用于sqlite数据库的SqlLiteHelper.cs 的类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
www.zzzyk.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;
}
// 取某个单一的元素
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;
}
// 执行insert,update,delete 动作，也可以使用事务
public static bool UpdateData(out string sError, string sSQL,bool bUseTran
补充：软件开发 , C# ,
