Hello Group,

I am looking for some help with DevC++ compiler. Version 4.9.9.2. In my database Management II Course, we are supposed to compile a sample ODBC Application written in C Code. When I open the compiler, I cut and pasted the code into the work space because the code is rather long. I've read in other C forum that the error messages I am getting is due to a linkage problem with SQL libraries. Can someone explain the proper steps to fixing this problem of my. I have been trying to figure this out for the past 5 days and could not seem to find a good manuel or tutorial about SQL Libraries and how to link them. Here is the error messages I am getting:



Compiler: Default compiler
Building Makefile: "C:\Dev-Cpp\Makefile.win"
Executing make...
make.exe -f "C:\Dev-Cpp\Makefile.win" all
gcc.exe main.o -o "Sample.c" -L"C:/Dev-Cpp/lib"
main.o(.text+0x72):main.c: undefined reference to `SQLGetDiagField@28'
main.o(.text+0xe2):main.c: undefined reference to `SQLGetDiagRec@32'
main.o(.text+0x1c0):main.c: undefined reference to `SQLAllocHandle@12'
main.o(.text+0x1f8):main.c: undefined reference to `SQLSetEnvAttr@16'
main.o(.text+0x227):main.c: undefined reference to `SQLAllocHandle@12'
main.o(.text+0x26b):main.c: undefined reference to `SQLConnect@28'
main.o(.text+0x2a5):main.c: undefined reference to `SQLAllocHandle@12'
main.o(.text+0x323):main.c: undefined reference to `SQLPrepare@12'
main.o(.text+0x3bd):main.c: undefined reference to `SQLBindParameter@40'
main.o(.text+0x457):main.c: undefined reference to `SQLBindParameter@40'
main.o(.text+0x4f1):main.c: undefined reference to `SQLBindParameter@40'
main.o(.text+0x58b):main.c: undefined reference to `SQLBindParameter@40'
main.o(.text+0x61d):main.c: undefined reference to `SQLExecute@4'
main.o(.text+0x6b9):main.c: undefined reference to `SQLPrepare@12'
main.o(.text+0x753):main.c: undefined reference to `SQLBindParameter@40'
main.o(.text+0x7b9):main.c: undefined reference to `SQLExecute@4'
main.o(.text+0x80c):main.c: undefined reference to `SQLBindCol@24'
main.o(.text+0x844):main.c: undefined reference to `SQLBindCol@24'
main.o(.text+0x859):main.c: undefined reference to `SQLFetch@4'
main.o(.text+0x8db):main.c: undefined reference to `SQLEndTran@12'
main.o(.text+0x8fb):main.c: undefined reference to `SQLFreeHandle@8'
main.o(.text+0x90f):main.c: undefined reference to `SQLDisconnect@4'
main.o(.text+0x92f):main.c: undefined reference to `SQLFreeHandle@8'
main.o(.text+0x94b):main.c: undefined reference to `SQLFreeHandle@8'
collect2: ld returned 1 exit status
make.exe: *** [Sample.c] Error 1
Execution terminated




Here is the code i am using

#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <odbcinst.h>
#include <sql.h>
#include <sqlext.h>
#include <sqltypes.h>

int main()
{

SQLHENV env;
SQLHDBC dbc;
SQLHSTMT stmt;
SQLRETURN ret; /* ODBC API return status */
SQLSMALLINT columns; /* number of columns in result-set */
int row = 0;
/* Allocate an environment handle */
SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &env);
/* We want ODBC 3 support */
SQLSetEnvAttr(env, SQL_ATTR_ODBC_VERSION, (void *) SQL_OV_ODBC3, 0);
/* Allocate a connection handle */
SQLAllocHandle(SQL_HANDLE_DBC, env, &dbc);
/* Connect to the DSN mydsn */
/* You will need to change mydsn to one you have created and tested */
SQLDriverConnect(dbc, NULL, "DSN=shruthiks;", SQL_NTS,
NULL, 0, NULL, SQL_DRIVER_COMPLETE);
/* Allocate a statement handle */
SQLAllocHandle(SQL_HANDLE_STMT, dbc, &stmt);
/* Retrieve a list of tables */
SQLTables(stmt, NULL, 0, NULL, 0, NULL, 0, "TABLE", SQL_NTS);
/* How many columns are there */
SQLNumResultCols(stmt, &columns);
/* Loop through the rows in the result-set */
while (SQL_SUCCEEDED(ret = SQLFetch(stmt)))
{
SQLUSMALLINT i;
printf("Row %d\n", row++);
/* Loop through the columns */
for (i = 1; i <= columns; i++)
{
SQLINTEGER indicator;
char buf[512];
/* retrieve column data as a string */
ret = SQLGetData(stmt, i, SQL_C_CHAR,
buf, sizeof(buf), &indicator);
if (SQL_SUCCEEDED(ret))
{
/* Handle null columns */
if (indicator == SQL_NULL_DATA) strcpy(buf, "NULL");
printf(" Column %u : %s\n", i, buf);
}
}
}
}


Can any one tell what could be the problem for those linker erros.

Give me a some explanation regarding this.....

looks like a missing library. you probably need to add libodbccp32.a to library list.

I added the particular library.. But still Linker error is coming..

please any one tell the correct way to solve this problem..

please explain clearly..

I just successfully linked you program using these libraries:

lib/libodbc32.a
lib/libodbccp32.a


To add then to the project, use menu Project --> Project Options --> hit the Parameters tab, then put the library names in the Linker box.