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   example code for the ldb database library

   Copyright (C) Brad Hards (bradh@frogmouth.net) 2005-2006

     ** NOTE! The following LGPL license applies to the ldb
     ** library. This does NOT imply that all of Samba is released
     ** under the LGPL
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, see <http://www.gnu.org/licenses/>.

/** \example ldbreader.c

The code below shows a simple LDB application.

It lists / dumps the records in a LDB database to standard output.


#include "includes.h"
#include "ldb/include/ldb.h"
#include "ldb/include/ldb_errors.h"

  ldb_ldif_write takes a function pointer to a custom output
  function. This version is about as simple as the output function can
  be. In a more complex example, you'd likely be doing something with
  the private data function (e.g. holding a file handle).
static int vprintf_fn(void *private_data, const char *fmt, ...)
      int retval;
      va_list ap;

      va_start(ap, fmt);
      /* We just write to standard output */
      retval = vprintf(fmt, ap);
      /* Note that the function should return the number of 
         bytes written, or a negative error code */
      return retval;
int main(int argc, const char **argv)
      struct ldb_context *ldb;
      const char *expression = "(dn=*)";
      struct ldb_result *resultMsg;
      int i;

        This is the always the first thing you want to do in an LDB
        application - initialise up the context structure.

        Note that you can use the context structure as a parent
        for talloc allocations as well
      ldb = ldb_init(NULL);

        We now open the database. In this example we just hard code the connection path.

        Also note that the database is being opened read-only. This means that the 
        call will fail unless the database already exists. 
      if (LDB_SUCCESS != ldb_connect(ldb, "tdb://tdbtest.ldb", LDB_FLG_RDONLY, NULL) ){
            printf("Problem on connection\n");

        At this stage we have an open database, and can start using it. It is opened
        read-only, so a query is possible. 

        We construct a search that just returns all the (sensible) contents. You can do
        quite fine grained results with the LDAP search syntax, however it is a bit
        confusing to start with. See RFC2254.
      if (LDB_SUCCESS != ldb_search(ldb, NULL, LDB_SCOPE_DEFAULT,
                              expression, NULL, &resultMsg) ) {
            printf("Problem in search\n");
      printf("%i records returned\n", resultMsg->count);

        We can now iterate through the results, writing them out
        (to standard output) with our custom output routine as defined
        at the top of this file
      for (i = 0; i < resultMsg->count; ++i) {
            struct ldb_ldif ldifMsg;

            printf("Message: %i\n", i+1);
            ldifMsg.changetype = LDB_CHANGETYPE_NONE;
            ldifMsg.msg = resultMsg->msgs[i];
            ldb_ldif_write(ldb, vprintf_fn, NULL, &ldifMsg);

        There are two objects to clean up - the result from the 
        ldb_search() query, and the original ldb context.


      return 0;

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