using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
www.2cto.com
using System.Data;
using System.Data.SQLite;
using System.Data.Common;
namespace JonseTest
{
public abstract class SqlLiteHelper
{
public static string ConnSqlLiteDbPath = string.Empty;
public static string ConnString
{
get
{
return string.Format(@"Data Source={0}", ConnSqlLiteDbPath);
}
}
// 取datatable
public static DataTable GetDataTable(out string sError,string sSQL)
{
DataTable dt = null;
sError = string.Empty;
try
{
SQLiteConnection conn = new SQLiteConnection(ConnString);
conn.Open();
SQLiteCommand cmd = new SQLiteCommand();
cmd.CommandText = sSQL;
cmd.Connection = conn;
SQLiteDataAdapter dao = new SQLiteDataAdapter(cmd);
dt = new DataTable();
dao.Fill(dt);
}
catch (Exception ex)
{
sError = ex.Message;
}
return dt;
}
// 取dataset
public static DataSet GetDataSet(out string sError, string sSQL)
{
DataSet ds = null;
sError = string.Empty;
try
{
SQLiteConnection conn = new SQLiteConnection(ConnString);
conn.Open();
SQLiteCommand cmd = new SQLiteCommand();
cmd.CommandText = sSQL;
cmd.Connection = conn;
SQLiteDataAdapter dao = new SQLiteDataAdapter(cmd);
ds = new DataSet();
dao.Fill(ds);
}
catch (Exception ex)
{
sError = ex.Message;
}
return ds;
}
// 取某個單一的元素
public static object GetSingle(out string sError, string sSQL)
{
DataTable dt = GetDataTable(out sError, sSQL);
if (dt != null && dt.Rows.Count > 0)
{
return dt.Rows[0][0];
}
return null;
}
// 取最大的ID
public static Int32 GetMaxID(out string sError, string sKeyField,string sTableName)
{
DataTable dt = GetDataTable(out sError, "select ifnull(max([" + sKeyField + "]),0) as MaxID from [" + sTableName + "]");
if (dt != null && dt.Rows.Count > 0)
{
return Convert.ToInt32(dt.Rows[0][0].ToString());
}
return 0;
}
// 執行insert,update,delete 動作，也可以使用事務
public static bool UpdateData(out string sError, string sSQL,bool bUseTransaction=false)
{
int iResult = 0;
sError = string.Empty;
if (!bUseTransaction)
{
try
{
SQLiteConnection conn = new SQLiteConnection(ConnString);
conn.Open();
SQLiteCommand comm = new SQLiteCommand(conn);
comm.CommandText = sSQL;
iResult = comm.ExecuteNonQuery();
}
catch (Exception ex)
{
sError = ex.Message;
iResult = -1;
}
}
else // 使用事務
{
DbTransaction trans =null;
try
{
SQLiteConnection conn = new SQLiteConnection(ConnString);
conn.Open();
trans = conn.BeginTransaction();
SQLiteCommand comm = new SQLiteCommand(conn);
comm.CommandText = sSQL;
iResult = comm.ExecuteNonQuery();
trans.Commit();
}
catch (Exception ex)
{
sError = ex.Message;
iResult = -1;
trans.Rollback();
}
}
return iResult >0;
}
}
}
關於具體如何調用SqlLiteHelper ，請參考我的博文：
C# 使用sqlite 輕量級數據庫
網址：http://www.BkJia.com/kf/201111/111179.html
