using System; using System.Collections.Generic; using System.Text; using System.Data;// using System.Data.OleDb;// using System.Drawing;// namespace EColor { class ControlDBS { //定义链接字符串 private OleDbConnection con; /// <summary> /// 构造函数 /// </summary> /// <param name="path">数据库路径</param> public ControlDBS(string path) { con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path); } /// <summary> /// 获取sql查询数据到数据表 /// </summary> /// <param name="SQL">SQL语句</param> /// <returns>数据表</returns> public DataTable GetDataTable(string SQL) { OleDbDataAdapter adp = new OleDbDataAdapter(SQL, con); try { con.Open(); DataTable dt = new DataTable(); adp.Fill(dt); return dt; } catch { return null; } finally { con.Close(); } } /// <summary> /// 获取数据到数据集 /// </summary> /// <param name="SQL">SQL语句</param> /// <returns>数据集</returns> public DataSet GetDataSet(string SQL) { OleDbDataAdapter adp = new OleDbDataAdapter(SQL, con); try { con.Open(); DataSet ds = new DataSet(); adp.Fill(ds); return ds; } catch { return null; } finally { con.Close(); } } /// <summary> /// 获取数据到DataReader /// </summary> /// <param name="SQL">SQL语句</param> /// <returns>DataReader</returns> public OleDbDataReader GetDataReader(string SQL) { OleDbCommand cmd = new OleDbCommand(SQL, con); try { con.Open(); OleDbDataReader dr = cmd.ExecuteReader(); return dr; } catch { return null; } } /// <summary> /// 返回sql查询的第一行第一列 /// </summary> /// <param name="SQL">SQL语句</param> /// <returns>第一行第一列的字符串</returns> public string GetFirstValue(string SQL) { OleDbCommand cmd = new OleDbCommand(SQL, con); try { con.Open(); string strchar = cmd.ExecuteScalar().ToString(); return strchar; } catch { return null; } finally { con.Close(); } } /// <summary> /// 执行SQL语句 /// </summary> /// <param name="SQL">SQL语句</param> public void RunSqlCmd(string SQL) { OleDbCommand cmd = new OleDbCommand(SQL, con); try { con.Open(); cmd.ExecuteNonQuery(); } catch { } finally { con.Close(); } } } }
时间: 2024-10-12 02:37:18