custom3.cpp
上传用户:dzyhzl
上传日期:2019-04-29
资源大小:56270k
文件大小:2k
- #include <iostream>
- #include <vector>
- #include <sqlplus.hh>
- #include <custom.hh>
- #include "util.hh"
- // util.hh/cc contains the print_stock_table function
- sql_create_5(stock, 1, 5, string, item, int, num,
- double, weight, double, price, Date, sdate)
- int main() {
- try { // its in one big try block
- Connection con(use_exceptions);
- con.connect("mysql_cpp_data");
- Query query = con.query();
- query << "select * from stock where item = "Hotdogs' Buns" ";
-
- Result res = query.store();
- if (res.empty())
- throw BadQuery("Hotdogs' Buns not found in table, run reset-db");
- // here we are testing if the query was successful, if not throw a bad query
- stock row = res[0];
- // because there should only be one row in this query we don't
- // need to use a vector. Just store the first row directly in
- // "row". We can do this because one of the constructors for
- // stock takes a Row as an parameter.
- stock row2 = row;
- // Now we need to create a copy so that the replace query knows
- // what the original values are.
- row.item = "Hotdog Buns"; // now change item
- query.update(row2, row);
- // form the query to replace the row
- // the table name is the name of the struct by default
- cout << "Query : " << query.preview() << endl;
- // show the query about to be executed
- query.execute();
- // execute a query that does not return a result set
- print_stock_table(query);
- // now print the new table;
-
- return 0;
-
- } catch (BadQuery er) {
- cerr << "Error: " << er.error << endl;
- return -1;
- } catch (BadConversion er) {
- cerr << "Error: Tried to convert "" << er.data << "" to a ""
- << er.type_name << ""." << endl;
- return -1;
- }
- }