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Differences Between: [Versions 310 and 403] [Versions 311 and 403] [Versions 39 and 403] [Versions 400 and 403] [Versions 401 and 403] [Versions 402 and 403]

   1  <?php
   2  /**
   3   * Data Dictionary for PostgreSQL.
   4   *
   5   * This file is part of ADOdb, a Database Abstraction Layer library for PHP.
   6   *
   7   * @package ADOdb
   8   * @link https://adodb.org Project's web site and documentation
   9   * @link https://github.com/ADOdb/ADOdb Source code and issue tracker
  10   *
  11   * The ADOdb Library is dual-licensed, released under both the BSD 3-Clause
  12   * and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,
  13   * any later version. This means you can use it in proprietary products.
  14   * See the LICENSE.md file distributed with this source code for details.
  15   * @license BSD-3-Clause
  16   * @license LGPL-2.1-or-later
  17   *
  18   * @copyright 2000-2013 John Lim
  19   * @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community
  20   */
  21  
  22  // security - hide paths
  23  if (!defined('ADODB_DIR')) die();
  24  
  25  class ADODB2_postgres extends ADODB_DataDict
  26  {
  27  	 var $databaseType = 'postgres';
  28  	 var $seqField = false;
  29  	 var $seqPrefix = 'SEQ_';
  30  	 var $addCol = ' ADD COLUMN';
  31  	 var $quote = '"';
  32  	 var $renameTable = 'ALTER TABLE %s RENAME TO %s'; // at least since 7.1
  33  	 var $dropTable = 'DROP TABLE %s CASCADE';
  34  
  35  	 public $blobAllowsDefaultValue = true;
  36  	 public $blobAllowsNotNull = true;
  37  
  38  	function metaType($t, $len=-1, $fieldobj=false)
  39  	 {
  40  	 	 if (is_object($t)) {
  41  	 	 	 $fieldobj = $t;
  42  	 	 	 $t = $fieldobj->type;
  43  	 	 	 $len = $fieldobj->max_length;
  44  	 	 }
  45  
  46  	 	 $t = strtoupper($t);
  47  
  48  	 	 if (array_key_exists($t,$this->connection->customActualTypes))
  49  	 	 	 return  $this->connection->customActualTypes[$t];
  50  
  51  	 	 $is_serial = is_object($fieldobj) && !empty($fieldobj->primary_key) && !empty($fieldobj->unique) &&
  52  	 	 	 !empty($fieldobj->has_default) && substr($fieldobj->default_value,0,8) == 'nextval(';
  53  
  54  	 	 switch ($t) {
  55  
  56  	 	 	 case 'INTERVAL':
  57  	 	 	 case 'CHAR':
  58  	 	 	 case 'CHARACTER':
  59  	 	 	 case 'VARCHAR':
  60  	 	 	 case 'NAME':
  61  	 	 	 case 'BPCHAR':
  62  	 	 	 	 if ($len <= $this->blobSize) return 'C';
  63  
  64  	 	 	 case 'TEXT':
  65  	 	 	 	 return 'X';
  66  
  67  	 	 	 case 'IMAGE': // user defined type
  68  	 	 	 case 'BLOB': // user defined type
  69  	 	 	 case 'BIT':	 // This is a bit string, not a single bit, so don't return 'L'
  70  	 	 	 case 'VARBIT':
  71  	 	 	 case 'BYTEA':
  72  	 	 	 	 return 'B';
  73  
  74  	 	 	 case 'BOOL':
  75  	 	 	 case 'BOOLEAN':
  76  	 	 	 	 return 'L';
  77  
  78  	 	 	 case 'DATE':
  79  	 	 	 	 return 'D';
  80  
  81  	 	 	 case 'TIME':
  82  	 	 	 case 'DATETIME':
  83  	 	 	 case 'TIMESTAMP':
  84  	 	 	 case 'TIMESTAMPTZ':
  85  	 	 	 	 return 'T';
  86  
  87  	 	 	 case 'INTEGER': return !$is_serial ? 'I' : 'R';
  88  	 	 	 case 'SMALLINT':
  89  	 	 	 case 'INT2': return !$is_serial ? 'I2' : 'R';
  90  	 	 	 case 'INT4': return !$is_serial ? 'I4' : 'R';
  91  	 	 	 case 'BIGINT':
  92  	 	 	 case 'INT8': return !$is_serial ? 'I8' : 'R';
  93  
  94  	 	 	 case 'OID':
  95  	 	 	 case 'SERIAL':
  96  	 	 	 	 return 'R';
  97  
  98  	 	 	 case 'FLOAT4':
  99  	 	 	 case 'FLOAT8':
 100  	 	 	 case 'DOUBLE PRECISION':
 101  	 	 	 case 'REAL':
 102  	 	 	 	 return 'F';
 103  
 104  	 	 	 default:
 105  	 	 	 	 return ADODB_DEFAULT_METATYPE;
 106  	 	 }
 107  	 }
 108  
 109  	function actualType($meta)
 110  	 {
 111  	 	 $meta = strtoupper($meta);
 112  
 113  	 	 /*
 114  	 	 * Add support for custom meta types. We do this
 115  	 	 * first, that allows us to override existing types
 116  	 	 */
 117  	 	 if (isset($this->connection->customMetaTypes[$meta]))
 118  	 	 	 return $this->connection->customMetaTypes[$meta]['actual'];
 119  
 120  	 	 switch ($meta) {
 121  	 	 case 'C': return 'VARCHAR';
 122  	 	 case 'XL':
 123  	 	 case 'X': return 'TEXT';
 124  
 125  	 	 case 'C2': return 'VARCHAR';
 126  	 	 case 'X2': return 'TEXT';
 127  
 128  	 	 case 'B': return 'BYTEA';
 129  
 130  	 	 case 'D': return 'DATE';
 131  	 	 case 'TS':
 132  	 	 case 'T': return 'TIMESTAMP';
 133  
 134  	 	 case 'L': return 'BOOLEAN';
 135  	 	 case 'I': return 'INTEGER';
 136  	 	 case 'I1': return 'SMALLINT';
 137  	 	 case 'I2': return 'INT2';
 138  	 	 case 'I4': return 'INT4';
 139  	 	 case 'I8': return 'INT8';
 140  
 141  	 	 case 'F': return 'FLOAT8';
 142  	 	 case 'N': return 'NUMERIC';
 143  	 	 default:
 144  	 	 	 return $meta;
 145  	 	 }
 146  	 }
 147  
 148  	 /**
 149  	  * Adding a new Column
 150  	  *
 151  	  * reimplementation of the default function as postgres does NOT allow to set the default in the same statement
 152  	  *
 153  	  * @param string $tabname table-name
 154  	  * @param string $flds column-names and types for the changed columns
 155  	  * @return array with SQL strings
 156  	  */
 157  	function addColumnSQL($tabname, $flds)
 158  	 {
 159  	 	 $tabname = $this->tableName($tabname);
 160  	 	 $sql = array();
 161  	 	 $not_null = false;
 162  	 	 list($lines,$pkey) = $this->_genFields($flds);
 163  	 	 $alter = 'ALTER TABLE ' . $tabname . $this->addCol;
 164  	 	 $alter .= (float)@$this->serverInfo['version'] < 9.6 ? ' ' : ' IF NOT EXISTS ';
 165  	 	 foreach($lines as $v) {
 166  	 	 	 if (($not_null = preg_match('/NOT NULL/i',$v))) {
 167  	 	 	 	 $v = preg_replace('/NOT NULL/i','',$v);
 168  	 	 	 }
 169  	 	 	 if (preg_match('/^([^ ]+) .*DEFAULT (\'[^\']+\'|\"[^\"]+\"|[^ ]+)/',$v,$matches)) {
 170  	 	 	 	 list(,$colname,$default) = $matches;
 171  	 	 	 	 $sql[] = $alter . str_replace('DEFAULT '.$default,'',$v);
 172  	 	 	 	 $sql[] = 'UPDATE '.$tabname.' SET '.$colname.'='.$default.' WHERE '.$colname.' IS NULL ';
 173  	 	 	 	 $sql[] = 'ALTER TABLE '.$tabname.' ALTER COLUMN '.$colname.' SET DEFAULT ' . $default;
 174  	 	 	 } else {
 175  	 	 	 	 $sql[] = $alter . $v;
 176  	 	 	 }
 177  	 	 	 if ($not_null) {
 178  	 	 	 	 list($colname) = explode(' ',$v);
 179  	 	 	 	 $sql[] = 'ALTER TABLE '.$tabname.' ALTER COLUMN '.$colname.' SET NOT NULL';
 180  	 	 	 }
 181  	 	 }
 182  	 	 return $sql;
 183  	 }
 184  
 185  
 186  	function dropIndexSQL($idxname, $tabname = NULL)
 187  	 {
 188  	 	 return array(sprintf($this->dropIndex, $this->tableName($idxname), $this->tableName($tabname)));
 189  	 }
 190  
 191  	 /**
 192  	  * Change the definition of one column
 193  	  *
 194  	  * Postgres can't do that on its own, you need to supply the complete
 195  	  * definition of the new table, to allow recreating the table and copying
 196  	  * the content over to the new table.
 197  	  *
 198  	  * @param string $tabname      table-name
 199  	  * @param string $flds         column-name and type for the changed column
 200  	  * @param string $tableflds    complete definition of the new table, e.g. for postgres, default ''
 201  	  * @param array  $tableoptions options for the new table {@see CreateTableSQL()}, default ''
 202  	  *
 203  	  * @return array with SQL strings
 204  	  */
 205  	function alterColumnSQL($tabname, $flds, $tableflds='', $tableoptions='')
 206  	 {
 207  	 	 // Check if alter single column datatype available - works with 8.0+
 208  	 	 $has_alter_column = 8.0 <= (float) @$this->serverInfo['version'];
 209  
 210  	 	 if ($has_alter_column) {
 211  	 	 	 $tabname = $this->tableName($tabname);
 212  	 	 	 $sql = array();
 213  	 	 	 list($lines,$pkey) = $this->_genFields($flds);
 214  	 	 	 $set_null = false;
 215  	 	 	 foreach($lines as $v) {
 216  	 	 	 	 $alter = 'ALTER TABLE ' . $tabname . $this->alterCol . ' ';
 217  	 	 	 	 if ($not_null = preg_match('/NOT NULL/i',$v)) {
 218  	 	 	 	 	 $v = preg_replace('/NOT NULL/i','',$v);
 219  	 	 	 	 }
 220  	 	 	 	 // this next block doesn't work - there is no way that I can see to
 221  	 	 	 	 // explicitly ask a column to be null using $flds
 222  	 	 	 	 elseif ($set_null = preg_match('/NULL/i',$v)) {
 223  	 	 	 	 	 // if they didn't specify not null, see if they explicitly asked for null
 224  	 	 	 	 	 // Lookbehind pattern covers the case 'fieldname NULL datatype DEFAULT NULL'
 225  	 	 	 	 	 // only the first NULL should be removed, not the one specifying
 226  	 	 	 	 	 // the default value
 227  	 	 	 	 	 $v = preg_replace('/(?<!DEFAULT)\sNULL/i','',$v);
 228  	 	 	 	 }
 229  
 230  	 	 	 	 if (preg_match('/^([^ ]+) .*DEFAULT (\'[^\']+\'|\"[^\"]+\"|[^ ]+)/',$v,$matches)) {
 231  	 	 	 	 	 $existing = $this->metaColumns($tabname);
 232  	 	 	 	 	 list(,$colname,$default) = $matches;
 233  	 	 	 	 	 $alter .= $colname;
 234  	 	 	 	 	 if ($this->connection) {
 235  	 	 	 	 	 	 $old_coltype = $this->connection->metaType($existing[strtoupper($colname)]);
 236  	 	 	 	 	 } else {
 237  	 	 	 	 	 	 $old_coltype = $t;
 238  	 	 	 	 	 }
 239  	 	 	 	 	 $v = preg_replace('/^' . preg_quote($colname) . '\s/', '', $v);
 240  	 	 	 	 	 $t = trim(str_replace('DEFAULT '.$default,'',$v));
 241  
 242  	 	 	 	 	 // Type change from bool to int
 243  	 	 	 	 	 if ( $old_coltype == 'L' && $t == 'INTEGER' ) {
 244  	 	 	 	 	 	 $sql[] = $alter . ' DROP DEFAULT';
 245  	 	 	 	 	 	 $sql[] = $alter . " TYPE $t USING ($colname::BOOL)::INT";
 246  	 	 	 	 	 	 $sql[] = $alter . " SET DEFAULT $default";
 247  	 	 	 	 	 }
 248  	 	 	 	 	 // Type change from int to bool
 249  	 	 	 	 	 else if ( $old_coltype == 'I' && $t == 'BOOLEAN' ) {
 250  	 	 	 	 	 	 if( strcasecmp('NULL', trim($default)) != 0 ) {
 251  	 	 	 	 	 	 	 $default = $this->connection->qstr($default);
 252  	 	 	 	 	 	 }
 253  	 	 	 	 	 	 $sql[] = $alter . ' DROP DEFAULT';
 254  	 	 	 	 	 	 $sql[] = $alter . " TYPE $t USING CASE WHEN $colname = 0 THEN false ELSE true END";
 255  	 	 	 	 	 	 $sql[] = $alter . " SET DEFAULT $default";
 256  	 	 	 	 	 }
 257  	 	 	 	 	 // Any other column types conversion
 258  	 	 	 	 	 else {
 259  	 	 	 	 	 	 $sql[] = $alter . " TYPE $t";
 260  	 	 	 	 	 	 $sql[] = $alter . " SET DEFAULT $default";
 261  	 	 	 	 	 }
 262  
 263  	 	 	 	 }
 264  	 	 	 	 else {
 265  	 	 	 	 	 // drop default?
 266  	 	 	 	 	 preg_match ('/^\s*(\S+)\s+(.*)$/',$v,$matches);
 267  	 	 	 	 	 list (,$colname,$rest) = $matches;
 268  	 	 	 	 	 $alter .= $colname;
 269  	 	 	 	 	 $sql[] = $alter . ' TYPE ' . $rest;
 270  	 	 	 	 }
 271  
 272  	 	 	 	 #list($colname) = explode(' ',$v);
 273  	 	 	 	 if ($not_null) {
 274  	 	 	 	 	 // this does not error out if the column is already not null
 275  	 	 	 	 	 $sql[] = $alter . ' SET NOT NULL';
 276  	 	 	 	 }
 277  	 	 	 	 if ($set_null) {
 278  	 	 	 	 	 // this does not error out if the column is already null
 279  	 	 	 	 	 $sql[] = $alter . ' DROP NOT NULL';
 280  	 	 	 	 }
 281  	 	 	 }
 282  	 	 	 return $sql;
 283  	 	 }
 284  
 285  	 	 // does not have alter column
 286  	 	 if (!$tableflds) {
 287  	 	 	 if ($this->debug) ADOConnection::outp("AlterColumnSQL needs a complete table-definiton for PostgreSQL");
 288  	 	 	 return array();
 289  	 	 }
 290  	 	 return $this->_recreate_copy_table($tabname, false, $tableflds,$tableoptions);
 291  	 }
 292  
 293  	 /**
 294  	  * Drop one column
 295  	  *
 296  	  * Postgres < 7.3 can't do that on it's own, you need to supply the complete definition of the new table,
 297  	  * to allow, recreating the table and copying the content over to the new table
 298  	  * @param string $tabname table-name
 299  	  * @param string $flds column-name and type for the changed column
 300  	  * @param string $tableflds complete definition of the new table, eg. for postgres, default ''
 301  	  * @param array  $tableoptions options for the new table {@see CreateTableSQL}, default []
 302  	  * @return array with SQL strings
 303  	  */
 304  	function dropColumnSQL($tabname, $flds, $tableflds='', $tableoptions='')
 305  	 {
 306  	 	 $has_drop_column = 7.3 <= (float) @$this->serverInfo['version'];
 307  	 	 if (!$has_drop_column && !$tableflds) {
 308  	 	 	 if ($this->debug) {
 309  	 	 	 	 ADOConnection::outp("dropColumnSQL needs complete table-definiton for PostgreSQL < 7.3");
 310  	 	 	 }
 311  	 	 	 return array();
 312  	 	 }
 313  	 	 if ($has_drop_column) {
 314  	 	 	 return ADODB_DataDict::dropColumnSQL($tabname, $flds);
 315  	 	 }
 316  	 	 return $this->_recreate_copy_table($tabname, $flds, $tableflds, $tableoptions);
 317  	 }
 318  
 319  	 /**
 320  	  * Save the content into a temp. table, drop and recreate the original table and copy the content back in
 321  	  *
 322  	  * We also take care to set the values of the sequenz and recreate the indexes.
 323  	  * All this is done in a transaction, to not loose the content of the table, if something went wrong!
 324  	  * @internal
 325  	  * @param string $tabname table-name
 326  	  * @param string $dropflds column-names to drop
 327  	  * @param string $tableflds complete definition of the new table, eg. for postgres
 328  	  * @param array|string $tableoptions options for the new table see CreateTableSQL, default ''
 329  	  * @return array with SQL strings
 330  	  */
 331  	function _recreate_copy_table($tabname, $dropflds, $tableflds, $tableoptions='')
 332  	 {
 333  	 	 if ($dropflds && !is_array($dropflds)) $dropflds = explode(',',$dropflds);
 334  	 	 $copyflds = array();
 335  	 	 foreach($this->metaColumns($tabname) as $fld) {
 336  	 	 	 if (preg_match('/'.$fld->name.' (\w+)/i', $tableflds, $matches)) {
 337  	 	 	 	 $new_type = strtoupper($matches[1]);
 338  	 	 	 	 // AlterColumn of a char column to a nummeric one needs an explicit conversation
 339  	 	 	 	 if (in_array($new_type, array('I', 'I2', 'I4', 'I8', 'N', 'F')) &&
 340  	 	 	 	 	 in_array($fld->type, array('varchar','char','text','bytea'))
 341  	 	 	 	 ) {
 342  	 	 	 	 	 $copyflds[] = "to_number($fld->name,'S9999999999999D99')";
 343  	 	 	 	 } else {
 344  	 	 	 	 	 // other column-type changes needs explicit decode, encode for bytea or cast otherwise
 345  	 	 	 	 	 $new_actual_type = $this->actualType($new_type);
 346  	 	 	 	 	 if (strtoupper($fld->type) != $new_actual_type) {
 347  	 	 	 	 	 	 if ($new_actual_type == 'BYTEA' && $fld->type == 'text') {
 348  	 	 	 	 	 	 	 $copyflds[] = "DECODE($fld->name, 'escape')";
 349  	 	 	 	 	 	 } elseif ($fld->type == 'bytea' && $new_actual_type == 'TEXT') {
 350  	 	 	 	 	 	 	 $copyflds[] = "ENCODE($fld->name, 'escape')";
 351  	 	 	 	 	 	 } else {
 352  	 	 	 	 	 	 	 $copyflds[] = "CAST($fld->name AS $new_actual_type)";
 353  	 	 	 	 	 	 }
 354  	 	 	 	 	 }
 355  	 	 	 	 }
 356  	 	 	 } else {
 357  	 	 	 	 $copyflds[] = $fld->name;
 358  	 	 	 }
 359  	 	 	 // identify the sequence name and the fld its on
 360  	 	 	 if ($fld->primary_key && $fld->has_default &&
 361  	 	 	 	 preg_match("/nextval\('([^']+)'::(text|regclass)\)/", $fld->default_value, $matches)) {
 362  	 	 	 	 $seq_name = $matches[1];
 363  	 	 	 	 $seq_fld = $fld->name;
 364  	 	 	 }
 365  	 	 }
 366  	 	 $copyflds = implode(', ', $copyflds);
 367  
 368  	 	 $tempname = $tabname.'_tmp';
 369  	 	 $aSql[] = 'BEGIN';	 	 // we use a transaction, to make sure not to loose the content of the table
 370  	 	 $aSql[] = "SELECT * INTO TEMPORARY TABLE $tempname FROM $tabname";
 371  	 	 $aSql = array_merge($aSql,$this->dropTableSQL($tabname));
 372  	 	 $aSql = array_merge($aSql,$this->createTableSQL($tabname, $tableflds, $tableoptions));
 373  	 	 $aSql[] = "INSERT INTO $tabname SELECT $copyflds FROM $tempname";
 374  	 	 if ($seq_name && $seq_fld) {	 // if we have a sequence we need to set it again
 375  	 	 	 $seq_name = $tabname.'_'.$seq_fld.'_seq';	 // has to be the name of the new implicit sequence
 376  	 	 	 $aSql[] = "SELECT setval('$seq_name', MAX($seq_fld)) FROM $tabname";
 377  	 	 }
 378  	 	 $aSql[] = "DROP TABLE $tempname";
 379  	 	 // recreate the indexes, if they not contain one of the dropped columns
 380  	 	 foreach($this->metaIndexes($tabname) as $idx_name => $idx_data) {
 381  	 	 	 if (substr($idx_name,-5) != '_pkey' && (!$dropflds || !count(array_intersect($dropflds,$idx_data['columns'])))) {
 382  	 	 	 	 $aSql = array_merge($aSql,$this->createIndexSQL($idx_name, $tabname, $idx_data['columns'],
 383  	 	 	 	 	 $idx_data['unique'] ? array('UNIQUE') : false));
 384  	 	 	 }
 385  	 	 }
 386  	 	 $aSql[] = 'COMMIT';
 387  	 	 return $aSql;
 388  	 }
 389  
 390  	function dropTableSQL($tabname)
 391  	 {
 392  	 	 $sql = ADODB_DataDict::dropTableSQL($tabname);
 393  
 394  	 	 $drop_seq = $this->_dropAutoIncrement($tabname);
 395  	 	 if ($drop_seq) {
 396  	 	 	 $sql[] = $drop_seq;
 397  	 	 }
 398  	 	 return $sql;
 399  	 }
 400  
 401  	 // return string must begin with space
 402  	function _createSuffix($fname, &$ftype, $fnotnull, $fdefault, $fautoinc, $fconstraint, $funsigned)
 403  	 {
 404  	 	 if ($fautoinc) {
 405  	 	 	 $ftype = 'SERIAL';
 406  	 	 	 return '';
 407  	 	 }
 408  	 	 $suffix = '';
 409  	 	 if (strlen($fdefault)) $suffix .= " DEFAULT $fdefault";
 410  	 	 if ($fnotnull) $suffix .= ' NOT NULL';
 411  	 	 if ($fconstraint) $suffix .= ' '.$fconstraint;
 412  	 	 return $suffix;
 413  	 }
 414  
 415  	 // search for a sequence for the given table (asumes the seqence-name contains the table-name!)
 416  	 // if yes return sql to drop it
 417  	 // this is still necessary if postgres < 7.3 or the SERIAL was created on an earlier version!!!
 418  	function _dropAutoIncrement($tabname)
 419  	 {
 420  	 	 $tabname = $this->connection->quote('%'.$tabname.'%');
 421  
 422  	 	 $seq = $this->connection->getOne("SELECT relname FROM pg_class WHERE NOT relname ~ 'pg_.*' AND relname LIKE $tabname AND relkind='S'");
 423  
 424  	 	 // check if a tables depends on the sequence and it therefore can't and don't need to be dropped separately
 425  	 	 if (!$seq || $this->connection->getOne("SELECT relname FROM pg_class JOIN pg_depend ON pg_class.relfilenode=pg_depend.objid WHERE relname='$seq' AND relkind='S' AND deptype='i'")) {
 426  	 	 	 return false;
 427  	 	 }
 428  	 	 return "DROP SEQUENCE ".$seq;
 429  	 }
 430  
 431  	function renameTableSQL($tabname, $newname)
 432  	 {
 433  	 	 if (!empty($this->schema)) {
 434  	 	 	 $rename_from = $this->tableName($tabname);
 435  	 	 	 $schema_save = $this->schema;
 436  	 	 	 $this->schema = false;
 437  	 	 	 $rename_to = $this->tableName($newname);
 438  	 	 	 $this->schema = $schema_save;
 439  	 	 	 return array (sprintf($this->renameTable, $rename_from, $rename_to));
 440  	 	 }
 441  
 442  	 	 return array (sprintf($this->renameTable, $this->tableName($tabname), $this->tableName($newname)));
 443  	 }
 444  
 445  	 /*
 446  	 CREATE [ [ LOCAL ] { TEMPORARY | TEMP } ] TABLE table_name (
 447  	 { column_name data_type [ DEFAULT default_expr ] [ column_constraint [, ... ] ]
 448  	 | table_constraint } [, ... ]
 449  	 )
 450  	 [ INHERITS ( parent_table [, ... ] ) ]
 451  	 [ WITH OIDS | WITHOUT OIDS ]
 452  	 where column_constraint is:
 453  	 [ CONSTRAINT constraint_name ]
 454  	 { NOT NULL | NULL | UNIQUE | PRIMARY KEY |
 455  	 CHECK (expression) |
 456  	 REFERENCES reftable [ ( refcolumn ) ] [ MATCH FULL | MATCH PARTIAL ]
 457  	 [ ON DELETE action ] [ ON UPDATE action ] }
 458  	 [ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]
 459  	 and table_constraint is:
 460  	 [ CONSTRAINT constraint_name ]
 461  	 { UNIQUE ( column_name [, ... ] ) |
 462  	 PRIMARY KEY ( column_name [, ... ] ) |
 463  	 CHECK ( expression ) |
 464  	 FOREIGN KEY ( column_name [, ... ] ) REFERENCES reftable [ ( refcolumn [, ... ] ) ]
 465  	 [ MATCH FULL | MATCH PARTIAL ] [ ON DELETE action ] [ ON UPDATE action ] }
 466  	 [ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]
 467  	 */
 468  
 469  
 470  	 /*
 471  	 CREATE [ UNIQUE ] INDEX index_name ON table
 472  [ USING acc_method ] ( column [ ops_name ] [, ...] )
 473  [ WHERE predicate ]
 474  CREATE [ UNIQUE ] INDEX index_name ON table
 475  [ USING acc_method ] ( func_name( column [, ... ]) [ ops_name ] )
 476  [ WHERE predicate ]
 477  	 */
 478  	function _indexSQL($idxname, $tabname, $flds, $idxoptions)
 479  	 {
 480  	 	 $sql = array();
 481  
 482  	 	 if ( isset($idxoptions['REPLACE']) || isset($idxoptions['DROP']) ) {
 483  	 	 	 $sql[] = sprintf ($this->dropIndex, $idxname, $tabname);
 484  	 	 	 if ( isset($idxoptions['DROP']) ) {
 485  	 	 	 	 return $sql;
 486  	 	 	 }
 487  	 	 }
 488  
 489  	 	 if (empty($flds)) {
 490  	 	 	 return $sql;
 491  	 	 }
 492  
 493  	 	 $unique = isset($idxoptions['UNIQUE']) ? ' UNIQUE' : '';
 494  
 495  	 	 $s = 'CREATE' . $unique . ' INDEX ' . $idxname . ' ON ' . $tabname . ' ';
 496  
 497  	 	 if (isset($idxoptions['HASH'])) {
 498  	 	 	 $s .= 'USING HASH ';
 499  	 	 }
 500  
 501  	 	 if (isset($idxoptions[$this->upperName])) {
 502  	 	 	 $s .= $idxoptions[$this->upperName];
 503  	 	 }
 504  
 505  	 	 if (is_array($flds)) {
 506  	 	 	 $flds = implode(', ', $flds);
 507  	 	 }
 508  	 	 $s .= '(' . $flds . ')';
 509  	 	 $sql[] = $s;
 510  
 511  	 	 return $sql;
 512  	 }
 513  
 514  	function _getSize($ftype, $ty, $fsize, $fprec, $options=false)
 515  	 {
 516  	 	 if (strlen($fsize) && $ty != 'X' && $ty != 'B' && $ty  != 'I' && strpos($ftype,'(') === false) {
 517  	 	 	 $ftype .= "(".$fsize;
 518  	 	 	 if (strlen($fprec)) $ftype .= ",".$fprec;
 519  	 	 	 $ftype .= ')';
 520  	 	 }
 521  
 522  	 	 /*
 523  	 	 * Handle additional options
 524  	 	 */
 525  	 	 if (is_array($options)) {
 526  	 	 	 foreach($options as $type=>$value) {
 527  	 	 	 	 switch ($type) {
 528  	 	 	 	 	 case 'ENUM':
 529  	 	 	 	 	 	 $ftype .= '(' . $value . ')';
 530  	 	 	 	 	 	 break;
 531  	 	 	 	 	 default:
 532  	 	 	 	 }
 533  	 	 	 }
 534  	 	 }
 535  	 	 return $ftype;
 536  	 }
 537  
 538  	function changeTableSQL($tablename, $flds, $tableoptions = false, $dropOldFlds=false)
 539  	 {
 540  	 	 global $ADODB_FETCH_MODE;
 541  	 	 parent::changeTableSQL($tablename, $flds);
 542  	 	 $save = $ADODB_FETCH_MODE;
 543  	 	 $ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;
 544  	 	 if ($this->connection->fetchMode !== false) {
 545  	 	 	 $savem = $this->connection->setFetchMode(false);
 546  	 	 }
 547  
 548  	 	 // check table exists
 549  	 	 $save_handler = $this->connection->raiseErrorFn;
 550  	 	 $this->connection->raiseErrorFn = '';
 551  	 	 $cols = $this->metaColumns($tablename);
 552  	 	 $this->connection->raiseErrorFn = $save_handler;
 553  
 554  	 	 if (isset($savem)) {
 555  	 	 	 $this->connection->setFetchMode($savem);
 556  	 	 }
 557  	 	 $ADODB_FETCH_MODE = $save;
 558  
 559  	 	 $sqlResult=array();
 560  	 	 if ( empty($cols)) {
 561  	 	 	 $sqlResult=$this->createTableSQL($tablename, $flds, $tableoptions);
 562  	 	 } else {
 563  	 	 	 $sqlResultAdd = $this->addColumnSQL($tablename, $flds);
 564  	 	 	 $sqlResultAlter = $this->alterColumnSQL($tablename, $flds, '', $tableoptions);
 565  	 	 	 $sqlResult = array_merge((array)$sqlResultAdd, (array)$sqlResultAlter);
 566  
 567  	 	 	 if ($dropOldFlds) {
 568  	 	 	 	 // already exists, alter table instead
 569  	 	 	 	 list($lines,$pkey,$idxs) = $this->_genFields($flds);
 570  	 	 	 	 // genfields can return FALSE at times
 571  	 	 	 	 if ($lines == null) {
 572  	 	 	 	 	 $lines = array();
 573  	 	 	 	 }
 574  	 	 	 	 $alter = 'ALTER TABLE ' . $this->tableName($tablename);
 575  	 	 	 	 foreach ( $cols as $id => $v ) {
 576  	 	 	 	 	 if ( !isset($lines[$id]) ) {
 577  	 	 	 	 	 	 $sqlResult[] = $alter . $this->dropCol . ' ' . $v->name;
 578  	 	 	 	 	 }
 579  	 	 	 	 }
 580  	 	 	 }
 581  
 582  	 	 }
 583  	 	 return $sqlResult;
 584  	 }
 585  } // end class