AccessHelper

 

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;

    /// <summary>
    /// AccessHelper 的摘要说明
    /// </summary>
    public class AccessHelper
    {
        protected OleDbConnection conn = new OleDbConnection();
        protected OleDbCommand comm = new OleDbCommand();
        protected string connStr;
        public AccessHelper()
        {
            //
            //
        }
        public AccessHelper(string dbpath)
        {
            conn.ConnectionString = connStr = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + dbpath + ";Jet OLEDB:Database PassWord=";
        }

        /// <summary>
        /// 打开数据库
        /// </summary>
        private void openConnection()
        {
            if (conn.State == ConnectionState.Closed)
            {
                //if (conn.ConnectionString.IsNullOrEmpty()) {
                //    conn.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + AppDomain.CurrentDomain.BaseDirectory + ConfigurationManager.AppSettings["myconn"].ToString() + ";Jet OLEDB:Database PassWord=sa";
                //}
                conn.ConnectionString = connStr;
                comm.Connection = conn;
                try
                {
                    conn.Open();
                }
                catch (Exception e) { throw new Exception(e.Message); }
            }

        }
        /// <summary>
        /// 关闭数据库
        /// </summary>
        private void closeConnection()
        {
            if (conn.State == ConnectionState.Open)
            {
                conn.Close();
                conn.Dispose();
                comm.Dispose();
            }
        }
        /// <summary>
        /// 执行sql语句
        /// </summary>
        /// <param name="sqlstr"></param>
        public void excuteSql(string sqlstr)
        {
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sqlstr;
                comm.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally { closeConnection(); }
        }
        /// <summary>
        /// 返回指定sql语句的OleDbDataReader对象，使用时请注意关闭这个对象。
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <returns></returns>
        public OleDbDataReader dataReader(string sqlstr)
        {
            OleDbDataReader dr = null;
            try
            {
                openConnection();
                comm.CommandText = sqlstr;
                comm.CommandType = CommandType.Text;

                dr = comm.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch
            {
                try
                {
                    dr.Close();
                    closeConnection();
                }
                catch { }
            }
            return dr;
        }
        /// <summary>
        /// 返回指定sql语句的OleDbDataReader对象,使用时请注意关闭
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <param name="dr"></param>
        public void dataReader(string sqlstr, ref OleDbDataReader dr)
        {
            try
            {
                openConnection();
                comm.CommandText = sqlstr;
                comm.CommandType = CommandType.Text;
                dr = comm.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch
            {
                try
                {
                    if (dr != null && !dr.IsClosed)
                        dr.Close();
                }
                catch
                {
                }
                finally
                {
                    closeConnection();
                }
            }
        }
        /// <summary>
        /// 返回指定sql语句的dataset
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <returns></returns>
        public DataSet dataSet(string sqlstr)
        {
            DataSet ds = new DataSet();
            OleDbDataAdapter da = new OleDbDataAdapter();
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sqlstr;
                da.SelectCommand = comm;
                da.Fill(ds);

            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                closeConnection();
            }
            return ds;
        }
        /// <summary>
        /// 返回指定sql语句的dataset
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <param name="ds"></param>
        public void dataSet(string sqlstr, ref DataSet ds)
        {
            OleDbDataAdapter da = new OleDbDataAdapter();
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sqlstr;
                da.SelectCommand = comm;
                da.Fill(ds);
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                closeConnection();
            }
        }
        /// <summary>
        /// 返回指定sql语句的datatable
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <returns></returns>
        public DataTable dataTable(string sqlstr)
        {
            DataTable dt = new DataTable();
            OleDbDataAdapter da = new OleDbDataAdapter();
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sqlstr;
                da.SelectCommand = comm;
                da.Fill(dt);
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                closeConnection();
            }
            return dt;
        }
        /// <summary>
        /// 返回指定sql语句的datatable
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <param name="dt"></param>
        public void dataTable(string sqlstr, ref DataTable dt)
        {
            OleDbDataAdapter da = new OleDbDataAdapter();
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sqlstr;
                da.SelectCommand = comm;
                da.Fill(dt);
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                closeConnection();
            }
        }
        /// <summary>
        /// 返回指定sql语句的dataview
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <returns></returns>
        public DataView dataView(string sqlstr)
        {
            OleDbDataAdapter da = new OleDbDataAdapter();
            DataView dv = new DataView();
            DataSet ds = new DataSet();
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sqlstr;
                da.SelectCommand = comm;
                da.Fill(ds);
                dv = ds.Tables[0].DefaultView;
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                closeConnection();
            }
            return dv;
        }
        /// <summary>
        /// 带参数的sql
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="parameters"></param>
        public void excuteSql(string sql, OleDbParameter[] parameters)
        {
            try
            {
                openConnection();
                comm.CommandType = CommandType.Text;
                comm.CommandText = sql;
                comm.Parameters.AddRange(parameters);
                comm.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally { closeConnection(); }
        }
    }

　　

using ADOX;
using System;
using System.Collections.Generic;
using System.Data.OleDb;
using System.Linq;
using System.Text;

  public class AccessUtils {
        //创建数据库
        public static bool CreateAccessDB(string fileName) {
            string conn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileName;
            ADOX.Catalog catalog = new Catalog();
            try {
                catalog.Create(conn);
                return true;
            } catch (Exception ex) {
                ErrorLog.Write("创库出错", ex);
            }
            return false;
        }

        public static bool CreateAccdb(string fileName) {
            return false;
        }
        /// <summary>
        /// 创建表
        /// </summary>
        /// <param name="DBName"></param>
        /// <param name="tableName"></param>
        /// <returns></returns>
        public static bool CreateTable(string DBName, string tableName, List<string> colums) {
            string conn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + DBName + ";Jet OLEDB:Database PassWord=";
            try {
                ADOX.Catalog cat = new ADOX.Catalog();
                OleDbConnection cn = new OleDbConnection();
                cn.ConnectionString = conn;
                cn.Open();
                cat.ActiveConnection = cn;
                //表
                ADOX.Table tbl = new ADOX.Table();
                tbl.ParentCatalog = cat;
                tbl.Name = tableName;//设置表名
                for (int i = 0; i < colums.Count; i++) {//添加字段?(默认第一个字段做主键,自动增长
                    var item=colums[i];
                    ADOX.Column column = new ADOX.Column();
                    column.Name = item;
                }
            } catch (Exception ex) {
                ErrorLog.Write("创表出错", ex);
            }
            return false;
        }

        /// <summary>
        /// 创建表
        /// </summary>
        /// <param name="DBName"></param>
        /// <param name="tableName"></param>
        /// <returns></returns>
        public static bool CreateTable(string DBName, string createSql) {
            string conn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + DBName + ";Jet OLEDB:Database PassWord=";
              OleDbConnection cn = new OleDbConnection();
            OleDbCommand cmd = new OleDbCommand();
            try {
                cn.ConnectionString = conn;
                cn.Open();
                cmd.CommandText = createSql;
                cmd.Connection = cn;
                cmd.ExecuteNonQuery();
                return true;
            } catch (Exception ex) {
                ErrorLog.Write("创表出错", ex);
            }finally{
                cmd.Dispose();
                cn.Close();
            }
            return false;
        }
    }