/// <summary>
/// 更新实体
/// </summary>
/// <param name="primaryField"></param>
/// <param name="fields"></param>
public void Update(PrimaryKeyValueDictionary primaryField, params FieldValueDictionary[] fields)
{
StringBuilder sb = new StringBuilder(300);
sb.Append("update " + tableName + " set ");
IList <DbParameter> parameters = new List <DbParameter>();
string fieldName = null;
foreach (FieldValueDictionary f in fields)
{
fieldName = f.GetFieldName();
sb.Append(fieldName + "=@" + fieldName + ",");
parameters.Add(db.DataBaseAdapter.CreateParameter("@" + fieldName, f.Value));
}
sb.Remove(sb.Length - 1, 1); //删除最后的,
fieldName = primaryField.GetFieldName();
sb.Append(" where " + fieldName + "=@" + fieldName);
parameters.Add(db.DataBaseAdapter.CreateParameter("@" + fieldName, primaryField.Value));
db.ExecuteNonQuery(sb.ToString(), parameters.ToArray());
}
/// <summary>
/// 根据主键获取单个实体
/// </summary>
/// <param name="primaryField"></param>
/// <returns></returns>
public Entity Get(PrimaryKeyValueDictionary primaryField)
{
string fieldName = primaryField.GetFieldName();
string sql = "SELECT TOP 1 * FROM " + tableName +
" WHERE " + fieldName + "=@" + fieldName;
Entity obj = null;
ColumnAttribute attr;
Type type = typeof(Entity);
Assembly ass = type.Assembly;
db.ExecuteReader(new SqlQuery(sql, new object[, ]
{
{ "@" + fieldName, primaryField.Value }
}), rd =>
{
object[] attrs; //columnAttributes
while (rd.Read())
{
obj = ass.CreateInstance(type.ToString(), true) as Entity;
foreach (PropertyInfo p in properties)
{
attrs = p.GetCustomAttributes(typeof(ColumnAttribute), true);
if (attrs.Length == 0)
{
continue;
}
attr = attrs[0] as ColumnAttribute;
p.SetValue(obj, Convert.ChangeType(rd[attr.Name ?? p.Name],
p.PropertyType), null);
}
break;
}
});
return(obj);
}
