/// <summary>
/// 数据库操作类
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
public DBHelper(string connectionString)
{
if (!string.IsNullOrWhiteSpace(connectionString))
{
_connectionString = connectionString;
}
else
{
_connectionString = DbConnections.GetDbConnectionString();
}
}
/// <summary>
/// 创建DBHelper实例
/// </summary>
/// <param name="connectionString">指定连接字符串</param>
/// <param name="dataBaseType">指定数据库类型</param>
/// <returns></returns>
public static IDBHelper GetDBHelper(string connectionString = null, DataBaseType dataBaseType = DataBaseType.Auto)
{
IDBHelper helper = null;
if (dataBaseType == DataBaseType.Auto)
{
dataBaseType = DbConnections.DbType;
}
Monitor.Enter(_dbHelperCache);
if (_dbHelperCache.ContainsKey(dataBaseType))
{
Monitor.Exit(_dbHelperCache);
return(_dbHelperCache[dataBaseType]);
}
if (connectionString == null)
{
connectionString = DbConnections.GetDbConnectionString(dataBaseType);
}
switch (dataBaseType)
{
case DataBaseType.SqlServer:
helper = ReflectHelper.GetInstance("SQLHelper.dll", "SQLHelper.SQLHelper", connectionString) as IDBHelper;
break;
case DataBaseType.MySql:
helper = ReflectHelper.GetInstance("MySQLHelper.dll", "MySQLHelper.MySQLHelper", connectionString) as IDBHelper;
break;
case DataBaseType.Oracle:
helper = ReflectHelper.GetInstance("OracleHelper.dll", "OracleHelper.OracleHelper", connectionString) as IDBHelper;
break;
case DataBaseType.Sqlite:
helper = ReflectHelper.GetInstance("SQLiteHelper.dll", "SQLiteHelper.SQLiteHelper", connectionString) as IDBHelper;
break;
default:
Monitor.Exit(_dbHelperCache);
throw new Exception("未知数据库类型");
}
if (helper != null)
{
_dbHelperCache.Add(dataBaseType, helper);
}
Monitor.Exit(_dbHelperCache);
return(helper);
}