C/C++ :: MySQL - Resultset Is Always Null
Jul 30, 2014
The resultset is always null and the connection is alive. The VS2013 debugger says that mysqlcppconn.dll has no debugging symbols. Tested the query on a mysql console and it worked fine, it returned 1.
CDatabase::CDatabase(CSettings* settings) {
settings = settings;
try {
Connection* con = get_driver_instance()->connect("", "", "");
con->setSchema("hyperbot");
cout << "Connected." << endl << endl;
[Code] .....
I also get these strange warnings on compile:
1>c:program files (x86)mysqlmysql connector c++ 1.1.3includecppconnsqlstring.h(38):
warning C4251: 'sql::SQLString::realStr' : class 'std::basic_string<char,std::char_traits<char>,std::allocator<char>>'
needs to have dll-interface to be used by clients of class 'sql::SQLString'
[Code] ......
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Feb 18, 2014
I am looking at one of the functions of an exercise:
void escape(char * s, char * t) {
int i, j;
i = j = 0;
while ( t[i] ) {
/* Translate the special character, if we have one */
switch( t[i] ) {
[code]...
Notice the while loop evaluates the current value in t to true or false. When we hit the null terminator, does that get evaluated as 0 and hence evaluates as a falsy value so the while loop exits?
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Mar 31, 2015
When you login to my site my loginservice which is done by ajax and json make a session called context.Session["Name"]. With BreakPoints it shows that everything is good and the variables are in place. However when I use Session["Name"] it comes out as null.
I will add my code at the bottem not
using System;
using System.Collections.Generic;
using System.Linq;
[Code].....
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Mar 26, 2013
I have so far tried MySQL++, ODBC, SimpleDB, and the MySQL C++ Connector. All of them give me a FLOOD of errors in the output. Is there an easy way to connect?
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Nov 26, 2013
I created a .h file for mysql connections. In my example file, I created an array of my class and made connection with the database for each subscript of the class object one by one. Then I checked if the connection in the previous subscripts are active or not, I found all the previous connection are disconnected.
I want to establish multiple connection with database at a time.
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Jun 6, 2014
I am trying to write a C code with embedded MySQL with server and client options. I am trying to important a csv data file for MySQL server and client.
I saw on internet like: LOAD DATA LOCAL INFILE 'data.csv' INTO TABLE test FIELDS TERMINATED BY',' LINES TERMINTED BY' ';
But I think that line is for SQL workspace. How to write in C format?
Code:
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include "/usr/include/mysql/mysql.h"
MYSQL *mysql;
MYSQL_RES *results;
MYSQL_ROW record;
static char *server_options[] = { "data.csv", "--defaults-file=my.cnf" };
int num_elements = sizeof(server_options)/ sizeof(char *);
[Code] ......
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Dec 2, 2013
I was created the mysql database in my Pc. This database connecting with vc++ code Using MySQL C++ Connection Example in Visual Studio. I done this work in single PC. It's working good. i viewed the table values using vc++ application.
But now want to connecting the database through lan connection. I refered the below link but i'm not clear.Step # 5 Grant access to remote IP address
For your reference, (I installed)
PC1 - visual studio 2003, mysql 5.6 for win32 & mysql connector (Ver : mysql-connector-c++-1.0.5-win32), OS : XP SP2, IP : 192.168.100.123
PC2 - mysql 5.6, OS: XP SP3, IP: 192,168,100.9
Table created in PC2, database name "test". server = 'localhost', user = 'root', passwd = "".
I like to connect PC1 & PC2 through Lan & access the table using vc++ code.
How can i view PC2's database table values in PC1?
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Jul 1, 2014
So even though I have so many issues with linking libraries, I apparently became the go-to person for a fellow college friend of mine for a sql library. He's using the mysql connector/c++ and his team has had quite a few issues getting it set up. I've solved two out of three issues:
1st issue I solved was that they didn't know how to build boost, I just linked it and they were good to go.
2nd issue I solved was that they were missing libmysql.lib, I just installed the mysql server onto their computer and linked that up. 3rd issue is where I am now stumped at, as they get a compile error: LNK2001 unresolved external symbol: _get_driver_instance().
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Feb 5, 2015
I don't understand when I'm only requesting a specific column on a unique row in MySQL that I'm being returned with data from all columns of that row.
My Select Statement - "select article from post where idpost=" + strIDpost + ";"
I should get:
|--- article -----|
"some article text"
Instead I get:
|-idpost-|-title-|---- article------|
1 title some article text
If I run the command directly to the database I get the results I'm looking for, but somehow while running the application, the program is managing to pull the entire row.
I'm using C# on a webform in Visual Studio '13. Here's my Code:
public static string GetConnectionString() {
string connStr = String.Format("server={0};user id={1}; password={2};" +
"database=dbname; pooling=false", "servername",
"dbUserID", "dbPassword");
[Code] .....
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May 8, 2014
Basically I have a few tables in my Database.
So I have one table that is like so:
Item_ID, Name, Parent ID.
1 , jeff , 5
and another table like this:
Parent_ID, parent_Name
5,jackson
What I would like to happen, when I run my code is that I'll get the following
Item_ID, Name, parent_Name
1 , jeff , jackson
DataSet DS = new DataSet();
if (this.OpenConnection() == true) {
mySqlDataAdapter = new MySqlDataAdapter("select Item_ID, NAME, Parent_ID from table1, table2", connection);
mySqlDataAdapter.Fill(DS);
dataGridView1.DataSource = DS.Tables[0];
//close connection
this.CloseConnection();
}
So this spit out parent ID = 5.
I've not worked with Dataset before and I was just wondering what is the best approach? Can this be done via a SQL command or will I have to replace the value(5) with the string(jackson) using a large IF loop to search and replace.
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Jul 10, 2014
I am currently developing a sync module using asp.net. I am getting data from an external database (mysql database) The problem is I am getting the error "Connection unexpectedly terminated" when filling the dataset.
Here's my code
string P_contact = "SELECT A.id, B.firstname, B.middlename, B.lastname FROM Accounts A, Contacts B WHERE A.id = B.id";
MySqlDataAdapter db_P_contact = new MySqlDataAdapter(P_contact, conn);
DataSet ds3 = new DataSet();
DataTable dt3 = new DataTable();
[Code] ....
I am getting the exception on this line of code:
db_P_contact.Fill(ds3, "P_contact");
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Feb 26, 2014
i wanted to insert Decimal Values in MySQL database, but decimal values has precision and in C# there is not option to specify precision point, the last column is size which is integer.
MySqlParameter MySqlParameterCollection.Add(string parameter Name,MySqlDBTYPE dbType,int size);
Here my Code and i get error on last Line
MySqlCommand insert = new MySqlCommand("Insert into
Plan(Plan_ID,Plan_Title,Plan_rate,Plan_Length)
values(@p_id,@p_t,@p_r,@p_l);", con);
insert.Parameters.Add("@p_id", MySqlDbType.VarChar, 10).Value = p.p_id;
insert.Parameters.Add("@p_t", MySqlDbType.VarChar, 45).Value = p.p_title;
insert.Parameters.Add("@p_r", MySqlDbType.Decimal,10,2)=p.p_rate;
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May 15, 2014
I just got this new project from my employer. He asked me to create a desktop application that could remotely access our sites database in cPanel.
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Apr 3, 2014
im trying to get the row id created when inserting, ive tried ; SCOPE_IDENTITY(), get_last_identity() adding it to the end of my query string but get nothing back, it doesnt even add row to database. ive also tried adding a stored procedure but it doesnt even have the option in adding that when i right click to add it,(i thinks its because im using microsoft Access MySql)
public static Boolean checkoutOrder(string CustomerEmailId) {
DateTime CreatedDate = DateTime.Now;
DateTime ShippedDateDate = DateTime.Now;
string CustomerId = CustomerEmailId;
OleDbConnection myConnection = GetConnection();
[Code] .....
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Jul 31, 2013
I wrote an application so I can manage the products for my e-commerce site. It uses MySQL 64 bit. Problem is some of my stores have in excess of 3 million products. The files that contain the data are all CSV. I parse the lines... format the data... write to table. On most of the stores which contain 10 - 60 thousand products it only takes max 3 min to write it all in. I have been running it on this one store for 6 hours now and it has barely made a dent. I know there are almost 3mil products in this one but it should be going much faster given what the speed was for the 60K stores. Is there a faster approach to handling a massive dump like this? I should also add that there are quite a few indexes. These indexes are there for ordering and fulltext search once the products have been activated on the site. I cannot create the table without the indexes and add them later since there is already preexisting data that is using the indexes.
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Jan 17, 2013
i am student working on a project in c# to maintain the datas from a solar battery monitoring.i already imported the datas from the battery monnitoring and saved them in mysql database and retrived the data in c#.
i have problem in retriving the data in accordance with the date and time range selection.
what i am trying to do is there are more than 1000 datas in the table if i select two date and time the datas in the table should cross check these dates and show all the datas in the table in between those date&time
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May 20, 2014
I'm using VS 2012. Installed MYSQL 5.6, C++ Connector 1.1.3. Created a sample table using mysql. Now i like to create a connect between mysql and MFC dialog. Using this, i was try to connect.
Server Explorer -> Data Connection -> Add Connections ->MYSQL Database -> Addconnection
To get the connection, i want to enter the connection settings like:
server host name = localhost, user name =root, password=
If I pressed any letter in the keyboard means add connection dialog was closed automatically.
How to connect mysql(localhost) with MFC Dialog?
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Nov 13, 2014
How can i read particular record in a table quickly via VC++ from MYSQL?
I have a table like
Code:
Database name: test & Table name : Profilemaster
+-----+--------+
| PID | PNAME |
+-----+--------+
| 1 | APPLE1 |
| 2 | APPLE2 |
| 3 | APPLE3 |
| 4 | APPLE4 |
| 5 | APPLE5 |
+-----+--------+
My code is here, I was read all profilename from MYSQL database and load it to a combobox.
How can i read a particular record and store it to combobox?
Code:
void MainScreen::OnreadProfileName() {
// TODO: Add your control notification handler code here
CDatabase database;
CString SqlString;
CString sDsn;
CString pname;
[code].....
How can i execute this query and get the following result
SqlString = "SELECT PNAME FROM PROFILEMASTER WHERE PID =1;";
Code:
+-----+--------+
| PID | PNAME |
+-----+--------+
| 1 | APPLE1 |
+-----+--------+
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Aug 18, 2012
I was looking at this code:
private void button1_Click(object sender, EventArgs e)
{
string input = textBox3.Text;
[Code].....
And how to rewrite the code so that it display the MySQL table data for a specific user I already have a string called username and that stores the username entered on the login form. I want the code to use the username string to search for the name and display that users info.
My table contents are: username
First name
Last name
Position
Employee Id
Airline
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Dec 15, 2014
I have written an SQL statement that would:
1) Count the number of rows in the table booking that are open and where the booking.postcode is "MK",
2) Take a note of the plot (in booking.plot_id), and then update the table plot.jobs with the value count.
For example running the SQL query when booking table has the following rows:
Would see the following highlighted values in plot.jobs being updated to 1:
I managed to resolve it with this code so far (note I am using Connector/Net):
public void RefreshPlot(){
string query =
"SELECT Count(*) AS count, plot_id FROM booking WHERE postcode='MK' AND status='open' GROUP BY plot_id";
var cmd = new MySqlCommand(query, _connection);
var da = new MySqlDataAdapter(cmd);
var dtCounts = new DataTable();
da.Fill(dtCounts);
[code]....
Currently, my code only checks for existing rows in the booking table and updates the plot table. However if the row gets deleted in the booking, then the changes are not reflected in the plot table.
Example: If we delete the row with plot.id=1 and plot.plot_id=4, then booking.plot_id should go back to being 0, if it was initially 1. At the moment, it doesn't. How would I update my SQL statement to better reflect this? In a sense, it should check for "non-existent" rows, i.e. the impact that the row plot.plot_id=4 & plot.id=1 has on booking.plot_id when deleted?
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Mar 25, 2013
I have a C# .NET Application which get data from QuickBooks via the ODBC Driver and save the result to C# data table. So, I want to transfer this data table to a mysql table on my own server. That's the code I use:
using System.IO;
using MySql.Data.MySqlClient;
//Add mysql dll on the .NET Tab in Project's references
string connStr = "DSN=QBTest;";
string myServerAddress = "192.168.0.243";
string myDataBase = "CostTest";
[Code] ....
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Oct 15, 2014
For some reason I keep getting null pointers in most of my functions, and in my convertTime function the numbers are way higher than they should be.
Code:
//Utils.H header file----------------------------------------------
//This function takes the radius of a circle and returns the diameter, the circumference and the area.
int circleStatistics(double radius, double *diameter, double *circumference, double *area);
//This function takes a number of days and returns how many years, weeks and remaining days that is.
int convertTime(int days, int *y, int *w, int *d);
//This function takes a length of time and calculates the dilation of that time at a percentage of the speed of light.
int lorentzTimeDilation(double normalTime, double percentC, double *dilatedTime);
[Code] ....
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Apr 13, 2014
Is:
char *endp = NULL;
the same thing as:
char *endp = 0;
?
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Jul 23, 2013
I am beginner in C++ programming. And i was try use STRTOK code with NULL fields, but in ARRAY fields NULL values is skiped. For example:
input text in Memo2:
AnsiString PAT02[100][20];
for (int IndexVRadku02 = 0; IndexVRadku02 < Memo2->Lines->Count ; IndexVRadku02++) {
AnsiString PNF02 = Memo2->Lines->Strings[IndexVRadku02];
char * PN02;
[Code] ....
Result:
Array 00 01 02 03 04 05
00 0000 TEXT1 TEXT2
01 0002 TEXT3 TEXT4 TEXT5
02 0003 TEXT6
But i need this result:
Array 00 01 02 03 04 05
00 0000 TEXT1 TEXT2
01 0002 TEXT3 TEXT4 TEXT5
02 0003 TEXT6
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Jul 9, 2014
I dont see any point of NULL in cstring. The code given below just outputs same as it would have done with NULL. My understanding is if size of char array is less than length of char array then null must be manually added?
#include <iostream>
using namespace std;
int main(){
char chr[0];
cin>>chr;//or if you use cin.getline;
cout<<chr<<endl;
return 0;
}
Enter something: hellowwwww
hellowwwww
Segmentation fault (core dumped)
why? for NULL char or something else?
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Apr 9, 2014
In my raytracer-project I have the following function:
bool hitObjects(Ray &ray, std::vector<Object *> &objects, Vector3& normal, Material *mat) {
double tmin = K_HUGE_VALUE;
double t;
[Code]....
When I try to run this, I only get the message "Material pointer is null". So, somehow the pointer is null after the hitObjects-function is called, even though it isn't inside that function.
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