怎样向表中进行增删改查_百度知道.mht

Sql对oracle数据库的基本语句

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<DIV class=3D"f14 p90 =
pl10"><CA>=D4=F5=D1=F9=D4=DAVB=D6=D0=B2=E5=C8=EB=D5=D5=C6=AC =
<BR>'=D2=FD=C8=EB=C3=FC=C3=FB=BF=D5=BC=E4 <BR>Imports=20
System.Data.SqlClient <BR><BR>Dim mycon As New SqlConnection("integrated =

security=3Dsspi;server=3D(local);" &amp; "database=3Dstudent") <BR>Dim =
filepath=20
<BR><BR>Private Sub Form10_Load(ByVal sender As System.Object, ByVal e =
As=20
System.EventArgs) Handles MyBase.Load <BR>Me.ComboBox1.Text =3D "" =
<BR>Dim mycmd=20
As New SqlCommand <BR>With mycmd <BR>mycmd.Connection =3D mycon=20
<BR>mycmd.CommandType =3D CommandType.Text <BR>mycmd.CommandText =3D =
"select * from=20
student" <BR>End With <BR>'=B4=F2=BF=AA=C1=AC=BD=D3 <BR>mycon.Open() =
<BR>'=D6=B4=D0=D0=CA=FD=BE=DD=C3=FC=C1=EE=B2=A2=B0=F3=B6=A8=BF=D8=BC=FE =
<BR>Dim=20
myreader As SqlDataReader <BR>myreader =3D mycmd.ExecuteReader <BR>If=20
myreader.HasRows Then <BR>While myreader.Read()=20
<BR>Me.ComboBox1.Items.Add(myreader.GetString(0)) <BR>End While <BR>End =
If=20
<BR>mycon.Close() <BR><BR>End Sub <BR>----=B2=E9=D1=AF <BR>Private Sub=20
ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As =

System.EventArgs) Handles ComboBox1.SelectedIndexChanged <BR><BR>'If=20
Me.ComboBox1.Text =3D "" Then <BR>' Me.ComboBox1.Enabled =3D True <BR>'=20
Me.TextBox1.Enabled =3D True <BR>' Me.TextBox2.Enabled =3D True =
<BR>'Else <BR>'=20
Me.ComboBox1.Enabled =3D False <BR>' Me.TextBox1.Enabled =3D False <BR>' =

Me.TextBox2.Enabled =3D False <BR>'End If <BR>Dim mycmd1 As New =
SqlCommand=20
<BR>mycmd1.Connection =3D mycon <BR>mycmd1.CommandType =3D =
CommandType.Text=20
<BR>mycmd1.CommandText =3D "select * from student where name=3D'" &amp;=20
Trim(Me.ComboBox1.SelectedItem) &amp; "'" <BR>'mycmd1.CommandText =3D =
"select *=20
from student where name=3D@name" <BR>'Dim name As SqlParameter =3D=20
mycmd1.Parameters.Add("@dbname", SqlDbType.Char, 10) <BR>'name.Direction =
=3D=20
ParameterDirection.Input <BR>'name.Value =3D Me.ComboBox1.SelectedItem=20
<BR>mycon.Open() <BR>Dim myreader1 As SqlDataReader <BR>myreader1 =3D=20
mycmd1.ExecuteReader <BR>If myreader1.HasRows And myreader1.Read Then=20
<BR>Me.TextBox1.Text =3D myreader1(1).ToString <BR>Me.TextBox2.Text =3D=20
myreader1(2).ToString <BR>Me.TextBox3.Text =3D myreader1(3).ToString=20
<BR>Me.TextBox4.Text =3D myreader1(4).ToString <BR>End If =
<BR>'1=A1=A2=B5=B1=D5=D5=C6=AC=D7=D6=B6=CE=CE=AA=BF=D5=CA=B1=A3=AC=D6=B8=B6=
=A8=D2=BB=D5=C5=C4=AC=C8=CF=D5=D5=C6=AC=20
<BR>If myreader1.IsDBNull(5) Then <BR>PictureBox1.Image =3D=20
Image.FromFile("D:\image\hua4.jpg") <BR>Else =
<BR>'2=A1=A2=D5=D5=C6=AC=D7=D6=B6=CE=B2=BB=CE=AA=BF=D5 =
<BR>'1=A3=A9=B6=A8=D2=E5=D2=BB=B8=F6=D7=D6=BD=DA=CA=FD=D7=E9=20
<BR>Dim mybyte(myreader1.GetBytes(5, 0, Nothing, 0, Integer.MaxValue) - =
1) As=20
Byte=20
'=BF=C9=D3=C3=D7=D6=BD=DA=CA=FD=BC=F51=A3=AC5=CE=AA=B4=D30=BF=AA=CA=BC=B5=
=C4=D0=F2=C1=D0=BA=C5=A3=AC0=CE=AA=B4=D30=BF=AA=CA=BC=B6=C1=C8=A1=A3=ACno=
thing=CE=AA=D7=D6=BD=DA=C1=F7=C8=EB=B5=C4=BB=BA=B3=E5=C7=F8=A3=AC0=CE=AA=B4=
=D30=BF=AA=CA=BC=B6=C1=C8=A1=BB=BA=B3=E5=C7=F8=B5=C4=CB=F7=D2=FD=A3=ACint=
erger.maxvalue=CE=AA=BB=BA=B3=E5=C7=F8=D6=D0=B5=C4=D7=EE=B4=F3=B3=A4=B6=C8=
=20
<BR>'2)=BD=AB=CA=FD=BE=DD=BF=E2=D6=D0=B5=C4=D5=D5=C6=AC=D7=D6=B6=CE=B7=C5=
=B5=BD=D7=D6=BD=DA=CA=FD=D7=E9=D6=D0 <BR>myreader1.GetBytes(5, 0, =
mybyte, 0, mybyte.Length)=20
<BR>'3)=B4=B4=BD=A8=D2=BB=B8=F6=C4=DA=B4=E6=C1=F7 <BR>Dim mymem As New =
MemoryStream(mybyte) <BR>'4=A3=A9=B0=F3=B6=A8=BF=D8=BC=FE=20
<BR>PictureBox1.Image =3D Image.FromStream(mymem) <BR>End If =
<BR>mycon.Close()=20
<BR><BR>End Sub <BR>----=D4=F6=BC=D3 <BR>Private Sub Button1_Click(ByVal =
sender As=20
System.Object, ByVal e As System.EventArgs) Handles Button1.Click=20
<BR>'=CA=B9=D3=C3=B5=DA=C8=FD=B8=F6=B9=B9=D4=EC=BA=AF=CA=FD=C0=B4=BD=A8=C1=
=A2SQLCOMMAND=B6=D4=CF=F3 <BR>Dim insertcmd As New SqlCommand <BR>With=20
insertcmd <BR>.Connection =3D mycon <BR>.CommandType =3D =
CommandType.Text=20
<BR>.CommandText =3D "insert into=20
student(name,class,grade,chinese,english,picture)=20
values(@name,@class,@grade,@chinese,@english,@picture)" <BR>Dim name As=20
SqlParameter =3D .Parameters.Add("@name", SqlDbType.Char, 10) =
<BR>name.Value =3D=20
Trim(Me.ComboBox1.Text) <BR>Dim clas As SqlParameter =3D =
.Parameters.Add("@class",=20
SqlDbType.Char, 2) <BR>clas.Value =3D Trim(Me.TextBox1.Text) <BR>Dim =
grade As=20
SqlParameter =3D .Parameters.Add("@grade", SqlDbType.Char, 1) =
<BR>grade.Value =3D=20
Trim(Me.TextBox2.Text) <BR>Dim chinese As SqlParameter =3D=20
.Parameters.Add("@chinese", SqlDbType.Float, 8) <BR>chinese.Value =3D=20
Me.TextBox3.Text <BR>Dim english As SqlParameter =3D =
.Parameters.Add("@english",=20
SqlDbType.Float, 8) <BR>english.Value =3D Me.TextBox4.Text =
<BR>'1=A1=A2=BD=AB=CE=C4=BC=FE=D7=AA=BB=BB=B3=C9=CE=AA=CE=C4=BC=FE=C1=F7=D0=
=CE=CA=BD=20
<BR>Dim fs As FileStream =3D New FileStream(filepath, FileMode.Open,=20
FileAccess.Read) =
<BR>'2=A1=A2=B6=C1=C8=A1=B6=FE=BD=F8=D6=C6=CE=C4=BC=FE=C1=F7 <BR>Dim br =
As BinaryReader =3D New=20
BinaryReader(fs) =
<BR>'3=A1=A2=B6=A8=D2=E5=D2=BB=B8=F6=D7=D6=BD=DA=CA=FD=D7=E9=A3=AC=BD=AB=B6=
=FE=BD=F8=D6=C6=B5=C4=CE=C4=BC=FE=B8=B3=D6=B5=B5=BD=D7=D6=BD=DA=CA=FD=D7=E9=
=D6=D0 <BR>Dim pict() As Byte =3D=20
br.ReadBytes(fs.Length) =
<BR>'=B9=D8=B1=D5=CE=C4=BC=FE=C1=F7=BA=CD=B6=FE=BD=F8=D6=C6=B6=C1=C8=A1=C6=
=F7 <BR>fs.Close() <BR>br.Close()=20
<BR>'4=A1=A2=BD=AB=D7=D6=BD=DA=CA=FD=D7=E9=CC=ED=BC=D3=B5=BD=D2=D4=B2=CE=CA=
=FD=BC=AF=BA=CF=D6=D0=C8=A5 <BR>Dim picture As SqlParameter =3D=20
.Parameters.Add("@picture", SqlDbType.Image, pict.Length) =
<BR>picture.Value =3D=20
pict <BR><BR>End With <BR>'=B4=F2=BF=AA=C1=AC=BD=D3 <BR>mycon.Open() =
<BR>'=D6=B4=D0=D0=CA=FD=BE=DD=C3=FC=C1=EE <BR>Try=20
<BR>insertcmd.ExecuteNonQuery() =
<BR>MessageBox.Show("=B9=A7=CF=B2=C4=FA=A3=AC=CC=ED=BC=D3=B3=C9=B9=A6=A3=A1=
") <BR>Catch ex As=20
Exception <BR>MessageBox.Show(ex.ToString(), "=C7=EB=D7=A2=D2=E2", =
MessageBoxButtons.OK,=20
MessageBoxIcon.Stop) <BR>Finally <BR>'=B9=D8=B1=D5=C1=AC=BD=D3 =
<BR>mycon.Close() <BR>End Try <BR>End=20
Sub <BR>---=C9=BE=B3=FD <BR>Private Sub Button2_Click(ByVal sender As =
System.Object, ByVal=20
e As System.EventArgs) Handles Button2.Click <BR>Dim deletecmd As New =
SqlCommand=20
<BR>With deletecmd <BR>.Connection =3D mycon <BR>.CommandType =3D =
CommandType.Text=20
<BR>.CommandText =3D "delete student where name=3D@name" <BR>Dim name As =

SqlParameter =3D .Parameters.Add("@name", SqlDbType.Char, 10) =
<BR>name.Value =3D=20
Trim(Me.ComboBox1.Text) <BR>End With <BR>mycon.Open() <BR>Try=20
<BR>deletecmd.ExecuteNonQuery() =
<BR>MessageBox.Show("=B9=A7=CF=B2=C4=FA=A3=AC=C9=BE=B3=FD=B3=C9=B9=A6=A3=A1=
")=20
<BR>Me.ComboBox1.Items.Remove(Me.ComboBox1.SelectedItem)=20
<BR>Me.ComboBox1.Enabled =3D True <BR>Me.TextBox1.Enabled =3D True=20
<BR>Me.TextBox2.Enabled =3D True <BR>Catch ex As Exception=20
<BR>MessageBox.Show(ex.ToString(), "=C7=EB=D7=A2=D2=E2", =
MessageBoxButtons.OK,=20
MessageBoxIcon.Stop) <BR>Finally <BR>'=B9=D8=B1=D5=C1=AC=BD=D3 =
<BR>mycon.Close() <BR>End Try=20
<BR><BR>End Sub <BR>-----=D0=DE=B8=C4 <BR>Private Sub =
Button3_Click(ByVal sender As=20
System.Object, ByVal e As System.EventArgs) Handles Button3.Click=20
<BR>mycon.Open() <BR>Dim updatecmd As New SqlCommand <BR>With updatecmd=20
<BR>.Connection =3D mycon <BR>.CommandType =3D CommandType.Text =
<BR>.CommandText =3D=20
"update student set =
chinese=3D@chinese,english=3D@english,picture=3D@picture where=20
name=3D@name" <BR>Dim name As SqlParameter =3D .Parameters.Add("@name",=20
SqlDbType.Char, 10) <BR>name.Value =3D Trim(Me.ComboBox1.Text) <BR>Dim =
chinese As=20
SqlParameter =3D .Parameters.Add("@chinese", SqlDbType.Float, 8) =
<BR>chinese.Value=20
=3D Me.TextBox3.Text <BR>Dim english As SqlParameter =3D =
.Parameters.Add("@english",=20
SqlDbType.Float, 8) <BR>english.Value =3D Me.TextBox4.Text =
<BR>'1=A1=A2=BD=AB=CE=C4=BC=FE=D7=AA=BB=BB=B3=C9=CE=AA=CE=C4=BC=FE=C1=F7=D0=
=CE=CA=BD=20
<BR>Dim fs As FileStream =3D New FileStream(filepath, FileMode.Open,=20
FileAccess.Read) =
<BR>'2=A1=A2=B6=C1=C8=A1=B6=FE=BD=F8=D6=C6=CE=C4=BC=FE=C1=F7 <BR>Dim br =
As BinaryReader =3D New=20
BinaryReader(fs) =
<BR>'3=A1=A2=B6=A8=D2=E5=D2=BB=B8=F6=D7=D6=BD=DA=CA=FD=D7=E9=A3=AC=BD=AB=B6=
=FE=BD=F8=D6=C6=B5=C4=CE=C4=BC=FE=B8=B3=D6=B5=B5=BD=D7=D6=BD=DA=CA=FD=D7=E9=
=D6=D0 <BR>Dim pict() As Byte =3D=20
br.ReadBytes(fs.Length) =
<BR>'=B9=D8=B1=D5=CE=C4=BC=FE=C1=F7=BA=CD=B6=FE=BD=F8=D6=C6=B6=C1=C8=A1=C6=
=F7 <BR>fs.Close() <BR>br.Close()=20