通过泛型插入(更新)实体数据
/// <summary>
/// 通过泛型插入数据
/// </summary>
/// <typeparam name="T">类名称</typeparam>
/// <param name="obj">类对象,如果要插入空值，请使用@NULL</param>
/// <returns>插入的新记录ID</returns>
public static int Insert<T>(T obj)
{


StringBuilder strSQL = new StringBuilder();


strSQL = GetInsertSQL(obj);


// 插入到数据库中
object result = SQLPlus.ExecuteScalar(CommandType.Text, strSQL, null);


return Convert.IsDBNull(result) ? 0 : Convert.ToInt32(result);
}


/// <summary>
/// 通过泛型更新数据
/// </summary>
/// <typeparam name="T">类名称</typeparam>
/// <param name="obj">类对象,如果要更新空值，请使用@NULL</param>
/// <returns>更新结果,大于0为更新成功</returns>
public static int Update<T>(T obj)
{


StringBuilder strSQL = new StringBuilder();
strSQL = GetUpdateSQL(obj);


if (String.IsNullOrEmpty(strSQL.ToString()))
{
return 0;
}




// 更新到数据库中
object result = SQLPlus.ExecuteNonQuery(CommandType.Text, strSQL, null);


int returnValue = Convert.IsDBNull(result) ? 0 : Convert.ToInt32(result);


return returnValue;


}


/// <summary>
/// 获取实体的插入语句
/// </summary>
/// <typeparam name="T">泛型</typeparam>
/// <param name="obj">实体对象</param>
/// <returns>返回插入语句</returns>
public static StringBuilder GetInsertSQL<T>(T obj)
{


string tableKey = GetPropertyValue(obj, BaseSet.PrimaryKey);
string keyValue = GetPropertyValue(obj, tableKey);
string tableName = GetPropertyValue(obj, BaseSet.TableName);


Type t = obj.GetType();//获得该类的Type


StringBuilder strSQL = new StringBuilder();


strSQL.Append("insert into " + tableName + "(");


string fields = "";
string values = "";


//再用Type.GetProperties获得PropertyInfo[]
foreach (PropertyInfo pi in t.GetProperties())
{


object name = pi.Name;//用pi.GetValue获得值


// 替换Sql注入符
string value1 = Convert.ToString(pi.GetValue(obj, null)).Replace("'", "''");


//string dataType = pi.PropertyType.ToString().ToLower();


string properName = name.ToString().ToLower();


if (!string.IsNullOrEmpty(value1) && properName != tableKey.ToLower() && properName != BaseSet.PrimaryKey.ToLower() && properName != BaseSet.TableName.ToLower() && value1 != BaseSet.DateTimeLongNull && value1 != BaseSet.DateTimeShortNull)
{
// 判断是否为空
if (value1 == BaseSet.NULL)
{
value1 = "";
}


fields += Convert.ToString(name) + ",";
values += "'" + value1 + "',";


}


}


// 去掉最后一个,
fields = fields.TrimEnd(',');
values = values.TrimEnd(',');


// 拼接Sql串
strSQL.Append(fields);
strSQL.Append(") values (");
strSQL.Append(values);
strSQL.Append(")");


strSQL.Append(";SELECT @@IDENTITY;");


return strSQL;
}


/// <summary>
/// 获取实体的更新SQL串
/// </summary>
/// <typeparam name="T">泛型</typeparam>
/// <param name="obj">实体对象</param>
/// <returns>返回插入语句</returns>
private static StringBuilder GetUpdateSQL<T>(T obj)
{


string tableKey = GetPropertyValue(obj, BaseSet.PrimaryKey);
string keyValue = GetPropertyValue(obj, tableKey);
string tableName = GetPropertyValue(obj, BaseSet.TableName);
StringBuilder strSQL = new StringBuilder();


if (string.IsNullOrEmpty(keyValue))
{
return strSQL;
}


Type t = obj.GetType();//获得该类的Type


strSQL.Append("update " + tableName + " set ");


string subSQL = "";


string condition = " where " + tableKey + "='" + keyValue.Replace("'", "''") + "'";




//再用Type.GetProperties获得PropertyInfo[]
foreach (PropertyInfo pi in t.GetProperties())
{


object name = pi.Name;//用pi.GetValue获得值


// 替换Sql注入符
string value1 = Convert.ToString(pi.GetValue(obj, null)).Replace("'", "''");


//string dataType = pi.PropertyType.ToString().ToLower();


string properName = name.ToString().ToLower();


if (!string.IsNullOrEmpty(value1) && properName != tableKey.ToLower() && properName != BaseSet.PrimaryKey.ToLower() && properName != BaseSet.TableName.ToLower() && value1 != BaseSet.DateTimeLongNull && value1 != BaseSet.DateTimeShortNull)
{
// 判断是否为空
if (value1 == BaseSet.NULL)
{
value1 = "";
}


subSQL += Convert.ToString(name) + "='" + value1 + "',";


}


}


// 去掉最后一个,
subSQL = subSQL.TrimEnd(',');


// 拼接上更新子句
strSQL.Append(subSQL);


// 加入更新条件
strSQL.Append(condition);


return strSQL;


}


public class BaseSet
{
public static string NULL
{
get { return "@null"; }


}


public static string DateTimeShortNull
{
get { return "0001-1-1 0:00:00"; }


}


public static string DateTimeLongNull
{
get { return "0001-01-01 00:00:00"; }


}


public static string PrimaryKey
{
get { return "PrimaryKey"; }


}


public static string TableName
{
get { return "TableName"; }


}
}


#region 实体样例
[Serializable]
public class SortsInfo
{
private int _SortID;
private string _SortName;
public string TableName
{
get { return "Sorts"; }
}
public string PrimaryKey
{
get { return "SortID"; }
}
public int SortID
{
get { return _SortID; }
set
{
_SortID = value;
}
}
public string SortName
{
get { return _SortName; }
set
{
_SortName = value;
}
}


}


#endregion