学生信息管理系统代码
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主要代码如下：
1、登录界面代码：
Dim cn As New ADODB.Connection
Dim rst As New ADODB.Recordset
Private Sub Command1_Click()
Set cn = New ADODB.Connection
Set rst = New ADODB.Recordset
Static i%
cn.ConnectionString = "Provider=SQLOLEDB.1;Persist Security
Info=False;User ID=sa;Initial Catalog=students info;Data Source=C1847"
cn.Open
usna = Trim(Text1.Text)
mysql = "select * from 用户表 where 用户名='" & usna & "'"
rst.Open mysql, cn
If rst.EOF Then
MsgBox "用户名不存在！"
cn.Close
Text1.Text = ""
Text2.Text = ""
Text1.SetFocus
Else
If Trim(rst("密码")) = Trim(Text2.Text) Then
管理界面.Show
Else
i = i + 1
If i < 3 Then
MsgBox "用户名或密码错误！", vbOKOnly + vbExclamation, "警告"
cn.Close
Text2.Text = ""
Text1.Text = ""
Text1.SetFocus
Else
MsgBox "该用户已被锁定！", vbOKOnly + vbExclamation, "警告"
End If
End If
End If
End Sub
Private Sub Command2_Click() Text1.Text = ""
Text2.Text = ""
Text3.Text = ""
End Sub
2、管理界面代码：
Private Sub Sinsert_Click() 添加学生信息.Show
End Sub
Private Sub Sselect_Click() 查询学生信息.Show
End Sub
Private Sub sustu_Click()
查询更新学生信息.Show
End Sub
Private Sub xgmm_Click()
修改密码.Show
End Sub
Private Sub yhzc_Click()
用户注册.Show
End Sub
3、查询学生信息代码：
Dim cn As New ADODB.Connection
Dim rst As New ADODB.Recordset
Private Sub Command1_Click()
Set cn = New ADODB.Connection
Set rst = New ADODB.Recordset
cn.ConnectionString = "Provider=SQLOLEDB.1;Persist Security
Info=False;User ID=sa;Initial Catalog=students info;Data Source=C1847"
cn.Open
If Combo1.Text <> "" Then
mysql = "select * from 学生信息表 where 系别='" & Trim(Combo1.Text) & "'"
rst.Open mysql, cn
If rst.EOF Then
MsgBox "没有学生!", vbOKOnly + vbExclamation, "警告"
Combo1.Text = ""
Else
With MSFlexGrid1
.TextMatrix(0, 1) = "学号"
.TextMatrix(0, 2) = "姓名"
.TextMatrix(0, 3) = "性别"
.TextMatrix(0, 4) = "年龄"
.TextMatrix(0, 5) = "系别"
.TextMatrix(0, 6) = "班级"
MSFlexGrid1.Rows = 1 '每次查询自动定位到第一行
.Rows = .Rows + 1
.CellAlignment = 8
.TextMatrix(.Rows - 1, 1) = rst.Fields("学号")
.TextMatrix(.Rows - 1, 2) = rst.Fields("姓名")
.TextMatrix(.Rows - 1, 3) = rst.Fields("性别")
.TextMatrix(.Rows - 1, 4) = rst.Fields("年龄")
.TextMatrix(.Rows - 1, 5) = rst.Fields("系别")
.TextMatrix(.Rows - 1, 6) = rst.Fields("班级")
rst.MoveNext
Loop
End With
End If
ElseIf Combo2.Text <> "" Then
mysql = "select * from 学生信息表 where 班级='" & Trim(Combo2.Text) & "'"
rst.Open mysql, cn