/// <summary>
/// 根据对象生成insert语句返回
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public string Sql_Insert(Sephiroth_IDao.BaseEntity model)
{
StringBuilder sql = new StringBuilder();
//生成主键
model.SetInsertKey();
sql.AppendFormat("insert into {0} ", model.GetTableName());//表名
List<string> cols = new List<string>();
List<string> vals = new List<string>();
//映射字段 并且 属性值不为 空
var properties = model.GetType().GetProperties().Where(p =>
!model.PropertyNotMapped(p)
&& p.GetValue(model) != null
&& p.GetValue(model) != DBNull.Value).ToList();
properties.ForEach(pa =>
{
ColumnAttribute col = model.PropertyColumn(pa);
cols.Add(col == null ? pa.Name : col.Name);//有列名特性用特性没特性用属性名
vals.Add(string.Format("@{0}", pa.Name));//根据属性名生成参数
});
if (cols.Count == 0)
throw new Exception("colums count is zero");//输出异常 没有列符合数据
sql.AppendFormat("({0}) values ({1}) ;", string.Join(",", cols), string.Join(",", vals));
return sql.ToString();
}
/// <summary>
/// 根据对象生成delete语句返回
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public string Sql_Delete(Sephiroth_IDao.BaseEntity model)
{
StringBuilder sql = new StringBuilder();
List<string> strkey = new List<string>();
//映射字段 并且 属性值不为 空
model.GetType().GetProperties().Where(p =>
!model.PropertyNotMapped(p)
&& p.GetValue(model) != null
&& p.GetValue(model) != DBNull.Value).ToList()
.ForEach(pa =>
{
ColumnAttribute col = model.PropertyColumn(pa);
string temp = string.Format(" {0} = @{1} ", col == null ? pa.Name : col.Name, pa.Name);
strkey.Add(temp);
});
if (strkey.Count == 0)
throw new Exception("pk count is zero");
sql.AppendFormat("delete {0} where {1} ", model.GetTableName(), string.Join(" and ", strkey));
return sql.ToString();
}
/// <summary>
/// 根据对象生成select
/// </summary>
/// <param name="model">对象</param>
/// <param name="columns">获取列</param>
/// <param name="wheres">自定义条件</param>
/// <returns></returns>
public string Sql_Select(Sephiroth_IDao.BaseEntity model, IEnumerable<string> columns = null, string wheres = "")
{
StringBuilder sql = new StringBuilder();
List<string> strcolumn = new List<string>();
if (columns != null && columns.Count() > 0)
strcolumn.AddRange(columns);//自定义条件组成
List<string> strwhere = new List<string>();
strwhere.Add(" 1=1 ");//占位条件
if (wheres != "")
strwhere.Add(wheres);
if (columns == null || wheres == "")//如果条件和获取列都已经指定则不需要根据属性进行遍历
{
model.GetType().GetProperties().Where(p => !model.PropertyNotMapped(p))
.ToList()
.ForEach(pa =>
{
ColumnAttribute ca = model.PropertyColumn(pa);
if (columns == null)//自动生成列名
{
if (ca == null)
strcolumn.Add(pa.Name);
else
strcolumn.Add(string.Format("{0} {1}", ca.Name,
ca.Name == pa.Name ? "" : " as " + pa.Name));
}
if (wheres == "")//自动生成条件
{
if (pa.GetValue(model, null) != null && pa.GetValue(model, null) != DBNull.Value)//属性值不为空
{
string temp = string.Format(" {0} = @{1} ", ca == null ? pa.Name : ca.Name, pa.Name);
strwhere.Add(temp);
}
}
});
}
if (strcolumn.Count == 0)
throw new Exception("columns count is zero");
sql.AppendFormat(" select {0} from {1} where {2} ;", string.Join(",", strcolumn), model.GetTableName(), string.Join(" and ", strwhere));
return sql.ToString();
}
/// <summary>
/// 根据model生成update语句返回
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public string Sql_Update(Sephiroth_IDao.BaseEntity model)
{
//获取属性
var pArray = model.GetType().GetProperties().ToList();
//判断特性当前表字段生成 表字段不等于当前对象特性 tablename 则认为不是当前字段
StringBuilder sql = new StringBuilder();
sql.AppendFormat("update {0} set ", model.GetTableName());
List<string> strset = new List<string>();
List<string> strkey = new List<string>();
//映射字段 并且 属性值不为 空
pArray.Where(p => !model.PropertyNotMapped(p)
&& p.GetValue(model) != null
&& p.GetValue(model) != DBNull.Value).ToList().ForEach(pa =>
{
ColumnAttribute col = model.PropertyColumn(pa);
string temp = string.Format(" {0} = @{1} ", col == null ? pa.Name : col.Name, pa.Name);
if (model.PropertyKey(pa))
strkey.Add(temp);
else
strset.Add(temp);
});
if (strset.Count == 0)
throw new Exception("colums count is zero");
if (strkey.Count == 0)
throw new Exception("pk count is zero");
sql.AppendFormat(" {0} where {1}", string.Join(" , ", strset), string.Join(" and ", strkey));
return sql.ToString();
}
