自己封装的ASP.NET的SQLITE数据库的操作类

代码

/*
 * 作者: 牛腩
 * 创建时间: 2010-1-20 10:43:14
 * Email: 164423073@qq.com
 * 说明: 对SQLite数据库的增删查改操作的封装类
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SQLite;
using System.Web.Configuration;
using System.Web;

namespace Niunan.Tg029.Hr.Utility
{
    public class SQLiteHelper
    {
        private SQLiteConnection conn = null;
        private SQLiteCommand cmd = null;
        private SQLiteDataReader sdr = null;

        public SQLiteHelper()
        {
           //string connStr = WebConfigurationManager.ConnectionStrings["connStr"].ToString();
            string connStr = "Data Source=" + HttpContext.Current.Server.MapPath("~/test/test.sqlite") ;
            conn = new SQLiteConnection(connStr);
        }

        /// <summary>创建Command对象
        /// 
        /// </summary>
        /// <param name="sql">SQL语句</param>
        public void CreateCommand(string sql) {
            conn.Open();
            cmd = new SQLiteCommand(sql, conn);        
        }

        /// <summary>添加参数
        /// 
        /// </summary>
        /// <param name="paramName">参数名称</param>
        /// <param name="value">值</param>
        public void AddParameter(string paramName,object value) {
            cmd.Parameters.Add(new SQLiteParameter(paramName,value));
        }

        /// <summary>执行不带参数的增删改SQL语句
        ///  
        /// </summary>
        /// <param name="cmdText">增删改SQL语句</param>
        /// <param name="ct">命令类型</param>
        /// <returns></returns>
        public bool ExecuteNonQuery()
        {
            int res;
            try
            {
                res = cmd.ExecuteNonQuery();
                if (res > 0)
                {
                    return true;
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }
            return false;
        }

        /// <summary>执行查询SQL语句
        ///  
        /// </summary>
        /// <param name="cmdText">查询SQL语句</param>
        /// <returns></returns>
        public DataTable ExecuteQuery()
        {
            DataTable dt = new DataTable();
            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
            {
                dt.Load(sdr);
            }
            return dt;
        }

        /// <summary>返回查询SQL语句查询出的结果的第一行第一列的值
        /// 
        /// </summary>
        /// <returns></returns>
        public string ExecuteScalar()
        {
            string res = "";
            try
            {
                object obj = cmd.ExecuteScalar();
                if (obj != null)
                {
                    res = obj.ToString();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }
            return res;
        }

    }
} 

使用示例看附件吧，蛮简单的一个封装，特此记录，以备不时之需！！！
附件下载：http://niunan.net/download/sqlitetest.7z