path: root/storage/connect/myconn.cpp

/************** MyConn C++ Program Source Code File (.CPP) **************/
/* PROGRAM NAME: MYCONN                                                 */
/* -------------                                                        */
/*  Version 1.9                                                         */
/*                                                                      */
/* COPYRIGHT:                                                           */
/* ----------                                                           */
/*  (C) Copyright to the author Olivier BERTRAND          2007-2017     */
/*                                                                      */
/* WHAT THIS PROGRAM DOES:                                              */
/* -----------------------                                              */
/*  Implements a connection to MySQL.                                   */
/*  It can optionally use the embedded MySQL library.                   */
/*                                                                      */
/* WHAT YOU NEED TO COMPILE THIS PROGRAM:                               */
/* --------------------------------------                               */
/*                                                                      */
/*  REQUIRED FILES:                                                     */
/*  ---------------                                                     */
/*    MYCONN.CPP     - Source code                                      */
/*    MYCONN.H       - MYCONN class declaration file                    */
/*    GLOBAL.H       - Global declaration file                          */
/*                                                                      */
/*  REQUIRED LIBRARIES:                                                 */
/*  -------------------                                                 */
/*    Large model C library                                             */
/*                                                                      */
/*  REQUIRED PROGRAMS:                                                  */
/*  ------------------                                                  */
/*    IBM, Borland, GNU or Microsoft C++ Compiler and Linker            */
/*                                                                      */
/************************************************************************/
#include "my_global.h"
#if !defined(MYSQL_PREPARED_STATEMENTS)
#include "my_sys.h"
#include "mysqld_error.h"
#endif   // !MYSQL_PREPARED_STATEMENTS
#if defined(__WIN__)
//#include <windows.h>
#else   // !__WIN__
#include "osutil.h"
#endif  // !__WIN__

#include "global.h"
#include "plgdbsem.h"
#include "plgcnx.h"                       // For DB types
#include "resource.h"
//#include "value.h"
//#include "valblk.h"
#include "xobject.h"
#define  DLL_EXPORT            // Items are exported from this DLL
#include "myconn.h"

//extern "C" int   zconv;
int GetConvSize(void);
extern MYSQL_PLUGIN_IMPORT uint  mysqld_port;
extern MYSQL_PLUGIN_IMPORT char *mysqld_unix_port;

DllExport void PushWarning(PGLOBAL, THD*, int level = 1);

// Returns the current used port
uint GetDefaultPort(void)
{
  return mysqld_port;
} // end of GetDefaultPort

#if !defined(MYSQL_PREPARED_STATEMENTS)
/**************************************************************************
  Alloc struct for use with unbuffered reads. Data is fetched by domand
  when calling to mysql_fetch_row.
  mysql_data_seek is a noop.

  No other queries may be specified with the same MYSQL handle.
  There shouldn't be much processing per row because mysql server shouldn't
  have to wait for the client (and will not wait more than 30 sec/packet).
  NOTE: copied from client.c cli_use_result
**************************************************************************/
static MYSQL_RES *connect_use_result(MYSQL *mysql)
{
  MYSQL_RES *result;
  DBUG_ENTER("connect_use_result");

  if (!mysql->fields)
    DBUG_RETURN(NULL);

  if (mysql->status != MYSQL_STATUS_GET_RESULT) {
    my_message(ER_UNKNOWN_ERROR, "Command out of sync", MYF(0));
    DBUG_RETURN(NULL);
    } // endif status

  if (!(result = (MYSQL_RES*) my_malloc(sizeof(*result) +
				          sizeof(ulong) * mysql->field_count,
				          MYF(MY_WME | MY_ZEROFILL))))
    DBUG_RETURN(NULL);

  result->lengths = (ulong*)(result+1);
  result->methods = mysql->methods;

  /* Ptrs: to one row */
  if (!(result->row = (MYSQL_ROW)my_malloc(sizeof(result->row[0]) *
                                (mysql->field_count+1), MYF(MY_WME)))) {
    my_free(result);
    DBUG_RETURN(NULL);
    }  // endif row

  result->fields =	mysql->fields;
  result->field_alloc =	mysql->field_alloc;
  result->field_count =	mysql->field_count;
  result->current_field = 0;
  result->handle =	mysql;
  result->current_row =	0;
  mysql->fields = 0;			/* fields is now in result */
  clear_alloc_root(&mysql->field_alloc);
  mysql->status = MYSQL_STATUS_USE_RESULT;
  mysql->unbuffered_fetch_owner = &result->unbuffered_fetch_cancelled;
  DBUG_RETURN(result);			/* Data is ready to be fetched */
} // end of connect_use_result
#endif   // !MYSQL_PREPARED_STATEMENTS

/************************************************************************/
/*  MyColumns: constructs the result blocks containing all columns      */
/*  of a MySQL table or view.                                           */
/*  info = TRUE to get catalog column informations.                     */
/************************************************************************/
PQRYRES MyColumns(PGLOBAL g, THD *thd, const char *host, const char *db,
                  const char *user, const char *pwd,
                  const char *table, const char *colpat,
                  int port, bool info)
  {
  int  buftyp[] = {TYPE_STRING, TYPE_SHORT,  TYPE_STRING, TYPE_INT,
                   TYPE_STRING, TYPE_SHORT,  TYPE_SHORT,  TYPE_SHORT,
                   TYPE_STRING, TYPE_STRING, TYPE_STRING, TYPE_STRING,
                   TYPE_STRING};
  XFLD fldtyp[] = {FLD_NAME, FLD_TYPE,  FLD_TYPENAME, FLD_PREC,
                   FLD_KEY,  FLD_SCALE, FLD_RADIX,    FLD_NULL,
                   FLD_REM,  FLD_NO,    FLD_DEFAULT,  FLD_EXTRA,
                   FLD_CHARSET};
  //unsigned int length[] = {0, 4, 16, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0};
	unsigned int length[] = {0, 4, 0, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0};
	PCSZ    fmt;
	char   *fld, *colname, *chset, v, buf[128], uns[16], zero[16];
  int     i, n, nf = 0, ncol = sizeof(buftyp) / sizeof(int);
  int     len, type, prec, rc, k = 0;
	bool    b;
  PQRYRES qrp;
  PCOLRES crp;
  MYSQLC  myc;

  if (!port)
    port = mysqld_port;

  if (!info) {
    /********************************************************************/
    /*  Open the connection with the MySQL server.                      */
    /********************************************************************/
    if (myc.Open(g, host, db, user, pwd, port))
      return NULL;

    /********************************************************************/
    /*  Do an evaluation of the result size.                            */
    /********************************************************************/
    STRING cmd(g, 64, "SHOW FULL COLUMNS FROM ");
		b = cmd.Append('`');
    b |= cmd.Append((PSZ)table);
		b |= cmd.Append('`');

    b |= cmd.Append(" FROM ");
    b |= cmd.Append((PSZ)(db ? db : PlgGetUser(g)->DBName));

    if (colpat) {
      b |= cmd.Append(" LIKE ");
      b |= cmd.Append((PSZ)colpat);
      } // endif colpat

    if (b) {
      strcpy(g->Message, "Out of memory");
      return NULL;
      } // endif b

    if (trace(1))
      htrc("MyColumns: cmd='%s'\n", cmd.GetStr());

    if ((n = myc.GetResultSize(g, cmd.GetStr())) < 0) {
      myc.Close();
      return NULL;
      } // endif n

    /********************************************************************/
    /*  Get the size of the name and default columns.                   */
    /********************************************************************/
    length[0] = myc.GetFieldLength(0);
//  length[10] = myc.GetFieldLength(5);
  } else {
    n = 0;
    length[0] = 128;
  } // endif info

  /**********************************************************************/
  /*  Allocate the structures used to refer to the result set.          */
  /**********************************************************************/
  if (!(qrp = PlgAllocResult(g, ncol, n, IDS_COLUMNS + 3,
                             buftyp, fldtyp, length, false, true)))
    return NULL;

  // Some columns must be renamed
  for (i = 0, crp = qrp->Colresp; crp; crp = crp->Next)
    switch (++i) {
      case  2: crp->Nulls = (char*)PlugSubAlloc(g, NULL, n); break;
      case  4: crp->Name = "Length";    break;
      case  5: crp->Name = "Key";       break;
      case 10: crp->Name = "Date_fmt";  break;
      case 11: crp->Name = "Default";   break;
      case 12: crp->Name = "Extra";     break;
      case 13: crp->Name = "Collation"; break;
      } // endswitch i

  if (info)
    return qrp;

  /**********************************************************************/
  /*  Now get the results into blocks.                                  */
  /**********************************************************************/
  for (i = 0; i < n; /*i++*/) {
    if ((rc = myc.Fetch(g, -1)) == RC_FX) {
      myc.Close();
      return NULL;
    } else if (rc == RC_EF)
      break;

    // Get column name
    colname = myc.GetCharField(0);
    crp = qrp->Colresp;                    // Column_Name
    crp->Kdata->SetValue(colname, i);

    // Get type, type name, precision, unsigned and zerofill
    chset = myc.GetCharField(2);
    fld = myc.GetCharField(1);
    prec = 0;
    len = 0;
//  v = (chset && !strcmp(chset, "binary")) ? 'B' : 0;
		v = 0;
    *uns = 0;
    *zero = 0;
		b = false;

		if (!strnicmp(fld, "enum", 4)) {
			char *p2, *p1 = fld + 6;            // to skip enum('

			while (true) {
				p2 = strchr(p1, '\'');
				len = MY_MAX(len, (int)(p2 - p1));
				if (*++p2 != ',') break;
				p1 = p2 + 2;
			} // endwhile

			v = (len > 255) ? 'V' : 0;
			strcpy(buf, "enum");
			b = true;
		} else if (!strnicmp(fld, "set", 3)) {
			len = (int)strlen(fld) - 2;
			v = 'V';
			strcpy(buf, "set");
			b = true;
		} else switch ((nf = sscanf(fld, "%[^(](%d,%d", buf, &len, &prec))) {
      case 3:
        nf = sscanf(fld, "%[^(](%d,%d) %s %s", buf, &len, &prec, uns, zero);
        break;
      case 2:
        nf = sscanf(fld, "%[^(](%d) %s %s", buf, &len, uns, zero) + 1;
        break;
      case 1:
        nf = sscanf(fld, "%s %s %s", buf, uns, zero) + 2;
        break;
      default:
        sprintf(g->Message, MSG(BAD_FIELD_TYPE), fld);
        myc.Close();
        return NULL;
      } // endswitch nf

    if ((type = MYSQLtoPLG(buf, &v)) == TYPE_ERROR) {
      if (v == 'K') {
        // Skip this column
        sprintf(g->Message, "Column %s skipped (unsupported type %s)",
                colname, buf);
        PushWarning(g, thd);
        continue;
        } // endif v

      sprintf(g->Message, "Column %s unsupported type %s", colname, buf);
      myc.Close();
      return NULL;
    } else if (type == TYPE_STRING) {
      if (v == 'X') {
        len = GetConvSize();
        sprintf(g->Message, "Column %s converted to varchar(%d)",
                colname, len);
        PushWarning(g, thd);
        v = 'V';
			} else
        len = MY_MIN(len, 4096);

    } // endif type

    qrp->Nblin++;
    crp = crp->Next;                       // Data_Type
    crp->Kdata->SetValue(type, i);

    switch (nf) {
      case 5:  crp->Nulls[i] = 'Z'; break;
      case 4:  crp->Nulls[i] = 'U'; break;
      default: crp->Nulls[i] = v;   break;
      } // endswitch nf

		if (b)																 // enum or set
  		nf = sscanf(fld, "%s ", buf);				 // get values

    crp = crp->Next;                       // Type_Name
    crp->Kdata->SetValue(buf, i);

    if (type == TYPE_DATE) {
      // When creating tables we do need info about date columns
      fmt = MyDateFmt(buf);
      len = strlen(fmt);
    } else
      fmt = NULL;

    crp = crp->Next;                       // Precision
    crp->Kdata->SetValue(len, i);

    crp = crp->Next;                       // key (was Length)
    fld = myc.GetCharField(4);
    crp->Kdata->SetValue(fld, i);

    crp = crp->Next;                       // Scale
    crp->Kdata->SetValue(prec, i);

    crp = crp->Next;                       // Radix
    crp->Kdata->SetValue(0, i);

    crp = crp->Next;                       // Nullable
    fld = myc.GetCharField(3);
    crp->Kdata->SetValue((toupper(*fld) == 'Y') ? 1 : 0, i);

    crp = crp->Next;                       // Remark
    fld = myc.GetCharField(8);
    crp->Kdata->SetValue(fld, i);

    crp = crp->Next;                       // Date format
//  crp->Kdata->SetValue((fmt) ? fmt : (char*) "", i);
    crp->Kdata->SetValue(fmt, i);

    crp = crp->Next;                       // New (default)
    fld = myc.GetCharField(5);
    crp->Kdata->SetValue(fld, i);

    crp = crp->Next;                       // New (extra)
    fld = myc.GetCharField(6);
    crp->Kdata->SetValue(fld, i);

    crp = crp->Next;                       // New (charset)
    fld = chset;
    crp->Kdata->SetValue(fld, i);

    i++;                                   // Can be skipped
    } // endfor i

#if 0
  if (k > 1) {
    // Multicolumn primary key
    PVBLK vbp = qrp->Colresp->Next->Next->Next->Next->Kdata;

    for (i = 0; i < n; i++)
      if (vbp->GetIntValue(i))
        vbp->SetValue(k, i);

    } // endif k
#endif // 0

  /**********************************************************************/
  /*  Close MySQL connection.                                           */
  /**********************************************************************/
  myc.Close();

  /**********************************************************************/
  /*  Return the result pointer for use by GetData routines.            */
  /**********************************************************************/
  return qrp;
  } // end of MyColumns

/************************************************************************/
/*  SrcColumns: constructs the result blocks containing all columns     */
/*  resulting from an SQL source definition query execution.            */
/************************************************************************/
PQRYRES SrcColumns(PGLOBAL g, const char *host, const char *db,
                   const char *user, const char *pwd,
                   const char *srcdef, int port)
  {
  char   *query;
  int     w;
  MYSQLC  myc;
  PQRYRES qrp = NULL;

  if (!port)
    port = mysqld_port;

	if (!strnicmp(srcdef, "select ", 7) || strstr(srcdef, "%s")) {
    query = (char *)PlugSubAlloc(g, NULL, strlen(srcdef) + 10);

		if (strstr(srcdef, "%s"))
			sprintf(query, srcdef, "1=1");			 // dummy where clause
		else 
		  strcpy(query, srcdef);

		if (!strnicmp(srcdef, "select ", 7))
		  strcat(query, " LIMIT 0");

	} else
    query = (char *)srcdef;

  // Open a MySQL connection for this table
  if (myc.Open(g, host, db, user, pwd, port))
    return NULL;

  // Send the source command to MySQL
  if (myc.ExecSQL(g, query, &w) == RC_OK)
    qrp = myc.GetResult(g, true);

  myc.Close();
  return qrp;
  } // end of SrcColumns

/* -------------------------- Class MYSQLC --------------------------- */

/***********************************************************************/
/*  Implementation of the MYSQLC class.                                */
/***********************************************************************/
MYSQLC::MYSQLC(void)
  {
  m_DB = NULL;
#if defined (MYSQL_PREPARED_STATEMENTS)
	m_Stmt = NULL;
#endif    // MYSQL_PREPARED_STATEMENTS
	m_Res = NULL;
  m_Rows = -1;
  m_Row = NULL;
  m_Fields = -1;
  N = 0;
  m_Use = false;
  } // end of MYSQLC constructor

/***********************************************************************/
/*  Get the number of lines of the result set.                         */
/*  Currently we send the Select command and return m_Rows             */
/*  Perhaps should we use Select count(*) ... (?????)                  */
/*  No because here we execute only one query instead of two           */
/*  (the select count(*) plus the normal query)                        */
/***********************************************************************/
int MYSQLC::GetResultSize(PGLOBAL g, PSZ sql)
  {
  if (m_Rows < 0)
    if (ExecSQL(g, sql) != RC_OK)
      return -1;

  return m_Rows;
  } // end of GetResultSize

/***********************************************************************/
/*  Open a MySQL (remote) connection.                                  */
/***********************************************************************/
int MYSQLC::Open(PGLOBAL g, const char *host, const char *db,
                            const char *user, const char *pwd,
                            int pt, const char *csname)
  {
  const char *pipe = NULL;
  uint        cto = 10, nrt = 20;
  my_bool     my_true= 1;

  m_DB = mysql_init(NULL);

  if (!m_DB) {
    strcpy(g->Message, "mysql_init failed: no memory");
    return RC_FX;
    } // endif m_DB

	if (trace(1))
		htrc("MYSQLC Open: m_DB=%.4X size=%d\n", m_DB, (int)sizeof(*m_DB));

	// Removed to do like FEDERATED do
//mysql_options(m_DB, MYSQL_READ_DEFAULT_GROUP, "client-mariadb");
  mysql_options(m_DB, MYSQL_OPT_USE_REMOTE_CONNECTION, NULL);
  mysql_options(m_DB, MYSQL_OPT_CONNECT_TIMEOUT, &cto);
  mysql_options(m_DB, MYSQL_OPT_READ_TIMEOUT, &nrt);
//mysql_options(m_DB, MYSQL_OPT_WRITE_TIMEOUT, ...);

#if defined(__WIN__)
  if (!strcmp(host, ".")) {
    mysql_options(m_DB, MYSQL_OPT_NAMED_PIPE, NULL);
    pipe = mysqld_unix_port;
    } // endif host
#else   // !__WIN__
  if (!strcmp(host, "localhost"))
    pipe = mysqld_unix_port;
#endif  // !__WIN__

#if 0
  if (pwd && !strcmp(pwd, "*")) {
    if (GetPromptAnswer(g, "*Enter password:")) {
      m_DB = NULL;
      return RC_FX;
    } else
      pwd = g->Message;

    } // endif pwd
#endif // 0

/***********************************************************************/
/*	BUG# 17044 Federated Storage Engine is not UTF8 clean              */
/*	Add set names to whatever charset the table is at open of table    */
/*  this sets the csname like 'set names utf8'.                        */
/***********************************************************************/
  if (csname)
    mysql_options(m_DB, MYSQL_SET_CHARSET_NAME, csname);

  // Don't know what this one do but FEDERATED does it
  mysql_options(m_DB, MYSQL_OPT_USE_THREAD_SPECIFIC_MEMORY,
                  (char*)&my_true);

  if (!mysql_real_connect(m_DB, host, user, pwd, db, pt, pipe,
		CLIENT_MULTI_RESULTS | CLIENT_REMEMBER_OPTIONS)) {
#if defined(_DEBUG)
    sprintf(g->Message, "mysql_real_connect failed: (%d) %s",
                        mysql_errno(m_DB), mysql_error(m_DB));
#else   // !_DEBUG
    sprintf(g->Message, "(%d) %s", mysql_errno(m_DB), mysql_error(m_DB));
#endif  // !_DEBUG
    mysql_close(m_DB);
    m_DB = NULL;
    return RC_FX;
    } // endif mysql_real_connect

  return RC_OK;
  } // end of Open

/***********************************************************************/
/*  Returns true if the connection is still alive.                     */
/***********************************************************************/
bool MYSQLC::Connected(void)
  {
//int rc;

  if (!m_DB)
    return FALSE;
//else if ((rc = mysql_ping(m_DB)) == CR_SERVER_GONE_ERROR)
//  return FALSE;
  else
    return TRUE;

  } // end of Connected

#if 0                         // Not used
/***********************************************************************/
/*  Returns the thread ID of the current MySQL connection.             */
/***********************************************************************/
ulong MYSQLC::GetThreadID(void)
  {
  return (m_DB) ? mysql_thread_id(m_DB) : 0;
  } // end of GetThreadID

/***********************************************************************/
/*  Returns a string that represents the server version number.        */
/***********************************************************************/
const char *MYSQLC::ServerInfo(void)
  {
  return (m_DB) ? mysql_get_server_info(m_DB) : NULL;
  } // end of ServerInfo

/***********************************************************************/
/*  Returns the version number of the server as a number that          */
/*  represents the MySQL server version in this format:                */
/*  major_version*10000 + minor_version *100 + sub_version             */
/***********************************************************************/
ulong MYSQLC::ServerVersion(void)
  {
  return (m_DB) ? mysql_get_server_version(m_DB) : 0;
  } // end of ServerVersion
#endif // 0

/**************************************************************************/
/*  KillQuery: Send MySQL a Kill Query command.                           */
/**************************************************************************/
int MYSQLC::KillQuery(ulong id)
  {
  char kill[20];

  sprintf(kill, "KILL QUERY %u", (unsigned int) id);
//return (m_DB) ? mysql_query(m_DB, kill) : 1;
  return (m_DB) ? mysql_real_query(m_DB, kill, strlen(kill)) : 1;
  } // end of KillQuery

#if defined (MYSQL_PREPARED_STATEMENTS)
/***********************************************************************/
/*  Prepare the SQL statement used to insert into a MySQL table.       */
/***********************************************************************/
int MYSQLC::PrepareSQL(PGLOBAL g, const char *stmt)
  {
  if (!m_DB) {
    strcpy(g->Message, "MySQL not connected");
    return -4;
  } else if (m_Stmt)
    return -1;              // should not append

#if defined(ALPHA)
  if (!(m_Stmt = mysql_prepare(m_DB, stmt, strlen(stmt)))) {

    sprintf(g->Message, "mysql_prepare failed: %s [%s]",
                         mysql_error(m_DB), stmt);
    return -1;
    } // endif m_Stmt

  // Return the parameter count from the statement
  return mysql_param_count(m_Stmt);
#else   // !ALPHA
  if (!(m_Stmt = mysql_stmt_init(m_DB))) {
    strcpy(g->Message, "mysql_stmt_init(), out of memory");
    return -2;
    } // endif m_Stmt

  if (mysql_stmt_prepare(m_Stmt, stmt, strlen(stmt))) {
    sprintf(g->Message, "mysql_stmt_prepare() failed: (%d) %s",
            mysql_stmt_errno(m_Stmt), mysql_stmt_error(m_Stmt));
    return -3;
    } // endif prepare

  // Return the parameter count from the statement
  return mysql_stmt_param_count(m_Stmt);
#endif   // !ALPHA
  } // end of PrepareSQL

/***********************************************************************/
/*  Bind the parameter buffers.                                        */
/***********************************************************************/
int MYSQLC::BindParams(PGLOBAL g, MYSQL_BIND *bind)
  {
  if (!m_DB) {
    strcpy(g->Message, "MySQL not connected");
    return RC_FX;
  } else
    assert(m_Stmt);

#if defined(ALPHA)
  if (mysql_bind_param(m_Stmt, bind)) {
    sprintf(g->Message, "mysql_bind_param() failed: %s",
                        mysql_stmt_error(m_Stmt));
#else   // !ALPHA
  if (mysql_stmt_bind_param(m_Stmt, bind)) {
    sprintf(g->Message, "mysql_stmt_bind_param() failed: %s",
                        mysql_stmt_error(m_Stmt));
#endif  // !ALPHA
    return RC_FX;
    } // endif bind

  return RC_OK;

/***********************************************************************/
/*  Execute a prepared statement.                                      */
/***********************************************************************/
int MYSQLC::ExecStmt(PGLOBAL g)
  {
  if (!m_DB) {
    strcpy(g->Message, "MySQL not connected");
    return RC_FX;
    } // endif m_DB

#if defined(ALPHA)
  if (mysql_execute(m_Stmt)) {
    sprintf(g->Message, "mysql_execute() failed: %s",
                        mysql_stmt_error(m_Stmt));
    return RC_FX;
    } // endif execute
#else   // !ALPHA
  if (mysql_stmt_execute(m_Stmt)) {
    sprintf(g->Message, "mysql_stmt_execute() failed: %s",
                        mysql_stmt_error(m_Stmt));
    return RC_FX;
    } // endif execute
#endif  // !ALPHA

  // Check the total number of affected rows
  if (mysql_stmt_affected_rows(m_Stmt) != 1) {
    sprintf(g->Message, "Invalid affected rows by MySQL");
    return RC_FX;
    } // endif affected_rows

  return RC_OK;
  } // end of ExecStmt
#endif   // MYSQL_PREPARED_STATEMENTS

/***********************************************************************/
/*  Exec the Select SQL command and get back the result size in rows.  */
/***********************************************************************/
int MYSQLC::ExecSQL(PGLOBAL g, const char *query, int *w)
  {
  int rc = RC_OK;

  if (!m_DB) {
    strcpy(g->Message, "MySQL not connected");
    return RC_FX;
    } // endif m_DB

  if (w)
    *w = 0;

  if (m_Rows >= 0)
    return RC_OK;                  // Already done

//if (mysql_query(m_DB, query) != 0) {
  if (mysql_real_query(m_DB, query, strlen(query))) {
    char *msg = (char*)PlugSubAlloc(g, NULL, 512 + strlen(query));

    sprintf(msg, "(%d) %s [%s]", mysql_errno(m_DB),
                                 mysql_error(m_DB), query);
    strncpy(g->Message, msg, sizeof(g->Message) - 1);
    g->Message[sizeof(g->Message) - 1] = 0;
    rc = RC_FX;
//} else if (mysql_field_count(m_DB) > 0) {
  } else if (m_DB->field_count > 0) {
    if (m_Use)
#if defined(MYSQL_PREPARED_STATEMENTS)
      m_Res = mysql_use_result(m_DB);
#else   // !MYSQL_PREPARED_STATEMENTS)
      m_Res = connect_use_result(m_DB);
#endif  // !MYSQL_PREPARED_STATEMENTS
    else
      m_Res = mysql_store_result(m_DB);

    if (!m_Res) {
      char *msg = (char*)PlugSubAlloc(g, NULL, 512 + strlen(query));

      sprintf(msg, "mysql_store_result failed: %s", mysql_error(m_DB));
      strncpy(g->Message, msg, sizeof(g->Message) - 1);
      g->Message[sizeof(g->Message) - 1] = 0;
      rc = RC_FX;
    } else {
      m_Fields = mysql_num_fields(m_Res);
      m_Rows = (!m_Use) ? (int)mysql_num_rows(m_Res) : 0;

			if (trace(1))
				htrc("ExecSQL: m_Res=%.4X size=%d m_Fields=%d m_Rows=%d\n",
				               m_Res, sizeof(*m_Res), m_Fields, m_Rows);

    } // endif m_Res

  } else {
//  m_Rows = (int)mysql_affected_rows(m_DB);
    m_Rows = (int)m_DB->affected_rows;
    sprintf(g->Message, "Affected rows: %d\n", m_Rows);
    rc = RC_NF;
  } // endif field count

  if (w)
//  *w = mysql_warning_count(m_DB);
    *w = m_DB->warning_count;

  return rc;
  } // end of ExecSQL

/***********************************************************************/
/*  Get table size by executing "select count(*) from table_name".     */
/***********************************************************************/
int MYSQLC::GetTableSize(PGLOBAL g __attribute__((unused)), PSZ query)
  {
  if (mysql_real_query(m_DB, query, strlen(query))) {
#if defined(_DEBUG)
    char *msg = (char*)PlugSubAlloc(g, NULL, 512 + strlen(query));

    sprintf(msg, "(%d) %s [%s]", mysql_errno(m_DB),
                                 mysql_error(m_DB), query);
    strncpy(g->Message, msg, sizeof(g->Message) - 1);
    g->Message[sizeof(g->Message) - 1] = 0;
#endif   // _DEBUG
    return -2;
    } // endif mysql_real_query

  if (!(m_Res = mysql_store_result(m_DB)))
    return -3;

  // Get the resulting count value
  m_Rows = (int)mysql_num_rows(m_Res);     // Should be 1

  if (m_Rows && (m_Row = mysql_fetch_row(m_Res)))
    return atoi(*m_Row);

  return -4;
  } // end of GetTableSize

/***********************************************************************/
/*  Move to a specific row and column                                  */
/***********************************************************************/
void MYSQLC::DataSeek(my_ulonglong row)
  {
  MYSQL_ROWS *tmp = 0;
//DBUG_PRINT("info",("mysql_data_seek(%ld)",(long) row));

  if (m_Res->data)
    for (tmp = m_Res->data->data; row-- && tmp; tmp = tmp->next) ;

  m_Res->current_row = 0;
  m_Res->data_cursor = tmp;
  } // end of DataSeek

/***********************************************************************/
/*  Fetch one result line from the query result set.                   */
/***********************************************************************/
int MYSQLC::Fetch(PGLOBAL g, int pos)
  {
  if (!m_DB) {
    strcpy(g->Message, "MySQL not connected");
    return RC_FX;
    } // endif m_DB

  if (!m_Res) {
    // Result set was not initialized
    strcpy(g->Message, MSG(FETCH_NO_RES));
    return RC_FX;
  } else
    N++;

  if (pos >= 0)
//  mysql_data_seek(m_Res, (my_ulonglong)pos);
    DataSeek((my_ulonglong)pos);

  m_Row = mysql_fetch_row(m_Res);
  return (m_Row) ? RC_OK : RC_EF;
  } // end of Fetch

/***********************************************************************/
/*  Get one field of the current row.                                  */
/***********************************************************************/
char *MYSQLC::GetCharField(int i)
  {
  if (m_Res && m_Row) {
#if defined(_DEBUG)
//  MYSQL_FIELD *fld = mysql_fetch_field_direct(m_Res, i);
#endif   // _DEBUG
    MYSQL_ROW row = m_Row + i;

    return (row) ? (char*)*row : (char*)"<null>";
  } else
    return NULL;

  } // end of GetCharField

/***********************************************************************/
/*  Get the max length of the field.                                   */
/***********************************************************************/
int MYSQLC::GetFieldLength(int i)
  {
  if (m_Res) {
//  MYSQL_FIELD *fld = mysql_fetch_field_direct(m_Res, i);
//  return fld->max_length;
    return (m_Res)->fields[i].max_length;
  } else
    return 0;

  } // end of GetFieldLength

/***********************************************************************/
/*  Return next field of the query results.                            */
/***********************************************************************/
MYSQL_FIELD *MYSQLC::GetNextField(void)
  {
  return (m_Res->current_field >= m_Res->field_count) ? NULL
       : &m_Res->fields[m_Res->current_field++];
  } // end of GetNextField

/***********************************************************************/
/*  Make a CONNECT result structure from the MySQL result.             */
/***********************************************************************/
PQRYRES MYSQLC::GetResult(PGLOBAL g, bool pdb)
  {
	PCSZ         fmt;
  char        *name, v;
  int          n;
  bool         uns;
  PCOLRES     *pcrp, crp;
  PQRYRES      qrp;
  MYSQL_FIELD *fld;
  MYSQL_ROW    row;

  if (!m_Res || !m_Fields) {
    sprintf(g->Message, "%s result", (m_Res) ? "Void" : "No");
    return NULL;
    } // endif m_Res

  /*********************************************************************/
  /*  Put the result in storage for future retrieval.                  */
  /*********************************************************************/
  qrp = (PQRYRES)PlugSubAlloc(g, NULL, sizeof(QRYRES));
  pcrp = &qrp->Colresp;
  qrp->Continued = FALSE;
  qrp->Truncated = FALSE;
  qrp->Info = FALSE;
  qrp->Suball = TRUE;
  qrp->BadLines = 0;
  qrp->Maxsize = m_Rows;
  qrp->Maxres = m_Rows;
  qrp->Nbcol = 0;
  qrp->Nblin = 0;
  qrp->Cursor = 0;

//for (fld = mysql_fetch_field(m_Res); fld;
//     fld = mysql_fetch_field(m_Res)) {
  for (fld = GetNextField(); fld; fld = GetNextField()) {
    *pcrp = (PCOLRES)PlugSubAlloc(g, NULL, sizeof(COLRES));
    crp = *pcrp;
    pcrp = &crp->Next;
    memset(crp, 0, sizeof(COLRES));
    crp->Ncol = ++qrp->Nbcol;

    name = (char*)PlugSubAlloc(g, NULL, fld->name_length + 1);
    strcpy(name, fld->name);
		crp->Name = name;

    if ((crp->Type = MYSQLtoPLG(fld->type, &v)) == TYPE_ERROR) {
      sprintf(g->Message, "Type %d not supported for column %s",
                          fld->type, crp->Name);
      return NULL;
    } else if (crp->Type == TYPE_DATE && !pdb)
      // For direct MySQL connection, display the MySQL date string
      crp->Type = TYPE_STRING;
    else
      crp->Var = v;

    crp->Prec = (crp->Type == TYPE_DOUBLE || crp->Type == TYPE_DECIM)
              ? fld->decimals : 0;
    CHARSET_INFO *cs= get_charset(fld->charsetnr, MYF(0));
    crp->Clen = GetTypeSize(crp->Type, fld->length);
    crp->Length = fld->length / (cs ? cs->mbmaxlen : 1);
    uns = (fld->flags & (UNSIGNED_FLAG | ZEROFILL_FLAG)) ? true : false;

    if (!(crp->Kdata = AllocValBlock(g, NULL, crp->Type, m_Rows,
                                     crp->Clen, 0, FALSE, TRUE, uns))) {
      sprintf(g->Message, MSG(INV_RESULT_TYPE),
                          GetFormatType(crp->Type));
      return NULL;
    } else if (crp->Type == TYPE_DATE) {
      fmt = MyDateFmt(fld->type);
      crp->Kdata->SetFormat(g, fmt, strlen(fmt));
    } // endif's

    if (fld->flags & NOT_NULL_FLAG)
      crp->Nulls = NULL;
    else {
			if (m_Rows) {
				crp->Nulls = (char*)PlugSubAlloc(g, NULL, m_Rows);
				memset(crp->Nulls, ' ', m_Rows);
			} // endif m_Rows

			crp->Kdata->SetNullable(true);
    } // endelse fld->flags

    } // endfor fld

  *pcrp = NULL;
  assert(qrp->Nbcol == m_Fields);

  /*********************************************************************/
  /*  Now fill the allocated result structure.                         */
  /*********************************************************************/
  for (n = 0; n < m_Rows; n++) {
    if (!(m_Row = mysql_fetch_row(m_Res))) {
      sprintf(g->Message, "Missing row %d from result", n + 1);
      return NULL;
      } // endif m_Row

    for (crp = qrp->Colresp; crp; crp = crp->Next) {
      if ((row = m_Row + (crp->Ncol - 1))) {
        if (*row)
          crp->Kdata->SetValue((PSZ)*row, n);
        else {
          if (!*row && crp->Nulls)
            crp->Nulls[n] = '*';           // Null value

          crp->Kdata->Reset(n);
        } // endelse *row
      }

    } // endfor crp

  } // endfor n

  qrp->Nblin = n;
  return qrp;
  } // end of GetResult

/***********************************************************************/
/*  Free the current result.                                           */
/***********************************************************************/
void MYSQLC::FreeResult(void)
  {
  if (m_Res) {
    mysql_free_result(m_Res);
    m_Res = NULL;
    } // endif m_Res

  // Reset the connection
  m_Row = NULL;
  m_Rows = -1;
  m_Fields = -1;
  N = 0;
  } // end of FreeResult

/***********************************************************************/
/*  Place the cursor at the beginning of the result set.               */
/***********************************************************************/
int MYSQLC::Rewind(PGLOBAL g, PSZ sql)
  {
		int rc = RC_OK;

		if (m_Res)
			DataSeek(0);
		else if (sql)
			rc = ExecSQL(g, sql);

		return rc;
  } // end of Rewind

/***********************************************************************/
/*  Exec the Select SQL command and return ncol or afrws (TDBMYEXC).   */
/***********************************************************************/
int MYSQLC::ExecSQLcmd(PGLOBAL g, const char *query, int *w)
  {
  int rc = RC_OK;

  if (!m_DB) {
    strcpy(g->Message, "MySQL not connected");
    return RC_FX;
  } else
    *w = 0;

  if (!stricmp(query, "Warning") || !stricmp(query, "Note")
                                 || !stricmp(query, "Error"))
    return RC_INFO;
  else
    m_Afrw = 0;

//if (mysql_query(m_DB, query) != 0) {
  if (mysql_real_query(m_DB, query, strlen(query))) {
    m_Afrw = (int)mysql_errno(m_DB);
    sprintf(g->Message, "Remote: %s", mysql_error(m_DB));
    rc = RC_FX;
//} else if (!(m_Fields = mysql_field_count(m_DB))) {
  } else if (!(m_Fields = (int)m_DB->field_count)) {
//  m_Afrw = (int)mysql_affected_rows(m_DB);
    m_Afrw = (int)m_DB->affected_rows;
    rc = RC_NF;
  } // endif's

//*w = mysql_warning_count(m_DB);
  *w = m_DB->warning_count;
  return rc;
  } // end of ExecSQLcmd

/***********************************************************************/
/*  Close the connection.                                              */
/***********************************************************************/
void MYSQLC::Close(void)
  {
  FreeResult();

	if (trace(1))
		htrc("MYSQLC Close: m_DB=%.4X\n", m_DB);

	mysql_close(m_DB);
  m_DB = NULL;
  } // end of Close

#if 0                       // not used yet
/***********************************************************************/
/*  Discard additional results from a stored procedure.                */
/***********************************************************************/
void MYSQLC::DiscardResults(void)
  {
  MYSQL_RES *res;

  while (!mysql_next_result(m_DB)) {
    res = mysql_store_result(m_DB);
    mysql_free_result(res);
    } // endwhile next result

  } // end of DiscardResults
#endif // 0