//private const string SqlClient = "System.Data.SqlClient";
//private const string OleDb = "System.Data.OleDb";
//private const string OracleClient = "System.Data.OracleClient";
//private const string SQLiteClient = "System.Data.SQLite";
//private const string MySqlClient = "MySql.Data.MySqlClient";
//private const string SybaseClient = "Sybase.Data.AseClient";
//private const string PostgreClient = "System.Data.NpgSqlClient";
//private const string TxtClient = "CYQ.Data.TxtClient";
//private const string XmlClient = "CYQ.Data.XmlClient";
//private const string XHtmlClient = "CYQ.Data.XHtmlClient";
/// <summary>
/// ¼òµ¥¹¤³§£¨Factory Method£©
/// </summary>
/// <param name="dbConn"></param>
/// <returns></returns>
public static DbBase CreateDal(string connNameOrString)
{
//ABCConn
DbBase db = GetDbBaseBy(ConnObject.Create(connNameOrString));
if (db.connObject.Master.ConnName != connNameOrString && connNameOrString.EndsWith("Conn"))//ÐèÒªÇл»ÅäÖá£
{
//Conn A¿â
//BConn xxx ÕÒ²»µ½Ê±£¬ÕÒĬÈÏ¿â¡£
DbResetResult result = db.ChangeDatabase(connNameOrString.Substring(0, connNameOrString.Length - 4));
if (result == DbResetResult.Yes) // дÈ뻺´æ
{
db.connObject.SaveToCache(connNameOrString);
}
}
return(db);
}
/// <summary>
/// 简单工厂（Factory Method）
/// </summary>
/// <param name="dbConn"></param>
/// <returns></returns>
public static DbBase CreateDal(string dbConn)
{
DbBase db = GetDbBaseBy(GetConnObject(dbConn));
if (db.connObject.Master.ConfigName != dbConn && dbConn.EndsWith("Conn"))//需要切换配置。
{
DbResetResult result = db.ChangeDatabase(dbConn.Substring(0, dbConn.Length - 4));
if (result == DbResetResult.Yes) // 写入缓存
{
if (!connDicCache.ContainsKey(dbConn))
{
connDicCache.Set(dbConn, db.connObject);
}
}
}
return(db);
//ConnEntity cEntity = GetConnString(dbConn);
//DbBase db = GetDbBaseBy(cEntity.Conn, cEntity.ProviderName);
//db.connObject = cEntity;
//return db;
}
/// <summary>
/// 获取表列架构（链接错误时，抛异常）
/// </summary>
/// <param name="tableName">表名</param>
/// <param name="conn">数据库链接</param>
/// <param name="errInfo">出错时的错误信息</param>
/// <returns></returns>
public static MDataColumn GetColumns(string tableName, string conn, out string errInfo)
{
errInfo = string.Empty;
DbBase helper = DalCreate.CreateDal(conn);
DbResetResult result = helper.ChangeDatabaseWithCheck(tableName);//检测dbname.dbo.tablename的情况
switch (result)
{
case DbResetResult.No_DBNoExists:
helper.Dispose();
return(null);
case DbResetResult.No_SaveDbName:
case DbResetResult.Yes:
tableName = SqlFormat.NotKeyword(tableName); //same database no need database.tablename
break;
}
if (!helper.TestConn(AllowConnLevel.MaterBackupSlave))
{
errInfo = helper.debugInfo.ToString();
if (string.IsNullOrEmpty(errInfo))
{
errInfo = "Open database fail : " + tableName;
}
helper.Dispose();
Error.Throw(errInfo);
return(null);
}
if (!tableName.Contains(" "))//
{
tableName = GetMapTableName(conn, tableName);
}
MDataColumn mdc = TableSchema.GetColumns(tableName, ref helper);
helper.Dispose();
return(mdc);
}
