public function createTable($name, $columns)
{
- $uniques = array();
- $primary = array();
- $indices = array();
+ $statements = $this->buildCreateTable($tableName, $def);
+ return $this->runSqlSet($statements);
+ }
- $sql = "CREATE TABLE $name (\n";
+ /**
+ * Build a set of SQL statements to create a table with the given
+ * name and columns.
+ *
+ * @param string $name Name of the table
+ * @param array $def Table definition array
+ *
+ * @return boolean success flag
+ */
+ public function buildCreateTable($name, $def)
+ {
+ $sql = array();
- for ($i = 0; $i < count($columns); $i++) {
+ foreach ($def['fields'] as $col => $colDef) {
+ $this->appendColumnDef($sql, $col, $colDef);
+ }
- $cd =& $columns[$i];
+ // Primary and unique keys are constraints, so go within
+ // the CREATE TABLE statement normally.
+ if (!empty($def['primary key'])) {
+ $this->appendPrimaryKeyDef($sql, $def['primary key']);
+ }
- if ($i > 0) {
- $sql .= ",\n";
+ if (!empty($def['unique keys'])) {
+ foreach ($def['unique keys'] as $col => $colDef) {
+ $this->appendUniqueKeyDef($sql, $col, $colDef);
}
+ }
- $sql .= $this->_columnSql($cd);
-
- switch ($cd->key) {
- case 'UNI':
- $uniques[] = $cd->name;
- break;
- case 'PRI':
- $primary[] = $cd->name;
- break;
- case 'MUL':
- $indices[] = $cd->name;
- break;
+ // Multi-value indexes are advisory and for best portability
+ // should be created as separate statements.
+ $statements = array();
+ $statements[] = $this->startCreateTable($name, $def) . "\n" .
+ implode($sql, ",\n") . "\n" .
+ $this->endCreateTable($name, $def);
+ if (!empty($def['indexes'])) {
+ foreach ($def['indexes'] as $col => $colDef) {
+ $this->appendCreateIndex($statements, $name, $col, $colDef);
}
}
- if (count($primary) > 0) { // it really should be...
- $sql .= ",\nconstraint primary key (" . implode(',', $primary) . ")";
- }
+ return $statements;
+ }
- foreach ($uniques as $u) {
- $sql .= ",\nunique index {$name}_{$u}_idx ($u)";
- }
+ /**
+ * Set up a 'create table' SQL statement.
+ *
+ * @param string $name table name
+ * @param array $def table definition
+ * @param $string
+ */
+ function startCreateTable($name, array $def)
+ {
+ return 'CREATE TABLE ' . $this->quoteIdentifier($name) . ' (';
+ }
- foreach ($indices as $i) {
- $sql .= ",\nindex {$name}_{$i}_idx ($i)";
- }
+ /**
+ * Close out a 'create table' SQL statement.
+ *
+ * @param string $name table name
+ * @param array $def table definition
+ * @return string
+ */
+ function endCreateTable($name, array $def)
+ {
+ return ')';
+ }
- $sql .= "); ";
+ /**
+ * Append an SQL fragment with a column definition in a CREATE TABLE statement.
+ *
+ * @param array $sql
+ * @param string $name
+ * @param array $def
+ */
+ function appendColumnDef(array &$sql, $name, array $def)
+ {
+ $sql[] = "$name " . $this->columnSql($def);
+ }
- $res = $this->conn->query($sql);
+ /**
+ * Append an SQL fragment with a constraint definition for a primary
+ * key in a CREATE TABLE statement.
+ *
+ * @param array $sql
+ * @param array $def
+ */
+ function appendPrimaryKeyDef(array &$sql, array $def)
+ {
+ $sql[] = "PRIMARY KEY " . $this->buildIndexList($def);
+ }
- if (PEAR::isError($res)) {
- throw new Exception($res->getMessage());
- }
+ /**
+ * Append an SQL fragment with a constraint definition for a primary
+ * key in a CREATE TABLE statement.
+ *
+ * @param array $sql
+ * @param string $name
+ * @param array $def
+ */
+ function appendUniqueKeyDef(array &$sql, $name, array $def)
+ {
+ $sql[] = "UNIQUE $key " . $this->buildIndexList($def);
+ }
- return true;
+ /**
+ * Append an SQL statement with an index definition for an advisory
+ * index over one or more columns on a table.
+ *
+ * @param array $statements
+ * @param string $table
+ * @param string $name
+ * @param array $def
+ */
+ function appendCreateIndex(array &$statements, $table, $name, array $def)
+ {
+ $statements[] = "CREATE INDEX $name ON $table " . $this->buildIndexList($def);
+ }
+
+ function buildIndexList(array $def)
+ {
+ // @fixme
+ return '(' . implode(',', array_map(array($this, 'quoteIdentifier'), $def)) . ')';
}
/**
* alter the table to match the column definitions.
*
* @param string $tableName name of the table
- * @param array $columns array of ColumnDef
- * objects for the table
+ * @param array $def Table definition array
*
* @return boolean success flag
*/
- public function ensureTable($tableName, $columns)
+ public function ensureTable($tableName, $def)
{
- // XXX: DB engine portability -> toilet
+ $statements = $this->buildEnsureTable($tableName, $def);
+ return $this->runSqlSet($statements);
+ }
+
+ /**
+ * Run a given set of SQL commands on the connection in sequence.
+ * Empty input is ok.
+ *
+ * @fixme if multiple statements, wrap in a transaction?
+ * @param array $statements
+ * @return boolean success flag
+ */
+ function runSqlSet(array $statements)
+ {
+ $ok = true;
+ foreach ($statements as $sql) {
+ $res = $this->conn->query($sql);
+
+ if (PEAR::isError($res)) {
+ throw new Exception($res->getMessage());
+ }
+ }
+ return $ok;
+ }
+
+ /**
+ * Check a table's status, and if needed build a set
+ * of SQL statements which change it to be consistent
+ * with the given table definition.
+ *
+ * If the table does not yet exist, statements will
+ * be returned to create the table. If it does exist,
+ * statements will be returned to alter the table to
+ * match the column definitions.
+ *
+ * @param string $tableName name of the table
+ * @param array $columns array of ColumnDef
+ * objects for the table
+ *
+ * @return array of SQL statements
+ */
+ function buildEnsureTable($tableName, $def)
+ {
try {
- $td = $this->getTableDef($tableName);
+ $old = $this->getTableDef($tableName);
} catch (Exception $e) {
+ // @fixme this is a terrible check :D
if (preg_match('/no such table/', $e->getMessage())) {
- return $this->createTable($tableName, $columns);
+ return $this->buildCreateTable($tableName, $def);
} else {
throw $e;
}
}
- $cur = $this->_names($td->columns);
- $new = $this->_names($columns);
+ $cur = array_keys($old['fields']);
+ $new = array_keys($def['fields']);
$toadd = array_diff($new, $cur);
$todrop = array_diff($cur, $new);
$same = array_intersect($new, $cur);
$tomod = array();
- foreach ($same as $m) {
- $curCol = $this->_byName($td->columns, $m);
- $newCol = $this->_byName($columns, $m);
+ // Find which fields have actually changed definition
+ // in a way that we need to tweak them for this DB type.
+ foreach ($same as $name) {
+ $curCol = $old['fields'][$name];
+ $newCol = $cur['fields'][$name];
- if (!$newCol->equals($curCol)) {
- $tomod[] = $newCol->name;
+ if (!$this->columnsEqual($curCol, $newCol)) {
+ $tomod[] = $name;
}
}
$phrase = array();
foreach ($toadd as $columnName) {
- $cd = $this->_byName($columns, $columnName);
-
- $phrase[] = 'ADD COLUMN ' . $this->_columnSql($cd);
+ $this->appendAlterAddColumn($phrase, $columnName,
+ $def['fields'][$columnName]);
}
foreach ($todrop as $columnName) {
- $phrase[] = 'DROP COLUMN ' . $columnName;
+ $this->appendAlterModifyColumn($phrase, $columnName,
+ $old['fields'][$columnName],
+ $def['fields'][$columnName]);
}
foreach ($tomod as $columnName) {
- $cd = $this->_byName($columns, $columnName);
-
- $phrase[] = 'MODIFY COLUMN ' . $this->_columnSql($cd);
+ $this->appendAlterDropColumn($phrase, $columnName);
}
$sql = 'ALTER TABLE ' . $tableName . ' ' . implode(', ', $phrase);
return true;
}
+ /**
+ * Append phrase(s) to an array of partial ALTER TABLE chunks in order
+ * to add the given column definition to the table.
+ *
+ * @param array $phrase
+ * @param string $columnName
+ * @param array $cd
+ */
+ function appendAlterAddColumn(array &$phrase, $columnName, array $cd)
+ {
+ $phrase[] = 'ADD COLUMN ' .
+ $this->quoteIdentifier($columnName) .
+ ' ' .
+ $this->columnSql($cd);
+ }
+
+ /**
+ * Append phrase(s) to an array of partial ALTER TABLE chunks in order
+ * to alter the given column from its old state to a new one.
+ *
+ * @param array $phrase
+ * @param string $columnName
+ * @param array $old previous column definition as found in DB
+ * @param array $cd current column definition
+ */
+ function appendAlterModifyColumn(array &$phrase, $columnName, array $old, array $cd)
+ {
+ $phrase[] = 'MODIFY COLUMN ' .
+ $this->quoteIdentifier($columnName) .
+ ' ' .
+ $this->columnSql($cd);
+ }
+
+ /**
+ * Append phrase(s) to an array of partial ALTER TABLE chunks in order
+ * to drop the given column definition from the table.
+ *
+ * @param array $phrase
+ * @param string $columnName
+ */
+ function appendAlterDropColumn(array &$phrase, $columnName)
+ {
+ $phrase[] = 'DROP COLUMN ' . $this->quoteIdentifier($columnName);
+ }
+
+ /**
+ * Quote a db/table/column identifier if necessary.
+ *
+ * @param string $name
+ * @return string
+ */
+ function quoteIdentifier($name)
+ {
+ return $name;
+ }
+
+ function quoteDefaultValue($cd)
+ {
+ if ($cd['type'] == 'datetime' && $cd['default'] == 'CURRENT_TIMESTAMP') {
+ return $cd['default'];
+ } else {
+ return $this->quoteValue($cd['default']);
+ }
+ }
+
+ function quoteValue($val)
+ {
+ if (is_int($val) || is_float($val) || is_double($val)) {
+ return strval($val);
+ } else {
+ return '"' . $this->conn->escapeSimple($val) . '"';
+ }
+ }
+
+ /**
+ * Check if two column definitions are equivalent.
+ * The default implementation checks _everything_ but in many cases
+ * you may be able to discard a bunch of equivalencies.
+ *
+ * @param array $a
+ * @param array $b
+ * @return boolean
+ */
+ function columnsEqual(array $a, array $b)
+ {
+ return !array_diff_assoc($a, $b) && !array_diff_assoc($b, $a);
+ }
+
/**
* Returns the array of names from an array of
* ColumnDef objects.
function columnSql(array $cd)
{
$line = array();
- $line[] = $this->typeAndSize();
+ $line[] = $this->typeAndSize($cd);
if (isset($cd['default'])) {
$line[] = 'default';
- $line[] = $this->quoted($cd['default']);
+ $line[] = $this->quoteDefaultValue($cd);
} else if (!empty($cd['not null'])) {
// Can't have both not null AND default!
$line[] = 'not null';
}
}
+ /**
+ * Map a native type back to an independent type + size
+ *
+ * @param string $type
+ * @return array ($type, $size) -- $size may be null
+ */
+ protected function reverseMapType($type)
+ {
+ return array($type, null);
+ }
+
/**
* Convert an old-style set of ColumnDef objects into the current
* Drupal-style schema definition array, for backwards compatibility
return $table;
}
+
+ function isNumericType($type)
+ {
+ $type = strtolower($type);
+ $known = array('int', 'serial', 'numeric');
+ return in_array($type, $known);
+ }
+
+ /**
+ * Pull info from the query into a fun-fun array of dooooom
+ *
+ * @param string $sql
+ * @return array of arrays
+ */
+ protected function fetchQueryData($sql)
+ {
+ $res = $this->conn->query($sql);
+ if (PEAR::isError($res)) {
+ throw new Exception($res->getMessage());
+ }
+
+ $out = array();
+ $row = array();
+ while ($res->fetchInto($row, DB_FETCHMODE_ASSOC)) {
+ $out[] = $row;
+ }
+ $res->free();
+
+ return $out;
+ }
+
}
class SchemaTableMissingException extends Exception
projects / quix0rs-gnu-social.git / blobdiff