.net 连接 access 封装
using System;
using System.Web;
using System.Web.UI;
using System.Data;
using System.Data.OleDb;
using System.Text;
namespace webdb.classes
{
/// <summary>
/// DbAccess 的摘要说明。
/// </summary>
public class DbAccess:Page
{
string ConnString;
OleDbConnection conn ;
OleDbCommand cmd;
public DbAccess(string datapath)
{
ConnString = "provider=Microsoft.Jet.OleDb.4.0;Data Source="+HttpContext.Current.Request.PhysicalApplicationPath.ToString()+"\\"+datapath;
/*if(path.Length<1)
{
ConnString = "provider=Microsoft.Jet.OleDb.4.0;Data Source="+Server.MapPath("data/shuhua.mdb");
}
else
{
ConnString = "provider=Microsoft.Jet.OleDb.4.0;Data Source="+path[0].Trim();
}*/
conn = new OleDbConnection();
conn.ConnectionString=ConnString;
cmd = new OleDbCommand();
cmd.Connection=conn;
}
public DbAccess()
{
ConnString = "provider=Microsoft.Jet.OleDb.4.0;Data Source="+HttpContext.Current.Request.PhysicalApplicationPath.ToString()+"\\"+System.Configuration.ConfigurationSettings.AppSettings["datasource"];
/*if(path.Length<1)
{
ConnString = "provider=Microsoft.Jet.OleDb.4.0;Data Source="+Server.MapPath("data/shuhua.mdb");
}
else
{
ConnString = "provider=Microsoft.Jet.OleDb.4.0;Data Source="+path[0].Trim();
}*/
conn = new OleDbConnection();
conn.ConnectionString=ConnString;
cmd = new OleDbCommand();
cmd.Connection=conn;
}
/// <summary>
/// 获取数据存在DataTable中
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public DataTable GetTable(string sql)
{
cmd.CommandText=sql;
OleDbDataAdapter da = new OleDbDataAdapter();
da.SelectCommand=cmd;
//DataTable dt = new DataTable();
DataSet ds = new DataSet();
da.Fill(ds);
return ds.Tables[0];
}
/// <summary>
/// 获取一个值
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public string GetOne(string sql)
{
string obj="";
conn.Open();
cmd.CommandText=sql;
try
{
obj = Convert.ToString(cmd.ExecuteScalar());
obj = (obj==null)?(""):(obj);
}
catch(Exception ex)
{
HttpContext.Current.Response.Write("<script>alert('"+ex.Message.ToString()+"')</script>");
}
conn.Close();
return obj;
}
public DataSet GetSet(string sql)
{
cmd.CommandText=sql;
OleDbDataAdapter da = new OleDbDataAdapter();
da.SelectCommand=cmd;
//DataTable dt = new DataTable();
DataSet ds = new DataSet();
da.Fill(ds);
return ds;
}
/// <summary>
/// 事物处理
/// </summary>
/// <param name="sqls"></param>
/// <returns></returns>
public bool GetStateTran(params string[] sqls)
{
conn.Open();
OleDbTransaction tran = conn.BeginTransaction();
//tran.
cmd.Transaction=tran;
for(int i=0;i<sqls.Length;i++)
{
try
{
cmd.CommandText=sqls[i];
cmd.ExecuteNonQuery();
}
catch(Exception ex)
{
tran.Rollback();
HttpContext.Current.Response.Write(ex.Message.ToString());
return false;
}
}
tran.Commit();
conn.Close();
return true;
}
public bool GetState(string sql)
{
bool suc = false;
conn.Open();
cmd.CommandText=sql;
try
{
int count = cmd.ExecuteNonQuery();
if(count>0)
suc=true;
}
catch(Exception ex)
{
HttpContext.Current.Response.Write("<script>alert('"+ex.Message.ToString()+"')</script>");
}
conn.Close();
return suc;
}
/*public bool ReturnState(string sql)
{
string String = "provider=Microsoft.Jet.OleDb.4.0;Data Source="+Server.MapPath("data/shuhua.mdb");
OleDbConnection connR = new OleDbConnection();
connR.ConnectionString=String;
OleDbcommand cmdR = new OleDbCommand();
cmdR.Connection=connR;
bool suc = false;
connR.Open();
cmdR.CommandText=sql;
try
{
int count = cmdR.ExecuteNonQuery();
if(count>0)
suc=true;
}
catch(Exception ex)
{
HttpContext.Current.Response.Write("<script>alert('"+ex.Message.ToString()+"')</script>");
}
connR.Close();
return suc;
}*/
//分页
/*public DataTable GetPerData(string sql,int cur)
{
cmd.CommandText=sql;
OleDbDataAdapter da = new OleDbDataAdapter();
da.SelectCommand=cmd;
DataSet ds = new DataSet();
int zon = cur*8;
da.Fill(ds,zon,8,"per");
return ds.Tables["per"];
}
*/
//根据提供的页数分页
public DataTable GetPerData(string sql,int cur,int percount)
{
cmd.CommandText=sql;
OleDbDataAdapter da = new OleDbDataAdapter();
da.SelectCommand=cmd;
DataSet ds = new DataSet();
int zon = cur*percount;
da.Fill(ds,zon,percount,"per");
return ds.Tables["per"];
}
#region script处理
public void Alert(string str,string loc)
{
StringBuilder sb = new StringBuilder();
sb.Append("<script language='javascript'>alert('");
sb.Append(str);
sb.Append("');");
sb.Append(loc);
sb.Append("</script>");
HttpContext.Current.Response.Write(sb.ToString());
}
public void Alert(string str)
{
StringBuilder sb = new StringBuilder();
sb.Append("<script language='javascript'>alert('");
sb.Append(str);
sb.Append("');");
sb.Append("</script>");
HttpContext.Current.Response.Write(sb.ToString());
}
/// <summary>
/// 脚本信息
/// </summary>
/// <param name="str"></param>
public void Script(string str)
{
StringBuilder sb = new StringBuilder();
sb.Append("<script language='javascript'>");
sb.Append(str);
sb.Append("</script>");
HttpContext.Current.Response.Write(sb.ToString());
}
#endregion
#region 字符串处理
/// <summary>
/// 字符串处理
/// </summary>
/// <param name="str">old string</param>
/// <param name="len"></param>
/// <returns></returns>
public string Sub(string str,int len)
{
if(str.Length>len)
{
str = str.Substring(0,len)+"…";
}
return str;
}
#endregion
#region 数据表
/// <summary>
/// 数据表处理
/// </summary>
/// <param name="dtc">原表</param>
/// <param name="topn">前几条</param>
/// <returns></returns>
public DataTable GetTop(DataTable dtc,int topn)
{
DataTable dt = new DataTable();
#region 复制列
for(int j=0;j<dtc.Columns.Count;j++)
{
DataColumn dc = new DataColumn(dtc.Columns[j].ColumnName,typeof(string));
dt.Columns.Add(dc);
}
#endregion
#region 复制行
for(int i=0;i<topn;i++)
{
if(i<dtc.Rows.Count)
{
DataRow dr = dt.NewRow();
for(int j=0;j<dtc.Columns.Count;j++)
{
dr[j]=dtc.Rows[i][j].ToString();
}
dt.Rows.Add(dr);
}
else
{
}
}
#endregion
return dt;
}
#endregion
}
}