Question

SQLite数据库操作类

求SQLite数据库操作类

Answer 1

SQLite Helper类，基于.net c#的SQLite数据库操作类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。但是据说功能却非常强大。简介：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。SQLite已经是世界上布署得最广泛的SQL数据库引擎，被用在无以计数的桌面电脑应用中，还有消费电子设备中，如移动电话、掌上电脑和MP3播放器等。SQLite的源码就放在公有领域（即WikiPedia的public domain)中。开始使用:Sqliteman,windows下最好的sqlite gui客户端 sqlite,sqliteman 7.72M

SQLite Administrator 0.8.3.2┊是基于数据库引擎的管理工具┊汉化绿色特别版 sqlite 1.68M
SQLite，除了access,mysql以外的另外一个轻量级数据库
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;
}
}
}
以上是我根据SqlHelper、OledbHelper类修改而来。我已经使用过。但是不确定是否完善，因为我对SQLite接触时间还不长。欢迎大家批评指正。