//按批更新图书信息
public int ModifyBookInfo(Book original, Book lastest)
{
OracleDataReader reader = FetchBook(original);
int sccess_count = 0;
while (reader.Read())
{
string sql = "update Book set ";
string format = "";
if (lastest.IsbnHasData())
{
sql += "b_isbn = '" + lastest.isbn + "'"; format = " , ";
}
if (lastest.TitleHasData())
{
sql += format + "b_title = '" + lastest.title + "'"; format = " , ";
}
if (lastest.AmountHasData())
{
sql += format + "b_author = '" + lastest.author + "'"; format = " , ";
}
if (lastest.LanguageHasData())
{
sql += format + "b_language = '" + lastest.language + "'"; format = " , ";
}
if (lastest.AmountHasData())
{
sql += format + "b_amount = " + lastest.amount; format = " , ";
}
if (lastest.PublisherHasData())
{
sql += format + "b_publisher = '" + lastest.publisher + "'"; format = " , ";
}
if (lastest.Cost_priceHasData())
{
sql += format + "b_cost_price = " + lastest.cost_price; format = " , ";
}
if (lastest.Sell_priceHasData())
{
sql += format + "b_sell_price = " + lastest.sell_price; format = " , ";
}
if (lastest.Shelf_idHasData())
{
sql += format + "shel_id = '" + lastest.shelf_id + "'"; format = " , ";
}
if (lastest.Type_idHasData())
{
sql += format + "tp_id = '" + lastest.type_id + "'"; format = " , ";
}
sql += " where b_isbn = " + reader[reader.GetOrdinal("b_isbn")];
ctrl.ExecNonQuery(sql);
sccess_count += 1;
}
return(sccess_count);
}
//获取符合条件的书籍的OracleReader
private OracleDataReader FetchBook(Book book)
{
if (!book.HasAnyData())
{
return(null);
}
string sql = "select * from Book where ";
string format = "";
if (book.IsbnHasData())
{
sql += "b_isbn = '" + book.isbn + "'"; format = " and ";
}
if (book.TitleHasData())
{
sql += format + "b_title = '" + book.title + "'"; format = " and ";
}
if (book.AuthorHasData())
{
sql += format + "b_author = '" + book.author + "'"; format = " and ";
}
if (book.LanguageHasData())
{
sql += format + "b_language = '" + book.language + "'"; format = " and ";
}
if (book.AmountHasData())
{
sql += format + "b_amount = " + book.amount; format = " and ";
}
if (book.PublisherHasData())
{
sql += format + "b_publisher = '" + book.publisher + "'"; format = " and ";
}
if (book.Cost_priceHasData())
{
sql += format + "b_cost_price = " + book.cost_price; format = " and ";
}
if (book.Sell_priceHasData())
{
sql += format + "b_sell_price = " + book.sell_price; format = " and ";
}
if (book.Shelf_idHasData())
{
sql += format + "shel_id = '" + book.shelf_id + "'"; format = " and ";
}
if (book.Type_idHasData())
{
sql += format + "tp_id = '" + book.type_id + "'"; format = " and ";
}
OracleDataReader reader = ctrl.ExecuteReader(sql);
return(reader);
}