VB.net+SQLite 轻量级数据库连接

今天朋友有介绍Sqlite 轻量级数据库,发现用处蛮大的。

研究了下 蛮好用的，比调用excel之类的好用多了

下面介绍如何用把SQlite和VB.net连接起来查询

我用的是VS2005

1.引用System.Data.SQLite 如果是VS2005那System.Data.SQLite得版本要选择对应的支持Fwork 2.0的

2,写代码

我把链接数据库改成了类似SQLHelper的类，方便以后引用如Button2的查询

Button1的查询就是基本的链接方法

SQLhelper在我的资源里有，大家可以下载

Imports System
Imports System.Data.SQLite
Imports System.Data

Public Class Form1
    ' Dim constr As String = "data source= E:SQLitemydatabase.sqlite"
    Dim str As String = Application.StartupPath & "mydatabase.sqlite"
    Dim constr As String = "data source= " & str & ""
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim SQLconn As New Data.SQLite.SQLiteConnection '定义数据库链接
        Dim sqlcmd As New SQLite.SQLiteCommand '定义查询操作
        Dim ds As New DataSet
        Dim salda As New SQLite.SQLiteDataAdapter
        Try
            SQLconn.ConnectionString = constr '链接数据库
            SQLconn.Open()
            sqlcmd.Connection = SQLconn
            sqlcmd.CommandText = "select * from t_emp"
            Dim sqlreader As SQLite.SQLiteDataReader = sqlcmd.ExecuteReader
            salda = New SQLite.SQLiteDataAdapter(sqlcmd.CommandText, SQLconn)

            salda.Fill(ds, 0)
            DGV1.DataSource = ds.Tables(0)


        Finally
            If Not (SQLconn Is Nothing) Then SQLconn.Dispose()
            SQLconn = Nothing
            If Not (salda Is Nothing) Then salda.Dispose()
            salda = Nothing
        End Try
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim sql As String = "select * from t_emp"
        Dim ds As DataSet
        ds = SQLiteHelper.ExecuteDataset(constr, CommandType.Text, sql)
        DGV1.DataSource = ds.Tables(0)
    End Sub
End Class