处理数据库函数

本文介绍了一个用于执行SQL语句的VBA公共函数,该函数能够处理包括INSERT、DELETE、UPDATE在内的多种SQL操作,并能返回查询结果集。

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处理数据库中数据常用的一个函数:

Public Function ExecuteSQL(ByVal sql As String, ByVal msgstring As String) As ADODB.Recordset

Dim cnn As ADODB.Connection 1. 定义一个连接

Dim rst As ADODB.Recordset 2. 定义一个记录集

Dim stokens() As String

Dim connectionstring As String

connectionstring = "filedsn=andy.dsn;UID=sa;pwd=123456"

On Error GoTo Executesql_error

stokens() = Split(sql) 'sql 中字符串中的每个单词,分别赋给一维数组的每个单位

Set cnn = New ADODB.Connection 3. 实例化连接

cnn.Open connectionstring 4. 打开连接,让程序连接到特定的数据库

' 如果有 insertdeleteupdate 语句可以直接执行 sql 语句而不用去查询, connectioncommandrecordset 都可以执行 sql 语句

If InStr("INSERT,DELETE,UPDATE", UCase$(stokens(0))) Then

cnn.Execute sql 5. 执行 sql 语句( updatedeleteinsert

msgstring = stokens(0) & "query sucessfully!" ‘执行成功!

Else

' 查询记录集,并且返回记录集

Set rst = New ADODB.Recordset

rst.CursorLocation = adUseClient ' 远程数据服务用法 当用于客户端 (ADOR) Recordset Connection 对象时,只能将 CursorLocation 属性设置为 adUseClient

rst.Open Trim$(sql), cnn, adOpenKeyset, adLockOptimistic6.select 语句返回一个记录集 (rst)rst.open “select * from student _info”,cnn,adopenkeyset,adlockoptimistic

' 打开一个数据库元素,此元素可提供对表的记录、查询的结果或保存的 Recordset 的访问。

Set ExecuteSQL = rst

msgstring = " 查询到 " & rst.RecordCount & " 条记录 "

End If

Executesql_exit:

Set rst = Nothing

Set cnn = Nothing

Exit Function

Executesql_error:

msgstring = " 查询错误: " & Err.decription

Resume Executesql_exit

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