓名='小強(qiáng)'"
dim
mycommand
as
new
sqlcommand
(myselectquery,
conn)
'建立一個(gè)command控件,conn是你的sqlconnection對(duì)象
conn.open()'打開(kāi)數(shù)據(jù)連接
dim
myreader
as
sqldatareader'定義一個(gè)reader用來(lái)讀數(shù)據(jù)
myreader
=
mycommand.executereader()'運(yùn)行你的查詢,結(jié)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(gè)字段
end
if
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
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(kù)名字.mdb")
'定義連接
Public
DataBaseRST
As
Integer
'用來(lái)返回?cái)?shù)據(jù)庫(kù)執(zhí)行結(jié)果
Public
Function
DataModify(ByVal
str
As
String)
As
Boolean
'進(jìn)行數(shù)據(jù)庫(kù)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(lái)返回執(zhí)行的結(jié)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(lái)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(diào)用方法
DataModify("
insert
into
aa
values
('1','2')")'-------這里是數(shù)據(jù)庫(kù)更新操作
Search("select
bb
from
aa",DataGridView1)'-----------這里是數(shù)據(jù)表查詢操作
當(dāng)前名稱:vb.net檢索數(shù)據(jù),vb查詢數(shù)據(jù)庫(kù)
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