//如果con对象为空则创建
if (con == null)
{
con = new OleDbConnection(conStr)
}
//如果con的状态不为打开状态，则将其Open
if (con.State != ConnectionState.Open)
{
con.Open()
}
建议这种问题先百度或google一下
我写的关于accsee的增删改查，希望对你有帮助using System
using System.Collections.Generic
using System.ComponentModel
using System.Data
using System.Drawing
using System.Text
using System.Windows.Forms
using System.Data.OleDb
using System.Configuration
using System.IO//log需要
namespace AddressList
{
public partial class FrmAccessUse : Form
{
public FrmAccessUse()
{
InitializeComponent()
}
//access 不支持多条语句一起执行，所以不可以使用焦点值改变，生产sql语句的方法。
#region 调用access标准方法
//using System.Data.OleDb
//using System.Data
//连接字符串：String connectionString = "Provider=Microsoft.Jet.OLEDB.4.0Data Source=product.mdb"
//建立连接：OleDbConnection connection = new OleDbConnection(connectionString)
//使用OleDbCommand类来执行Sql语句：
//OleDbCommand cmd = new OleDbCommand(sql, connection)
//connection.Open()
//cmd.ExecuteNonQuery()
#endregion
#region 连接字符串
//string strcon = @"Provider=Microsoft.Jet.OLEDB.4.0Data Source=D:\access数据库 *** 作\addressList.mdb" //方法1，绝对路径
#region 全部保存2--优化的多行保存语句用的全局数组。
string strUpdate = ""//全局变量，修改保存语句
String[] szzhujian
String[] szSQL
#endregion
#endregion
#region 查询
private void tsbQuery_Click(object sender, EventArgs e)
{
query()
}
#endregion
#region 查询语句
private void query()
{
try
{
gridView1.Columns.Clear()
OleDbConnection connet1 = new OleDbConnection(strcon)
string sql = "select * from new1"
connet1.Open()
OleDbDataAdapter myadapter = new OleDbDataAdapter()
DataSet ds = new DataSet()
myadapter.SelectCommand = new OleDbCommand(sql, connet1)
myadapter.Fill(ds)
gridControl1.DataSource = ds.Tables[0]
connet1.Close()
gridControl1.Refresh()
#region 全部保存2--优化的多行保存语句
strUpdate = ""
szzhujian = null
szSQL = null
int j = this.gridView1.RowCount
szzhujian = new string[j]
szSQL = new string[j]
#endregion
}
catch (Exception exp)
{
throw exp
}
}
#endregion
#region 保存
private void tsbSave_Click(object sender, EventArgs e)
{
this.gridView1.FocusedRowHandle = -1 //关键语句，gridView1丢失焦点，进入值改变事件。
//Savebt()//单行保存
NewUpdate()//多行数据保存
}
#endregion
#region 保存语句
private void Savebt()
{
try
{
int[] rowCount = this.gridView1.GetSelectedRows()
string strSql = ""
foreach (int i in rowCount)
{
this.gridView1.FocusedRowHandle = -1
string strID = "", strBH = "", strMC = "", strLXID = "", strLX = "", strSM = "", strFZ = ""
strID = this.gridView1.GetRowCellValue(i, "ZMID").ToString()
strBH = this.gridView1.GetRowCellValue(i, "帐目编号").ToString()
strMC = this.gridView1.GetRowCellValue(i, "帐目名称").ToString()
strLXID = this.gridView1.GetRowCellValue(i, "帐目类型ID").ToString()
strLX = this.gridView1.GetRowCellValue(i, "帐目类型").ToString()
strSM = this.gridView1.GetRowCellValue(i, "说明").ToString()
strFZ = this.gridView1.GetRowCellValue(i, "附注").ToString()
strSql = "Update new1 set 帐目编号='" + strBH + "', 帐目名称='" + strMC + "',帐目类型ID='" + strLXID + "',帐目类型='" + strLX + "',说明='" + strSM + "',附注='" + strFZ + "' where ZMID = " + strID + ""//注意where处没有单引号
}
OleDbConnection connet1 = new OleDbConnection(strcon)
connet1.Open()
OleDbCommand cmd = new OleDbCommand(strSql, connet1)
int a = cmd.ExecuteNonQuery()
connet1.Close()
if (a >0)
{
MessageBox.Show("保存成功！")
}
query()
}
catch (Exception exp)
{
throw exp
}
}
#endregion
#region 优化的多行保存语句
private void NewUpdate()
{
try
{
if (szzhujian != null)
{
int a = 0
OleDbConnection connet1 = new OleDbConnection(strcon)
connet1.Open()
for (int i = 0i <szzhujian.Lengthi++)
{
strUpdate = szSQL[i]
if (strUpdate != null)
{
OleDbCommand cmd = new OleDbCommand(strUpdate, connet1)
a = cmd.ExecuteNonQuery()
WriteMyLog(strUpdate)
}
}
connet1.Close()
if (a >0)
{
MessageBox.Show("保存成功！")
}
query()
}
else
{
query()
}
}
catch (Exception exp)
{
throw exp
}
}
#endregion
#region 添加一条新记录
private void tsbAddNew_Click(object sender, EventArgs e)
{
addnew()
}
#endregion
#region 添加语句
private void addnew()
{
try
{
string strSql = ""
OleDbConnection connet1 = new OleDbConnection(strcon)
connet1.Open()
strSql = "insert into new1(帐目编号) values('NewValues')"
OleDbCommand cmd = new OleDbCommand(strSql, connet1)
int a = cmd.ExecuteNonQuery()
connet1.Close()
if (a >0)
{
query()
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message)
}
}
#endregion
#region 删除
private void tsbDelete_Click(object sender, EventArgs e)
{
delete()
}
#endregion
#region 删除语句
private void delete()
{
try
{
int[] rowCount = this.gridView1.GetSelectedRows()
string strSql = ""
foreach (int i in rowCount)
{
this.gridView1.FocusedRowHandle = -1
string strID = ""
strID = this.gridView1.GetRowCellValue(i, "ZMID").ToString()
strSql = "delete from new1 where ZMID=" + strID + ""//注意where处没有单引号
}
OleDbConnection connet1 = new OleDbConnection(strcon)
connet1.Open()
OleDbCommand cmd = new OleDbCommand(strSql, connet1)
int a = cmd.ExecuteNonQuery()
connet1.Close()
if (a >0)
{
MessageBox.Show("删除成功")
}
query()
}
catch (Exception ex)
{
MessageBox.Show(ex.Message)
}
}
#endregion
#region 列前序号
//事件gridView1_CustomDrawRowIndicator
private void gridView1_CustomDrawRowIndicator(object sender, DevExpress.XtraGrid.Views.Grid.RowIndicatorCustomDrawEventArgs e)
{
try
{
if (e.Info.IsRowIndicator)
{
if (e.RowHandle >= 0)
{
this.gridView1.IndicatorWidth = 40
e.Info.DisplayText = Convert.ToString(e.RowHandle + 1)
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message)
}
}
#endregion
#region 事件当焦点行值改变后
private void gridView1_CellValueChanged(object sender, DevExpress.XtraGrid.Views.Base.CellValueChangedEventArgs e)
{
#region 全部保存--优化的多行保存语句（数组）
string strID = "", strSaveSql = ""
int[] rowCount = this.gridView1.GetSelectedRows()
foreach (int i in rowCount)
{
this.gridView1.FocusedRowHandle = -1
string strBH = "", strMC = "", strLXID = "", strLX = "", strSM = "", strFZ = ""
strID = this.gridView1.GetRowCellValue(i, "ZMID").ToString()
strBH = this.gridView1.GetRowCellValue(i, "帐目编号").ToString()
strMC = this.gridView1.GetRowCellValue(i, "帐目名称").ToString()
strLXID = this.gridView1.GetRowCellValue(i, "帐目类型ID").ToString()
strLX = this.gridView1.GetRowCellValue(i, "帐目类型").ToString()
strSM = this.gridView1.GetRowCellValue(i, "说明").ToString()
strFZ = this.gridView1.GetRowCellValue(i, "附注").ToString()
strSaveSql = "Update new1 set 帐目编号='" + strBH + "', 帐目名称='" + strMC + "',帐目类型ID='" + strLXID + "',帐目类型='" + strLX + "',说明='" + strSM + "',附注='" + strFZ + "' where ZMID = " + strID + ""//注意where处没有单引号
}
if (strID != "" &&strSaveSql != "")
{
if (szzhujian[0] == null)
{
szzhujian[0] = strID
szSQL[0] = strSaveSql
}
else
{
for (int i = 0i <szzhujian.Lengthi++)
{
if (strID == szzhujian[i])
{
//return true
szSQL[i] = strSaveSql
break
}
else
{
//return false
if (i == szzhujian.Length - 1)
{
for (int k = 1k <szzhujian.Lengthk++)
{
if (szzhujian[k] == null)
{
szzhujian[k] = strID
szSQL[k] = strSaveSql
break
}
}
}
//break
}
}
}
}
#endregion
}
#endregion
#region 写log文件
public static void WriteMyLog(string ex)
{
string LOG_FOLDER = AppDomain.CurrentDomain.BaseDirectory + "Log"
try
{
//日志文件路径
string filePath = LOG_FOLDER + "\\" + DateTime.Now.ToShortDateString() + ".log"
if (!System.IO.Directory.Exists(LOG_FOLDER))//目录是否存在
{
Directory.CreateDirectory(LOG_FOLDER)
}
if (!File.Exists(filePath))//如果文件不存在
{
File.Create(filePath).Close()
}
StreamWriter sw = File.AppendText(filePath)
sw.WriteLine("-------------------------------------------------------------------------------------")
sw.WriteLine("Date:" + DateTime.Now.ToShortDateString() + " Time:" + DateTime.Now.ToShortTimeString())
sw.WriteLine(ex)
sw.Close()
}
catch (Exception exp)
{
throw exp
}
}
#endregion
}
}
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