/// <summary>
/// 构造函数
/// </summary>
/// <param name="dbType">数据库类型（MYSQL/ORACLE/SQLSERVER/POSTGRESQL/DB2/SYBASE/INFORMIX）</param>
/// <param name="connStr">连接字符串</param>
public BDBHelper(string dbType, string connStr)
{
_dbType = dbType;
_connStr = connStr;
_db = GetDBOperator(dbType, connStr);
_db.Open();
}
/// <summary>
/// 构造函数
/// </summary>
/// <param name="dbType">数据库类型（MYSQL/ORACLE/SQLSERVER/POSTGRESQL/DB2/SYBASE/INFORMIX）</param>
/// <param name="ip">数据库主机IP</param>
/// <param name="port">主机端口</param>
/// <param name="userName">登录账号</param>
/// <param name="password">登录密码</param>
/// <param name="database">数据库名</param>
/// <param name="serviceName">服务名/实例名（可选，Oracle必填，为服务名）</param>
public BDBHelper(string dbType, string ip, int port, string userName, string password, string database, string serviceName = "")
{
_dbType = dbType;
_db = GetDBOperator(dbType, ip, port, userName, password, database, serviceName);
_connStr = _db.ConnString;
_db.Open();
}
/// <summary>
/// 构造函数,数据库类型及连接字符串会读取默认配置项DataBaseType、ConnString
/// </summary>
public BDBHelper()
{
_dbType = Config.BConfig.GetConfigToString(ConfigKeyForDataBaseType);
_connStr = Config.BConfig.GetConfigToString(ConfigKeyForConnString);
_db = GetDBOperator(_dbType, _connStr);
_db.Open();
}