需求：使用Excel做一个简单的数据库连接工具(类似于java中的AWT和SWING)。
- 可以查询数据库的表
- 查询各个表内的数据
- 插入/修改各个表的数据
步骤：
- 先建立一个UserForm作为主界面，并放置按钮，如下图所示。
然后双击中间的“连接数据库”按钮，进行代码编辑。
Private Sub CommandButton1_Click()
Dim strConn As String
Dim dbConn As Object
Dim resSet As Object
Dim db_sid, db_user, db_pass As String
db_sid = "edu-server.yds.yd:1521/orcl.yds.yd"
db_user = "root"
db_pass = "123456"
Set dbConn = CreateObject("ADODB.Connection")
Set resSet = CreateObject("ADODB.Recordset")
strConn = "Provider=OraOLEDB.Oracle.1; user id=" & db_user & "; password=" & db_pass & "; data source = " & db_sid & "; Persist Security Info=True"
//清空sheet1
Sheets("Sheet1").Range("1:65536").ClearContents
dbConn.Open strConn
//查询当前数据库所有表名
Set resSet = dbConn.Execute("select table_name from user_tables")
//将表名放入sheet1中
For j = 0 To resSet.Fields.Count - 1
Cells(1, j + 1) = resSet.Fields(j).Name
Next
//将Sheet1中的A2:A20(A20写成了固定的，也可以写成变量)放到主界面中，下面是主界面
UserForm2.ListBox1.RowSource = "Sheet1!A2:A20"
Range("A2").CopyFromRecordset resSet
//跳转到主界面
UserForm2.Show 0
//隐藏当前界面
UserForm1.Hide
dbConn.Close
End Sub
- 使用UserForm创建一个主界面，并放入一些控件，如下图。
左侧空白部分是一个ListBox，点击步骤1界面的“连接数据库”按钮后，跳转到当前步骤的界面，并将表明显示到左侧的ListBox中，效果图如下。
双击“查询”按钮，进入到查询功能编写。
Private Sub CommandButton1_Click()
Dim strConn As String
Dim strSql As String
Dim iCount As Integer
Dim whm As Worksheet
Dim dbConn As Object
Dim resSet As Object
Dim db_sid, db_user, db_pass As String
db_sid = "edu-server.yds.yd:1521/orcl.yds.yd"
db_user = "root"
db_pass = "123456"
Set dbConn = CreateObject("ADODB.Connection")
Set resSet = CreateObject("ADODB.Recordset")
strConn = "Provider=OraOLEDB.Oracle.1; user id=" & db_user & "; password=" & db_pass & "; data source = " & db_sid & "; Persist Security Info=True"
//根据鼠标选中的表名拼接sql
strSql = "select * from " & ListBox1.Value
//判断sheet2是否存在
If ActiveSheet.Name = "Sheet2" Then
//存在就清空sheet2
Sheets("Sheet2").Range("1:65536").ClearContents
Else
//不存在就创建sheet2
Worksheets.Add.Name = "Sheet2"
End If
dbConn.Open strConn
//执行sql
Set resSet = dbConn.Execute(strSql)
//将查询到的数据放入sheet2中
For j = 0 To resSet.Fields.Count - 1
Cells(1, j + 1) = resSet.Fields(j).Name
Next
Range("A2").CopyFromRecordset resSet
dbConn.Close
End Sub
效果图如下。
3.双击“更新”按钮，进入更新功能代码编写。
这里我的想法是将插入和修改放到了一起,点击“更新”按钮会后，先清空当前表
,再将sheet2中的数据全部插入到表中,这样就将插入和修改整合到了一起，但是效率可能会低.
Private Sub CommandButton2_Click()
Dim strConn1 As String
Dim truncateSql As String
Dim insertSql As String
Dim dbConn1 As Object
Dim resSet1 As Object
Dim maxRow As Integer
Dim maxColumn As Integer
Dim db_sid1, db_user1, db_pass1 As String
db_sid1 = "edu-server.yds.yd:1521/orcl.yds.yd"
db_user1 = "root"
db_pass1 = "123456"
Set dbConn1 = CreateObject("ADODB.Connection")
Set resSet1 = CreateObject("ADODB.Recordset")
//获取最大行数
maxRow = ActiveSheet.[A65536].End(xlUp).Row
//获取最大列数
maxColumn = ActiveSheet.[IV1].End(xlToLeft).Column
strConn1 = "Provider=OraOLEDB.Oracle.1; user id=" & db_user1 & "; password=" & db_pass1 & "; data source = " & db_sid1 & "; Persist Security Info=True"
//拼接清空表sql
truncateSql = "truncate table " & ListBox1.Value
//拼接插入sql
insertSql = "insert into " & ListBox1.Value & " values( "
dbConn1.Open strConn1
Set resSet1 = dbConn1.Execute(truncateSql)
//循环，第一行是表字段名，从第二行开始，j=2
For j = 2 To maxRow
//取每一行所有有效列的值，拼到插入语句的sql中
For i = 1 To maxColumn
If i = maxColumn Then
insertSql = insertSql & "'" & Cells(j, i) & "')"
Else
insertSql = insertSql & "'" & Cells(j, i) & "',"
End If
Next
//拼完插入语句的sql，就执行
Set resSet1 = dbConn1.Execute(insertSql)
//将sql重置成最初状态，以便下一行的拼接
insertSql = "insert into " & ListBox1.Value & " values( "
Next
//增删改需要提交事务，这里我不清楚需不需要，写上肯定没错
Set resSet1 = dbConn1.Execute("commit")
//弹出提示框，提示更新成功！
MsgBox prompt:=" 更新成功! "
dbConn1.Close
End Sub
效果图如下。
- 最后一步，在sheet1的ThisWorkBook中写入显示步骤1的连接界面代码。
至此，简单数据库连接功能都已完成，有需要的可以添加，我这个每次执行sql都需要连接数据库，关闭连接，没有优化，可以自行修改。
第一次使用的话需要将sheet2删除！不删可能会报错。
例子放入在了百度网盘，有需要的自取。
链接: https://pan.baidu.com/s/1tCix95JM17FMttFO4sTGMg 提取码: adxf 复制这段内容后打开百度网盘手机App，操作更方便哦
感谢阅读！