C#操作SQLite的辅助类

SQLite这个精巧的小数据库，无需安装软件，只需要一个System.Data.SQLite.DLL文件即可操作SQLite数据库。SQLite是 一个开源数据库，现在已变得越来越流行，它的体积很小，被广泛应用于各种不同类型的应用中。

 
using System;
  
using System.Collections.Generic;
  
using System.Text;
  
using System.Web;
  
using System.Configuration;
  
using System.Data;
  
using System.Data.SQLite;
  
  
  
namespace DAL
  
{
  
    public class Sqlite
  
    {
  
        /// <summary>
  
        /// 获得连接对象
  
        /// </summary>
  
        /// <returns></returns>
  
        public static SQLiteConnection GetSQLiteConnection()
  
        {
  
            return new SQLiteConnection("Data Source=" + System.Web.HttpContext.Current.Server.MapPath(System.Configuration.ConfigurationManager.AppSettings["db"].ToString()));
  
        }
  
  
  
        private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, string cmdText, params object[] p)
  
        {
  
  
  
            if (conn.State != ConnectionState.Open)
  
                conn.Open();
  
            cmd.Parameters.Clear();
  
            cmd.Connection = conn;
  
            cmd.CommandText = cmdText;
  
  
  
            cmd.CommandType = CommandType.Text;
  
            cmd.CommandTimeout = 30;
  
  
  
            if (p != null)
  
            {
  
                foreach (object parm in p)
  
                    cmd.Parameters.AddWithValue(string.Empty, parm);
  
                //for (int i = 0; i < p.Length; i++)
  
                //    cmd.Parameters[i].Value = p[i];
  
            }
  
        }
  
  
  
        public static DataSet ExecuteDataset(string cmdText, params object[] p)
  
        {
  
            DataSet ds = new DataSet();
  
            SQLiteCommand command = new SQLiteCommand();
  
            using (SQLiteConnection connection = GetSQLiteConnection())
  
            {
  
                PrepareCommand(command, connection, cmdText, p);
  
                SQLiteDataAdapter da = new SQLiteDataAdapter(command);
  
                da.Fill(ds);
  
            }
  
  
  
            return ds;
  
        }
  
  
  
        public static DataRow ExecuteDataRow(string cmdText, params object[] p)
  
        {
  
            DataSet ds = ExecuteDataset(cmdText, p);
  
            if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
  
                return ds.Tables[0].Rows[0];
  
            return null;
  
        }
  
  
  
        /// <summary>
  
        /// 返回受影响的行数
  
        /// </summary>
  
        /// <param name="cmdText">a</param>
  
        /// <param name="commandParameters">传入的参数</param>
  
        /// <returns></returns>
  
        public static int ExecuteNonQuery(string cmdText, params object[] p)
  
        {
  
            SQLiteCommand command = new SQLiteCommand();
  
  
  
            using (SQLiteConnection connection = GetSQLiteConnection())
  
            {
  
                PrepareCommand(command, connection, cmdText, p);
  
                return command.ExecuteNonQuery();
  
            }
  
        }
  
  
  
        /// <summary>
  
        /// 返回SqlDataReader对象
  
        /// </summary>
  
        /// <param name="cmdText"></param>
  
        /// <param name="commandParameters">传入的参数</param>
  
        /// <returns></returns>
  
        public static SQLiteDataReader ExecuteReader(string cmdText, params object[] p)
  
        {
  
            SQLiteCommand command = new SQLiteCommand();
  
            SQLiteConnection connection = GetSQLiteConnection();
  
            try
  
            {
  
                PrepareCommand(command, connection, cmdText, p);
  
                SQLiteDataReader reader = command.ExecuteReader(CommandBehavior.CloseConnection);
  
                return reader;
  
            }
  
            catch
  
            {
  
                connection.Close();
  
                throw;
  
            }
  
        }
  
  
  
        /// <summary>
  
        /// 返回结果集中的第一行第一列，忽略其他行或列
  
        /// </summary>
  
        /// <param name="cmdText"></param>
  
        /// <param name="commandParameters">传入的参数</param>
  
        /// <returns></returns>
  
        public static object ExecuteScalar(string cmdText, params object[] p)
  
        {
  
            SQLiteCommand cmd = new SQLiteCommand();
  
  
  
            using (SQLiteConnection connection = GetSQLiteConnection())
  
            {
  
                PrepareCommand(cmd, connection, cmdText, p);
  
                return cmd.ExecuteScalar();
  
            }
  
        }
  
  
  
        /// <summary>
  
        /// 分页
  
        /// </summary>
  
        /// <param name="recordCount"></param>
  
        /// <param name="pageIndex"></param>
  
        /// <param name="pageSize"></param>
  
        /// <param name="cmdText"></param>
  
        /// <param name="countText"></param>
  
        /// <param name="p"></param>
  
        /// <returns></returns>
  
        public static DataSet ExecutePager(ref int recordCount, int pageIndex, int pageSize, string cmdText, string countText, params object[] p)
  
        {
  
            if (recordCount < 0)
  
                recordCount = int.Parse(ExecuteScalar(countText, p).ToString());
  
  
  
            DataSet ds = new DataSet();
  
  
  
            SQLiteCommand command = new SQLiteCommand();
  
            using (SQLiteConnection connection = GetSQLiteConnection())
  
            {
  
                PrepareCommand(command, connection, cmdText, p);
  
                SQLiteDataAdapter da = new SQLiteDataAdapter(command);
  
                da.Fill(ds, (pageIndex - 1) * pageSize, pageSize, "result");
  
            }
  
            return ds;
  
        }
  
    }
  
}
 

标签： 数据库

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