请问如何使用MySqlClient实现如下功能:
已知连接参数
Public sql As String = "server=192.168.2.97;user id=root;password=root;persistsecurityinfo=True;port=3306;database=school"
表名 children
1) 读取 Index=1 行 age 值
2) 写入一行新数据“Index=7;name=ght;age=12;sex=girl”
3) 将 Index=4 行的 age 数据修改为12
4) 查询表中 age=12 的数据行有多少
5) 将 Index=4 行数据从数据库中删除
现有资料都是通过ADODC连接,但是项目要求使用MySqlClient来做
现有已经实现的功能1,2,的源码如下(非此题代码,是我的项目源码),但是其它的不会写了
'数据库相关
Public sql As String = "server=192.168.2.97;user id=root;password=nbjgtyndatabase;persistsecurityinfo=True;port=3307;database=nbjgtyn"
Public mcn As MySqlConnection = New MySql.Data.MySqlClient.MySqlConnection(sql)
Public sqlstr As String = "select * from Zhi_Liu_Ce_Liang where Datatime = '" & DateTime.Now & "'"
Public mda As MySqlDataAdapter
Public dt As DataTable
Public Entry As String = "aaaa" '数据库中存储本机设置的条目查询字
Public astr As String = "select * from Config where Name = '" & Entry & "'"
Public mcmd As MySqlCommand
Public mdr As MySqlDataReader
1)
mcn.Open()
mcmd = New MySqlCommand(astr, mcn)
mdr = mcmd.ExecuteReader
mdr.Read()
Local_Port = mdr.Item("Port")
KeyWord = mdr.Item("Keyword")
mcn.Close()
2)
mda = New MySqlDataAdapter(sqlstr, mcn)
dt = New DataTable
mda.Fill(dt)
Dim dr As DataRow = dt.NewRow()
dr.Item("Number") = sender.Number
dr.Item("Datatime") = DateTime.Now
dr.Item("Current") = sender.Current
dr.Item("Voltage") = sender.Voltage
dr.Item("Power") = sender.Power
dt.Rows.Add(dr)
Dim cb As MySqlCommandBuilder = New MySqlCommandBuilder(mda)
mda.Update(dt)