/// <summary>
/// 删除一条数据
/// </summary>
public bool Delete(int id)
{
Dapper.Model.article_attribute_field model = GetModel(id);//取得扩展字段实体
using (SqlConnection conn = new SqlConnection(DbHelperSQL.connectionString))
{
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
{
try
{
//删除所关联的频道数据表相关列
DataTable dt = new DAL.site_channel(databaseprefix).GetFieldList(conn, trans, id).Tables[0];
if (dt.Rows.Count > 0)
{
foreach (DataRow dr in dt.Rows)
{
//检查有无该频道数据表和列
int rowsCount = Convert.ToInt32(DbHelperSQL.GetSingle(conn, trans, "select count(1) from syscolumns where id=object_id('" + databaseprefix + DTKeys.TABLE_CHANNEL_ARTICLE + dr["name"].ToString() + "') and name='" + model.name + "'"));
if (rowsCount > 0)
{
//删除频道数据表一列
DbHelperSQL.ExecuteSql(conn, trans, "alter table " + databaseprefix + DTKeys.TABLE_CHANNEL_ARTICLE + dr["name"].ToString() + " drop column " + model.name);
}
}
}
//删除频道关联字段表
StringBuilder strSql1 = new StringBuilder();
strSql1.Append("delete from " + databaseprefix + "site_channel_field");
strSql1.Append(" where field_id=@field_id");
SqlParameter[] parameters1 =
{
new SqlParameter("@field_id", SqlDbType.Int, 4)
};
parameters1[0].Value = id;
DbHelperSQL.ExecuteSql(conn, trans, strSql1.ToString(), parameters1);
//删除扩展字段主表
StringBuilder strSql = new StringBuilder();
strSql.Append("delete from " + databaseprefix + "article_attribute_field");
strSql.Append(" where id=@id");
SqlParameter[] parameters =
{
new SqlParameter("@id", SqlDbType.Int, 4)
};
parameters[0].Value = id;
DbHelperSQL.ExecuteSql(conn, trans, strSql.ToString(), parameters);
trans.Commit();//提交事务
}
catch
{
trans.Rollback();//回滚事务
return(false);
}
}
}
return(true);
}
/// <summary>
/// 得到一个对象实体
/// </summary>
public Dapper.Model.article_attribute_field GetModel(int id)
{
StringBuilder strSql = new StringBuilder();
StringBuilder str1 = new StringBuilder();
Dapper.Model.article_attribute_field model = new Dapper.Model.article_attribute_field();
//利用反射获得属性的所有公共属性
Type modelType = model.GetType();
PropertyInfo[] pros = modelType.GetProperties();
foreach (PropertyInfo p in pros)
{
str1.Append(p.Name + ",");//拼接字段
}
strSql.Append("select top 1 " + str1.ToString().Trim(','));
strSql.Append(" from " + databaseprefix + "article_attribute_field");
strSql.Append(" where id=@id");
SqlParameter[] parameters =
{
new SqlParameter("@id", SqlDbType.Int, 4)
};
parameters[0].Value = id;
DataTable dt = DbHelperSQL.Query(strSql.ToString(), parameters).Tables[0];
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows[0].Table.Columns.Count; i++)
{
//查找实体是否存在列表相同的公共属性
PropertyInfo proInfo = modelType.GetProperty(dt.Rows[0].Table.Columns[i].ColumnName);
if (proInfo != null && dt.Rows[0][i] != DBNull.Value)
{
proInfo.SetValue(model, dt.Rows[0][i], null);//用索引值设置属性值
}
}
return(model);
}
else
{
return(null);
}
}
/// <summary>
/// 增加一条数据
/// </summary>
public int Add(Dapper.Model.article_attribute_field model)
{
StringBuilder strSql = new StringBuilder();
StringBuilder str1 = new StringBuilder(); //数据字段
StringBuilder str2 = new StringBuilder(); //数据参数
//利用反射获得属性的所有公共属性
PropertyInfo[] pros = model.GetType().GetProperties();
List <SqlParameter> paras = new List <SqlParameter>();
strSql.Append("insert into " + databaseprefix + "article_attribute_field(");
foreach (PropertyInfo pi in pros)
{
//如果不是主键则追加sql字符串
if (!pi.Name.Equals("id"))
{
//判断属性值是否为空
if (pi.GetValue(model, null) != null)
{
str1.Append(pi.Name + ","); //拼接字段
str2.Append("@" + pi.Name + ","); //声明参数
paras.Add(new SqlParameter("@" + pi.Name, pi.GetValue(model, null))); //对参数赋值
}
}
}
strSql.Append(str1.ToString().Trim(','));
strSql.Append(") values (");
strSql.Append(str2.ToString().Trim(','));
strSql.Append(") ");
strSql.Append(";select @@IDENTITY;");
object obj = DbHelperSQL.GetSingle(strSql.ToString(), paras.ToArray());
if (obj == null)
{
return(0);
}
else
{
return(Convert.ToInt32(obj));
}
}
/// <summary>
/// 更新一条数据
/// </summary>
public bool Update(Dapper.Model.article_attribute_field model)
{
Dapper.Model.article_attribute_field oldModel = GetModel(model.id);//取到旧的数据
using (SqlConnection conn = new SqlConnection(DbHelperSQL.connectionString))
{
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
{
try
{
//修改主表信息
StringBuilder strSql = new StringBuilder();
StringBuilder str1 = new StringBuilder();
//利用反射获得属性的所有公共属性
PropertyInfo[] pros = model.GetType().GetProperties();
List <SqlParameter> paras = new List <SqlParameter>();
strSql.Append("update " + databaseprefix + "article_attribute_field set ");
foreach (PropertyInfo pi in pros)
{
//如果不是主键则追加sql字符串
if (!pi.Name.Equals("id"))
{
//判断属性值是否为空
if (pi.GetValue(model, null) != null)
{
str1.Append(pi.Name + "=@" + pi.Name + ","); //声明参数
paras.Add(new SqlParameter("@" + pi.Name, pi.GetValue(model, null))); //对参数赋值
}
}
}
strSql.Append(str1.ToString().Trim(','));
strSql.Append(" where id=@id ");
paras.Add(new SqlParameter("@id", model.id));
DbHelperSQL.ExecuteSql(conn, trans, strSql.ToString(), paras.ToArray());
//检查字段名和类型有无变化
if (oldModel.name.ToLower() != model.name.ToLower() || oldModel.data_type.ToLower() != model.data_type.ToLower())
{
DataTable dt = new DAL.site_channel(databaseprefix).GetFieldList(conn, trans, model.id).Tables[0];
if (dt.Rows.Count > 0)
{
foreach (DataRow dr in dt.Rows)
{
//检查有无该频道数据表和列
int rowsCount = Convert.ToInt32(DbHelperSQL.GetSingle(conn, trans, "select count(1) from syscolumns where id=object_id('" + databaseprefix + DTKeys.TABLE_CHANNEL_ARTICLE + dr["name"].ToString() + "') and name='" + oldModel.name + "'"));
if (rowsCount > 0)
{
//修改列数据类型
if (oldModel.data_type.ToLower() != model.data_type.ToLower())
{
DbHelperSQL.ExecuteSql(conn, trans, "alter table " + databaseprefix + DTKeys.TABLE_CHANNEL_ARTICLE + dr["name"].ToString() + " alter column " + oldModel.name + " " + model.data_type);
}
//修改列名
if (oldModel.name.ToLower() != model.name.ToLower())
{
DbHelperSQL.ExecuteSql(conn, trans, "exec sp_rename '" + databaseprefix + DTKeys.TABLE_CHANNEL_ARTICLE + dr["name"].ToString() + "." + oldModel.name + "','" + model.name + "','column'");
}
}
}
}
}
trans.Commit();//提交事务
}
catch
{
trans.Rollback();//回滚事务
return(false);
}
}
}
return(true);
}