ITEEDU

26.1.19.1. ADO: rs.addNew, rs.delete和rs.update

在下面的ADO(ActiveX数据对象)示例中,创建了表my_ado,并演示了rs.addNew、rs.delete和rs.update的用法。

Private Sub myodbc_ado_Click()
 
Dim conn As ADODB.Connection
Dim rs As ADODB.Recordset
Dim fld As ADODB.Field
Dim sql As String
 
'connect to MySQL server using MySQL ODBC 3.51 Driver(使用MySQL ODBC 3.51驱动程序连接到MySQL服务器)
Set conn = New ADODB.Connection
conn.ConnectionString = "DRIVER={MySQL ODBC 3.51 Driver};"_
                      & "SERVER=localhost;"_
                      & " DATABASE=test;"_
                      & "UID=venu;PWD=venu; OPTION=3"
 
conn.Open
 
'create table(创建表)
conn.Execute "DROP TABLE IF EXISTS my_ado"
conn.Execute "CREATE TABLE my_ado(id int not null primary key, name varchar(20)," _
                               & "txt text, dt date, tm time, ts timestamp)"
 
'direct insert(直接插入)
conn.Execute "INSERT INTO my_ado(id,name,txt) values(1,100,'venu')"
conn.Execute "INSERT INTO my_ado(id,name,txt) values(2,200,'MySQL')"
conn.Execute "INSERT INTO my_ado(id,name,txt) values(3,300,'Delete')"
 
Set rs = New ADODB.Recordset
rs.CursorLocation = adUseServer
 
'fetch the initial table ..(获取初始表…)
rs.Open "SELECT * FROM my_ado", conn
  Debug.Print rs.RecordCount
  rs.MoveFirst
  Debug.Print String(50, "-") & "Initial my_ado Result Set " & String(50, "-")
  For Each fld In rs.Fields
    Debug.Print fld.Name,
    Next
    Debug.Print
 
    Do Until rs.EOF
    For Each fld In rs.Fields
    Debug.Print fld.Value,
    Next
    rs.MoveNext
    Debug.Print
  Loop
rs.Close
 
'rs insert(rs插入)
rs.Open "select * from my_ado", conn, adOpenDynamic, adLockOptimistic
rs.AddNew
rs!Name = "Monty"
rs!txt = "Insert row"
rs.Update
rs.Close
 
'rs update(rs更新)
rs.Open "SELECT * FROM my_ado"
rs!Name = "update"
rs!txt = "updated-row"
rs.Update
rs.Close
 
'rs update second time..(rs更新第2次…)
rs.Open "SELECT * FROM my_ado"
rs!Name = "update"
rs!txt = "updated-second-time"
rs.Update
rs.Close
 
'rs delete(rs删除)
rs.Open "SELECT * FROM my_ado"
rs.MoveNext
rs.MoveNext
rs.Delete
rs.Close
 
'fetch the updated table ..(获取更新的表…)
rs.Open "SELECT * FROM my_ado", conn
  Debug.Print rs.RecordCount
  rs.MoveFirst
  Debug.Print String(50, "-") & "Updated my_ado Result Set " & String(50, "-")
  For Each fld In rs.Fields
    Debug.Print fld.Name,
    Next
    Debug.Print
 
    Do Until rs.EOF
    For Each fld In rs.Fields
    Debug.Print fld.Value,
    Next
    rs.MoveNext
    Debug.Print
  Loop
rs.Close
conn.Close
End Sub