/// <summary>
/// 返回查询语句（废用）
/// </summary>
/// <param name="type"></param>
/// <param name="filter"></param>
/// <returns></returns>
public static string GetSelect(Type type, ModelFilter filter)
{
PropertyInfo[] fields = type.GetProperties();
StringBuilder sql = new StringBuilder();
sql.Append("SELECT ");
int i = 0;
foreach (var field in fields)
{
sql.Append(field.Name);
if (i++ < fields.Length - 1)
{
sql.Append(",");
}
}
sql.Append(" FROM ");
sql.Append(type.Name);
return(sql.ToString());
}
/// <summary>
/// 查询一行记录
/// </summary>
/// <param name="filter">过滤器</param>
/// <returns>返回单条数据</returns>
public CModel GetModel(ModelFilter filter)
{
string sql = filter.ExecuteSql.ToString();
CModel model = null;
try
{
SqlDataReader reader = SqlRequest.GetReader(sql, filter.GetParams());
while (reader.Read())
{
model = new CModel(filter.TableName);
foreach (var field in filter.Fields)
{
model[field] = reader[field];
}
}
reader.Close();
return(model);
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// 删除一行或多行记录
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="filter"></param>
public void DeleteModel(ModelFilter filter)
{
string sql = SqlSplice.GetDelete(filter);
try
{
SqlRequest.Update(sql, filter.Params.ToArray());
}
catch (Exception ex)
{
throw new Exception("删除记录出错了", ex);
}
}
/// <summary>
/// 查询多行记录
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="filter">过滤器</param>
/// <returns></returns>
public List <T> GetModels <T>(ModelFilter filter)
{
Type type = typeof(T);
string sql = filter.ExecuteSql.ToString();
List <CModel> models = new List <CModel>();
try
{
SqlDataReader reader = SqlRequest.GetReader(sql, filter.Params.ToArray());
while (reader.Read())
{
CModel model = new CModel(type);
foreach (var field in model.Fields)
{
model[field] = reader[field];
}
models.Add(model);
}
reader.Close();
List <T> m_objs = new List <T>();
if (models.Count <= 0)
{
return(m_objs);
}
foreach (var model in models)
{
T m_obj = JsonConverter.CModelToModel <T>(model);
m_objs.Add(m_obj);
}
return(m_objs);
}
catch (Exception ex)
{
throw new Exception("查询多行记录出错了", ex);
}
}
/// <summary>
/// 查询一行记录
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns>返回一条记录</returns>
public T GetModel <T>(ModelFilter filter)
{
string sql = filter.ExecuteSql.ToString();
CModel model = null;
try
{
SqlDataReader reader = SqlRequest.GetReader(sql, filter.GetParams());
while (reader.Read())
{
model = new CModel(filter.TableName);
foreach (var field in filter.Fields)
{
model[field] = reader[field];
}
}
T m_obj = default(T);
reader.Close();
if (model == null)
{
return(m_obj);
}
//string str = JsonConverter.SerializeObject(model.FieldsValue);
//m_obj = JsonConverter.JsonDeserialize<T>(str);
m_obj = JsonConverter.CModelToModel <T>(model);
return(m_obj);
}
catch (Exception ex)
{
throw new Exception("查询一行数据出错了", ex);
}
}
/// <summary>
/// 返回删除语句
/// </summary>
/// <param name="filter">过滤器</param>
/// <returns></returns>
public static string GetDelete(ModelFilter filter)
{
StringBuilder sql = new StringBuilder();
List <string> param_names = filter.ParamNames;
sql.Append($"DELETE FROM {filter.TableName} WHERE ");
int i = 0;
foreach (var param in param_names)
{
if (i++ > 0)
{
sql.Append(",");
}
sql.Append($"{param}=@{param}");
}
return(sql.ToString());
}