mysqlshow.c

/*
   Copyright (c) 2000, 2015, Oracle and/or its affiliates.
   Copyright (c) 2010, 2017, MariaDB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

/* Show databases, tables or columns */

#define SHOW_VERSION "9.10"

#include "client_priv.h"
#include <my_sys.h>
#include <m_string.h>
#include <mysql.h>
#include <mysqld_error.h>
#include <signal.h>
#include <stdarg.h>
#include <sslopt-vars.h>
#include <welcome_copyright_notice.h>   /* ORACLE_WELCOME_COPYRIGHT_NOTICE */

static char * host=0, *opt_password=0, *user=0;
static my_bool opt_show_keys= 0, opt_compress= 0, opt_count=0, opt_status= 0;
static my_bool tty_password= 0, opt_table_type= 0;
static my_bool debug_info_flag= 0, debug_check_flag= 0;
static uint my_end_arg= 0;
static uint opt_verbose=0;
static char *default_charset= (char*) MYSQL_AUTODETECT_CHARSET_NAME;
static char *opt_plugin_dir= 0, *opt_default_auth= 0;

static uint opt_protocol=0;

static void get_options(int *argc,char ***argv);
static uint opt_mysql_port=0;
static int list_dbs(MYSQL *mysql,const char *wild);
static int list_tables(MYSQL *mysql,const char *db,const char *table);
static int list_table_status(MYSQL *mysql,const char *db,const char *table);
static int list_fields(MYSQL *mysql,const char *db,const char *table,
		       const char *field);
static void print_header(const char *header,size_t head_length,...);
static void print_row(const char *header,size_t head_length,...);
static void print_trailer(size_t length,...);
static void print_res_header(MYSQL_RES *result);
static void print_res_top(MYSQL_RES *result);
static void print_res_row(MYSQL_RES *result,MYSQL_ROW cur);

static const char *load_default_groups[]=
{ "mysqlshow","client", "client-server", "client-mariadb", 0 };
static char * opt_mysql_unix_port=0;

int main(int argc, char **argv)
{
  int error;
  my_bool first_argument_uses_wildcards=0;
  char *wild;
  MYSQL mysql;
  my_bool reconnect;
  static char **defaults_argv;
  MY_INIT(argv[0]);
  sf_leaking_memory=1; /* don't report memory leaks on early exits */
  load_defaults_or_exit("my", load_default_groups, &argc, &argv);
  defaults_argv=argv;

  get_options(&argc,&argv);

  sf_leaking_memory=0; /* from now on we cleanup properly */
  wild=0;
  if (argc)
  {
    char *pos= argv[argc-1], *to;
    for (to= pos ; *pos ; pos++, to++)
    {
      switch (*pos) {
      case '*':
	*pos= '%';
	first_argument_uses_wildcards= 1;
	break;
      case '?':
	*pos= '_';
	first_argument_uses_wildcards= 1;
	break;
      case '%':
      case '_':
	first_argument_uses_wildcards= 1;
	break;
      case '\\':
	pos++;
      default: break;
      }
      *to= *pos;
    }    
    *to= *pos; /* just to copy a '\0'  if '\\' was used */
  }
  if (first_argument_uses_wildcards)
    wild= argv[--argc];
  else if (argc == 3)			/* We only want one field */
    wild= argv[--argc];

  if (argc > 2)
  {
    fprintf(stderr,"%s: Too many arguments\n",my_progname);
    exit(1);
  }
  mysql_init(&mysql);
  if (opt_compress)
    mysql_options(&mysql,MYSQL_OPT_COMPRESS,NullS);
#ifdef HAVE_OPENSSL
  if (opt_use_ssl)
  {
    mysql_ssl_set(&mysql, opt_ssl_key, opt_ssl_cert, opt_ssl_ca,
		  opt_ssl_capath, opt_ssl_cipher);
    mysql_options(&mysql, MYSQL_OPT_SSL_CRL, opt_ssl_crl);
    mysql_options(&mysql, MYSQL_OPT_SSL_CRLPATH, opt_ssl_crlpath);
  }
  mysql_options(&mysql,MYSQL_OPT_SSL_VERIFY_SERVER_CERT,
                (char*)&opt_ssl_verify_server_cert);
#endif
  if (opt_protocol)
    mysql_options(&mysql,MYSQL_OPT_PROTOCOL,(char*)&opt_protocol);

  mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, default_charset);

  if (opt_plugin_dir && *opt_plugin_dir)
    mysql_options(&mysql, MYSQL_PLUGIN_DIR, opt_plugin_dir);

  if (opt_default_auth && *opt_default_auth)
    mysql_options(&mysql, MYSQL_DEFAULT_AUTH, opt_default_auth);

  mysql_options(&mysql, MYSQL_OPT_CONNECT_ATTR_RESET, 0);
  mysql_options4(&mysql, MYSQL_OPT_CONNECT_ATTR_ADD,
                 "program_name", "mysqlshow");
  if (!(mysql_real_connect(&mysql,host,user,opt_password,
			   (first_argument_uses_wildcards) ? "" :
                           argv[0],opt_mysql_port,opt_mysql_unix_port,
			   0)))
  {
    fprintf(stderr,"%s: %s\n",my_progname,mysql_error(&mysql));
    error= 1;
    goto error;
  }
  reconnect= 1;
  mysql_options(&mysql, MYSQL_OPT_RECONNECT, &reconnect);

  switch (argc) {
  case 0:  error=list_dbs(&mysql,wild); break;
  case 1:
    if (opt_status)
      error=list_table_status(&mysql,argv[0],wild);
    else
      error=list_tables(&mysql,argv[0],wild);
    break;
  default:
    if (opt_status && ! wild)
      error=list_table_status(&mysql,argv[0],argv[1]);
    else
      error=list_fields(&mysql,argv[0],argv[1],wild);
    break;
  }
error:
  mysql_close(&mysql);			/* Close & free connection */
  my_free(opt_password);
  mysql_server_end();
  free_defaults(defaults_argv);
  my_end(my_end_arg);
  exit(error ? 1 : 0);
  return 0;				/* No compiler warnings */
}

static struct my_option my_long_options[] =
{
  {"character-sets-dir", 'c', "Directory for character set files.",
   (char**) &charsets_dir, (char**) &charsets_dir, 0, GET_STR, REQUIRED_ARG, 0,
   0, 0, 0, 0, 0},
  {"default-character-set", OPT_DEFAULT_CHARSET,
   "Set the default character set.", &default_charset,
   &default_charset, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
  {"count", OPT_COUNT,
   "Show number of rows per table (may be slow for non-MyISAM tables).",
   &opt_count, &opt_count, 0, GET_BOOL, NO_ARG, 0, 0, 0,
   0, 0, 0},
  {"compress", 'C', "Use compression in server/client protocol.",
   &opt_compress, &opt_compress, 0, GET_BOOL, NO_ARG, 0, 0, 0,
   0, 0, 0},
  {"debug", '#', "Output debug log. Often this is 'd:t:o,filename'.",
   0, 0, 0, GET_STR, OPT_ARG, 0, 0, 0, 0, 0, 0},
  {"debug-check", OPT_DEBUG_CHECK, "Check memory and open file usage at exit.",
   &debug_check_flag, &debug_check_flag, 0,
   GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"debug-info", OPT_DEBUG_INFO, "Print some debug info at exit.",
   &debug_info_flag, &debug_info_flag,
   0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"default_auth", OPT_DEFAULT_AUTH,
   "Default authentication client-side plugin to use.",
   &opt_default_auth, &opt_default_auth, 0,
   GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
  {"help", '?', "Display this help and exit.", 0, 0, 0, GET_NO_ARG, NO_ARG,
   0, 0, 0, 0, 0, 0},
  {"host", 'h', "Connect to host.", &host, &host, 0, GET_STR,
   REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
  {"status", 'i', "Shows a lot of extra information about each table.",
   &opt_status, &opt_status, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0,
   0, 0},
  {"keys", 'k', "Show keys for table.", &opt_show_keys,
   &opt_show_keys, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"password", 'p',
   "Password to use when connecting to server. If password is not given, it's "
   "solicited on the tty.",
   0, 0, 0, GET_STR, OPT_ARG, 0, 0, 0, 0, 0, 0},
  {"plugin_dir", OPT_PLUGIN_DIR, "Directory for client-side plugins.",
   &opt_plugin_dir, &opt_plugin_dir, 0,
   GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
  {"port", 'P', "Port number to use for connection or 0 for default to, in "
   "order of preference, my.cnf, $MYSQL_TCP_PORT, "
#if MYSQL_PORT_DEFAULT == 0
   "/etc/services, "
#endif
   "built-in default (" STRINGIFY_ARG(MYSQL_PORT) ").",
   &opt_mysql_port,
   &opt_mysql_port, 0, GET_UINT, REQUIRED_ARG, 0, 0, 0, 0, 0,
   0},
#ifdef __WIN__
  {"pipe", 'W', "Use named pipes to connect to server.", 0, 0, 0, GET_NO_ARG,
   NO_ARG, 0, 0, 0, 0, 0, 0},
#endif
  {"protocol", OPT_MYSQL_PROTOCOL, 
   "The protocol to use for connection (tcp, socket, pipe).",
   0, 0, 0, GET_STR,  REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
  {"show-table-type", 't', "Show table type column.",
   &opt_table_type, &opt_table_type, 0, GET_BOOL,
   NO_ARG, 0, 0, 0, 0, 0, 0},
  {"socket", 'S', "The socket file to use for connection.",
   &opt_mysql_unix_port, &opt_mysql_unix_port, 0, GET_STR,
   REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
#include <sslopt-longopts.h>
#ifndef DONT_ALLOW_USER_CHANGE
  {"user", 'u', "User for login if not current user.", &user,
   &user, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
#endif
  {"verbose", 'v',
   "More verbose output; you can use this multiple times to get even more "
   "verbose output.",
   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"version", 'V', "Output version information and exit.", 0, 0, 0, GET_NO_ARG,
   NO_ARG, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}
};


static void print_version(void)
{
  printf("%s  Ver %s Distrib %s, for %s (%s)\n",my_progname,SHOW_VERSION,
	 MYSQL_SERVER_VERSION,SYSTEM_TYPE,MACHINE_TYPE);
}


static void usage(void)
{
  print_version();
  puts(ORACLE_WELCOME_COPYRIGHT_NOTICE("2000"));
  puts("Shows the structure of a MariaDB database (databases, tables, and columns).\n");
  printf("Usage: %s [OPTIONS] [database [table [column]]]\n",my_progname);
  puts("\n\
If last argument contains a shell or SQL wildcard (*,?,% or _) then only\n\
what\'s matched by the wildcard is shown.\n\
If no database is given then all matching databases are shown.\n\
If no table is given, then all matching tables in database are shown.\n\
If no column is given, then all matching columns and column types in table\n\
are shown.");
  print_defaults("my",load_default_groups);
  puts("");
  my_print_help(my_long_options);
  my_print_variables(my_long_options);
}


static my_bool
get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
	       char *argument)
{
  switch(optid) {
  case 'v':
    opt_verbose++;
    break;
  case 'p':
    if (argument == disabled_my_option)
      argument= (char*) "";			/* Don't require password */
    if (argument)
    {
      char *start=argument;
      my_free(opt_password);
      opt_password=my_strdup(argument,MYF(MY_FAE));
      while (*argument) *argument++= 'x';		/* Destroy argument */
      if (*start)
	start[1]=0;				/* Cut length of argument */
      tty_password= 0;
    }
    else
      tty_password=1;
    break;
  case 'W':
#ifdef __WIN__
    opt_protocol = MYSQL_PROTOCOL_PIPE;
#endif
    break;
  case OPT_MYSQL_PROTOCOL:
    if ((opt_protocol= find_type_with_warning(argument, &sql_protocol_typelib,
                                              opt->name)) <= 0)
    {
      sf_leaking_memory= 1; /* no memory leak reports here */
      exit(1);
    }
    break;
  case '#':
    DBUG_PUSH(argument ? argument : "d:t:o");
    debug_check_flag= 1;
    break;
#include <sslopt-case.h>
  case 'V':
    print_version();
    exit(0);
    break;
  case '?':
  case 'I':					/* Info */
    usage();
    exit(0);
  }
  return 0;
}


static void
get_options(int *argc,char ***argv)
{
  int ho_error;

  if ((ho_error=handle_options(argc, argv, my_long_options, get_one_option)))
    exit(ho_error);
  
  if (tty_password)
    opt_password=get_tty_password(NullS);
  if (opt_count)
  {
    /*
      We need to set verbose to 2 as we need to change the output to include
      the number-of-rows column
    */
    opt_verbose= 2;
  }
  if (debug_info_flag)
    my_end_arg= MY_CHECK_ERROR | MY_GIVE_INFO;
  if (debug_check_flag)
    my_end_arg= MY_CHECK_ERROR;
  return;
}


static int
list_dbs(MYSQL *mysql,const char *wild)
{
  const char *header;
  size_t length = 0;
  uint counter = 0;
  ulong rowcount = 0L;
  char tables[NAME_LEN+1], rows[NAME_LEN+1];
  char query[NAME_LEN + 100];
  MYSQL_FIELD *field;
  MYSQL_RES *result;
  MYSQL_ROW row= NULL, rrow;

  if (!(result=mysql_list_dbs(mysql,wild)))
  {
    fprintf(stderr,"%s: Cannot list databases: %s\n",my_progname,
	    mysql_error(mysql));
    return 1;
  }

  /*
    If a wildcard was used, but there was only one row and it's name is an
    exact match, we'll assume they really wanted to see the contents of that
    database. This is because it is fairly common for database names to
    contain the underscore (_), like INFORMATION_SCHEMA.
   */
  if (wild && mysql_num_rows(result) == 1)
  {
    row= mysql_fetch_row(result);
    if (!my_strcasecmp(&my_charset_latin1, row[0], wild))
    {
      mysql_free_result(result);
      if (opt_status)
        return list_table_status(mysql, wild, NULL);
      else
        return list_tables(mysql, wild, NULL);
    }
  }

  if (wild)
    printf("Wildcard: %s\n",wild);

  header="Databases";
  length= strlen(header);
  field=mysql_fetch_field(result);
  if (length < field->max_length)
    length=field->max_length;

  if (!opt_verbose)
    print_header(header,length,NullS);
  else if (opt_verbose == 1)
    print_header(header,length,"Tables",6,NullS);
  else
    print_header(header,length,"Tables",6,"Total Rows",12,NullS);

  /* The first row may have already been read up above. */
  while (row || (row= mysql_fetch_row(result)))
  {
    counter++;

    if (opt_verbose)
    {
      if (!(mysql_select_db(mysql,row[0])))
      {
	MYSQL_RES *tresult = mysql_list_tables(mysql,(char*)NULL);
	if (mysql_affected_rows(mysql) > 0)
	{
	  sprintf(tables,"%6lu",(ulong) mysql_affected_rows(mysql));
	  rowcount = 0;
	  if (opt_verbose > 1)
	  {
            /* Print the count of tables and rows for each database */
            MYSQL_ROW trow;
	    while ((trow = mysql_fetch_row(tresult)))
	    {
              my_snprintf(query, sizeof(query),
                          "SELECT COUNT(*) FROM `%s`", trow[0]);
	      if (!(mysql_query(mysql,query)))
	      {
		MYSQL_RES *rresult;
		if ((rresult = mysql_store_result(mysql)))
		{
		  rrow = mysql_fetch_row(rresult);
		  rowcount += (ulong) strtoull(rrow[0], (char**) 0, 10);
		  mysql_free_result(rresult);
		}
	      }
	    }
	    sprintf(rows,"%12lu",rowcount);
	  }
	}
	else
	{
	  sprintf(tables,"%6d",0);
	  sprintf(rows,"%12d",0);
	}
	mysql_free_result(tresult);
      }
      else
      {
	strmov(tables,"N/A");
	strmov(rows,"N/A");
      }
    }

    if (!opt_verbose)
      print_row(row[0],length,0);
    else if (opt_verbose == 1)
      print_row(row[0],length,tables,6,NullS);
    else
      print_row(row[0],length,tables,6,rows,12,NullS);

    row= NULL;
  }

  print_trailer(length,
		(opt_verbose > 0 ? 6 : 0),
		(opt_verbose > 1 ? 12 :0),
		0);

  if (counter && opt_verbose)
    printf("%u row%s in set.\n",counter,(counter > 1) ? "s" : "");
  mysql_free_result(result);
  return 0;
}


static int
list_tables(MYSQL *mysql,const char *db,const char *table)
{
  const char *header;
  size_t head_length;
  uint counter = 0;
  char query[NAME_LEN + 100], rows[NAME_LEN], fields[16];
  MYSQL_FIELD *field;
  MYSQL_RES *result;
  MYSQL_ROW row, rrow;

  if (mysql_select_db(mysql,db))
  {
    fprintf(stderr,"%s: Cannot connect to db %s: %s\n",my_progname,db,
	    mysql_error(mysql));
    return 1;
  }
  if (table)
  {
    /*
      We just hijack the 'rows' variable for a bit to store the escaped
      table name
    */
    mysql_real_escape_string(mysql, rows, table, (unsigned long)strlen(table));
    my_snprintf(query, sizeof(query), "show%s tables like '%s'",
                opt_table_type ? " full" : "", rows);
  }
  else
    my_snprintf(query, sizeof(query), "show%s tables",
                opt_table_type ? " full" : "");
  if (mysql_query(mysql, query) || !(result= mysql_store_result(mysql)))
  {
    fprintf(stderr,"%s: Cannot list tables in %s: %s\n",my_progname,db,
	    mysql_error(mysql));
    exit(1);
  }
  printf("Database: %s",db);
  if (table)
    printf("  Wildcard: %s",table);
  putchar('\n');

  header="Tables";
  head_length= strlen(header);
  field=mysql_fetch_field(result);
  if (head_length < field->max_length)
    head_length=field->max_length;

  if (opt_table_type)
  {
    if (!opt_verbose)
      print_header(header,head_length,"table_type",10,NullS);
    else if (opt_verbose == 1)
      print_header(header,head_length,"table_type",10,"Columns",8,NullS);
    else
    {
      print_header(header,head_length,"table_type",10,"Columns",8,
		   "Total Rows",10,NullS);
    }
  }
  else
  {
    if (!opt_verbose)
      print_header(header,head_length,NullS);
    else if (opt_verbose == 1)
      print_header(header,head_length,"Columns",8,NullS);
    else
      print_header(header,head_length,"Columns",8, "Total Rows",10,NullS);
  }

  while ((row = mysql_fetch_row(result)))
  {
    counter++;
    if (opt_verbose > 0)
    {
      if (!(mysql_select_db(mysql,db)))
      {
	MYSQL_RES *rresult = mysql_list_fields(mysql,row[0],NULL);
	ulong rowcount=0L;
	if (!rresult)
	{
	  strmov(fields,"N/A");
	  strmov(rows,"N/A");
	}
	else
	{
	  sprintf(fields,"%8u",(uint) mysql_num_fields(rresult));
	  mysql_free_result(rresult);

	  if (opt_verbose > 1)
	  {
            /* Print the count of rows for each table */
            my_snprintf(query, sizeof(query), "SELECT COUNT(*) FROM `%s`",
                        row[0]);
	    if (!(mysql_query(mysql,query)))
	    {
	      if ((rresult = mysql_store_result(mysql)))
	      {
		rrow = mysql_fetch_row(rresult);
		rowcount += (unsigned long) strtoull(rrow[0], (char**) 0, 10);
		mysql_free_result(rresult);
	      }
	      sprintf(rows,"%10lu",rowcount);
	    }
	    else
	      sprintf(rows,"%10d",0);
	  }
	}
      }
      else
      {
	strmov(fields,"N/A");
	strmov(rows,"N/A");
      }
    }
    if (opt_table_type)
    {
      if (!opt_verbose)
	print_row(row[0],head_length,row[1],10,NullS);
      else if (opt_verbose == 1)
	print_row(row[0],head_length,row[1],10,fields,8,NullS);
      else
	print_row(row[0],head_length,row[1],10,fields,8,rows,10,NullS);
    }
    else
    {
      if (!opt_verbose)
	print_row(row[0],head_length,NullS);
      else if (opt_verbose == 1)
	print_row(row[0],head_length, fields,8, NullS);
      else
	print_row(row[0],head_length, fields,8, rows,10, NullS);
    }
  }

  print_trailer(head_length,
		(opt_table_type ? 10 : opt_verbose > 0 ? 8 : 0),
		(opt_table_type ? (opt_verbose > 0 ? 8 : 0) 
		 : (opt_verbose > 1 ? 10 :0)),
		!opt_table_type ? 0 : opt_verbose > 1 ? 10 :0,
		0);

  if (counter && opt_verbose)
    printf("%u row%s in set.\n\n",counter,(counter > 1) ? "s" : "");

  mysql_free_result(result);
  return 0;
}


static int
list_table_status(MYSQL *mysql,const char *db,const char *wild)
{
  char query[NAME_LEN + 100];
  size_t len;
  MYSQL_RES *result;
  MYSQL_ROW row;

  len= sizeof(query);
  len-= my_snprintf(query, len, "show table status from `%s`", db);
  if (wild && wild[0] && len)
    strxnmov(query + strlen(query), len - 1, " like '", wild, "'", NullS);
  if (mysql_query(mysql,query) || !(result=mysql_store_result(mysql)))
  {
    fprintf(stderr,"%s: Cannot get status for db: %s, table: %s: %s\n",
	    my_progname,db,wild ? wild : "",mysql_error(mysql));
    if (mysql_errno(mysql) == ER_PARSE_ERROR)
      fprintf(stderr,"This error probably means that your MariaDB server doesn't support the\n\'show table status' command.\n");
    return 1;
  }

  printf("Database: %s",db);
  if (wild)
    printf("  Wildcard: %s",wild);
  putchar('\n');

  print_res_header(result);
  while ((row=mysql_fetch_row(result)))
    print_res_row(result,row);
  print_res_top(result);
  mysql_free_result(result);
  return 0;
}

/*
  list fields uses field interface as an example of how to parse
  a MYSQL FIELD
*/

static int
list_fields(MYSQL *mysql,const char *db,const char *table,
	    const char *wild)
{
  char query[NAME_LEN + 100];
  size_t len;
  MYSQL_RES *result;
  MYSQL_ROW row;
  ulong UNINIT_VAR(rows);

  if (mysql_select_db(mysql,db))
  {
    fprintf(stderr,"%s: Cannot connect to db: %s: %s\n",my_progname,db,
	    mysql_error(mysql));
    return 1;
  }

  if (opt_count)
  {
    my_snprintf(query, sizeof(query), "select count(*) from `%s`", table);
    if (mysql_query(mysql,query) || !(result=mysql_store_result(mysql)))
    {
      fprintf(stderr,"%s: Cannot get record count for db: %s, table: %s: %s\n",
              my_progname,db,table,mysql_error(mysql));
      return 1;
    }
    row= mysql_fetch_row(result);
    rows= (ulong) strtoull(row[0], (char**) 0, 10);
    mysql_free_result(result);
  }

  len= sizeof(query);
  len-= my_snprintf(query, len, "show /*!32332 FULL */ columns from `%s`",
                    table);
  if (wild && wild[0] && len)
    strxnmov(query + strlen(query), len - 1, " like '", wild, "'", NullS);
  if (mysql_query(mysql,query) || !(result=mysql_store_result(mysql)))
  {
    fprintf(stderr,"%s: Cannot list columns in db: %s, table: %s: %s\n",
	    my_progname,db,table,mysql_error(mysql));
    return 1;
  }

  printf("Database: %s  Table: %s", db, table);
  if (opt_count)
    printf("  Rows: %lu", rows);
  if (wild && wild[0])
    printf("  Wildcard: %s",wild);
  putchar('\n');

  print_res_header(result);
  while ((row=mysql_fetch_row(result)))
    print_res_row(result,row);
  print_res_top(result);
  if (opt_show_keys)
  {
    my_snprintf(query, sizeof(query), "show keys from `%s`", table);
    if (mysql_query(mysql,query) || !(result=mysql_store_result(mysql)))
    {
      fprintf(stderr,"%s: Cannot list keys in db: %s, table: %s: %s\n",
	      my_progname,db,table,mysql_error(mysql));
      return 1;
    }
    if (mysql_num_rows(result))
    {
      print_res_header(result);
      while ((row=mysql_fetch_row(result)))
	print_res_row(result,row);
      print_res_top(result);
    }
    else
      puts("Table has no keys");
  }
  mysql_free_result(result);
  return 0;
}


/*****************************************************************************
 General functions to print a nice ascii-table from data
*****************************************************************************/

static void
print_header(const char *header,size_t head_length,...)
{
  va_list args;
  size_t length,i,str_length,pre_space;
  const char *field;

  va_start(args,head_length);
  putchar('+');
  field=header; length=head_length;
  for (;;)
  {
    for (i=0 ; i < length+2 ; i++)
      putchar('-');
    putchar('+');
    if (!(field=va_arg(args,char *)))
      break;
    length=va_arg(args,uint);
  }
  va_end(args);
  putchar('\n');

  va_start(args,head_length);
  field=header; length=head_length;
  putchar('|');
  for (;;)
  {
    str_length= strlen(field);
    if (str_length > length)
      str_length=length+1;
    pre_space= ((length- str_length)/2)+1;
    for (i=0 ; i < pre_space ; i++)
      putchar(' ');
    for (i = 0 ; i < str_length ; i++)
      putchar(field[i]);
    length=length+2-str_length-pre_space;
    for (i=0 ; i < length ; i++)
      putchar(' ');
    putchar('|');
    if (!(field=va_arg(args,char *)))
      break;
    length=va_arg(args,uint);
  }
  va_end(args);
  putchar('\n');

  va_start(args,head_length);
  putchar('+');
  field=header; length=head_length;
  for (;;)
  {
    for (i=0 ; i < length+2 ; i++)
      putchar('-');
    putchar('+');
    if (!(field=va_arg(args,char *)))
      break;
    length=va_arg(args,uint);
  }
  va_end(args);
  putchar('\n');
}


static void
print_row(const char *header,size_t head_length,...)
{
  va_list args;
  const char *field;
  size_t i,length,field_length;

  va_start(args,head_length);
  field=header; length=head_length;
  for (;;)
  {
    putchar('|');
    putchar(' ');
    fputs(field,stdout);
    field_length= strlen(field);
    for (i=field_length ; i <= length ; i++)
      putchar(' ');
    if (!(field=va_arg(args,char *)))
      break;
    length=va_arg(args,uint);
  }
  va_end(args);
  putchar('|');
  putchar('\n');
}


static void
print_trailer(size_t head_length,...)
{
  va_list args;
  size_t length,i;

  va_start(args,head_length);
  length=head_length;
  putchar('+');
  for (;;)
  {
    for (i=0 ; i < length+2 ; i++)
      putchar('-');
    putchar('+');
    if (!(length=va_arg(args,uint)))
      break;
  }
  va_end(args);
  putchar('\n');
}


static void print_res_header(MYSQL_RES *result)
{
  MYSQL_FIELD *field;

  print_res_top(result);
  mysql_field_seek(result,0);
  putchar('|');
  while ((field = mysql_fetch_field(result)))
  {
    printf(" %-*s|",(int) field->max_length+1,field->name);
  }
  putchar('\n');
  print_res_top(result);
}


static void print_res_top(MYSQL_RES *result)
{
  size_t i,length;
  MYSQL_FIELD *field;

  putchar('+');
  mysql_field_seek(result,0);
  while((field = mysql_fetch_field(result)))
  {
    if ((length= strlen(field->name)) > field->max_length)
      field->max_length=(ulong)length;
    else
      length=field->max_length;
    for (i=length+2 ; i--> 0 ; )
      putchar('-');
    putchar('+');
  }
  putchar('\n');
}


static void print_res_row(MYSQL_RES *result,MYSQL_ROW cur)
{
  uint i,length;
  MYSQL_FIELD *field;
  putchar('|');
  mysql_field_seek(result,0);
  for (i=0 ; i < mysql_num_fields(result); i++)
  {
    field = mysql_fetch_field(result);
    length=field->max_length;
    printf(" %-*s|",length+1,cur[i] ? (char*) cur[i] : "");
  }
  putchar('\n');
}