/// <summary>
/// 根据Model插入一条数据。若主键字段为int型，则将主键看作为自增长不会显示插入；若主键字段为string型，可显示指定ID值，放空将调用GET_NEWID获取一个新的ID
/// </summary>
/// <param name="obj">要插入的Model</param>
/// <returns></returns>
public int Insert(T obj)
{
if (obj != null)
{
Type t = typeof(T);
PropertyInfo fi = t.GetProperty(this.PrimaryMember);
string id = fi.GetValue(obj, null) + "";
if (id.Length == 0 && this.PrimaryKeyIsStr)
{
id = this.GetNewID();
}
StringBuilder columns = new StringBuilder();
StringBuilder values = new StringBuilder();
List <MySqlParameter> listParam = new List <MySqlParameter>();
foreach (string item in this.ColumnMapping.Keys)
{
if (item != this.PrimaryMember)
{
PropertyInfo f = t.GetProperty(item);
Object[] objAttrs = f.GetCustomAttributes(typeof(ColumnameAttribute), false);
ColumnameAttribute tn = objAttrs[0] as ColumnameAttribute;
if (tn.canInsert && f.Name != this.PrimaryMember)
{
object value = this.GetValue(f, obj);
if (value == null && tn.DefaultValue != null)
{
value = tn.DefaultValue;
}
columns.Append("," + this.ColumnMapping[item]);
values.Append(",?" + item);
listParam.Add(new MySqlParameter("?" + item, value));
}
}
}
if (columns.Length > 0)
{
columns.Remove(0, 1);
values.Remove(0, 1);
}
string sql = "insert into {0}({3}{1}) values({4}{2})";
if (this.PrimaryKeyIsStr)
{
sql = "insert into {0}({3}{1}) select {4}{2} from dual where not exists (select * from {0} where " + this.PrimaryKey + "=?" + this.PrimaryKey + ")";
sql = string.Format(sql, this.TableName, columns.ToString(), values.ToString(), this.PrimaryKey + ",", "?" + this.PrimaryMember + ",");
listParam.Add(new MySqlParameter("?" + this.PrimaryMember, id));
listParam.Add(new MySqlParameter("?" + this.PrimaryKey, id));
}
else
{
sql = string.Format(sql, this.TableName, columns.ToString(), values.ToString(), "", "");
}
return(this.ExecuteSql(sql, listParam.ToArray()));
}
return(0);
}
public ModelAdo()
: base()
{
Type t = typeof(T);
if (t.IsDefined(typeof(TablenameAttribute), false))
{
Object[] objAttrs = t.GetCustomAttributes(typeof(TablenameAttribute), false);
TablenameAttribute tn = objAttrs[0] as TablenameAttribute;
this.ViewName = tn.ViewName;
this.TableName = tn.TableName;
this.PrimaryKey = tn.PrimaryKey;
}
if (this.TableName.Length == 0 || this.PrimaryKey.Length == 0)
{
throw new Exception("未给T设置类属性TablenameAttribute");
}
else
{
PropertyInfo[] fis = t.GetProperties();
foreach (PropertyInfo item in fis)
{
if (item.IsDefined(typeof(ColumnameAttribute), false))
{
Object[] objAttrs = item.GetCustomAttributes(typeof(ColumnameAttribute), false);
ColumnameAttribute tn = objAttrs[0] as ColumnameAttribute;
ColumnMapping[item.Name] = tn.Name;
if (tn.Name == this.PrimaryKey)
{
this.PrimaryMember = item.Name;
if (item.PropertyType == typeof(string))
{
this.PrimaryKeyIsStr = true;
}
}
}
}
if (this.PrimaryMember.Length == 0)
{
throw new Exception("未在类上标记主键字段");
}
}
}
/// <summary>
/// 根据Model修改一条数据，此修改会以ID作为修改条件
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public int Update(T obj)
{
if (obj != null)
{
Type t = typeof(T);
PropertyInfo fi = t.GetProperty(this.PrimaryMember);
string id = fi.GetValue(obj, null) + "";
if (id.Length > 0)
{
string sql = "update {0} set {1} where {2}=?" + this.PrimaryMember;
List <MySqlParameter> listParam = new List <MySqlParameter>();
StringBuilder sb = new StringBuilder("");
foreach (string item in this.ColumnMapping.Keys)
{
PropertyInfo f = t.GetProperty(item);
Object[] objAttrs = f.GetCustomAttributes(typeof(ColumnameAttribute), false);
ColumnameAttribute tn = objAttrs[0] as ColumnameAttribute;
if (tn.canUpdate || f.Name == this.PrimaryMember)
{
object value = this.GetValue(f, obj);
if (value == null && tn.DefaultValue != null)
{
value = tn.DefaultValue;
}
if (item != this.PrimaryMember)
{
sb.Append(string.Format(",{0}=?{1}", this.ColumnMapping[item], item));
}
listParam.Add(new MySqlParameter("?" + item, value));
}
}
if (sb.Length > 0)
{
sb.Remove(0, 1);
}
sql = string.Format(sql, this.TableName, sb.ToString(), this.PrimaryKey);
return(this.ExecuteSql(sql, listParam.ToArray()));
}
}
return(0);
}
