public $sequence_name = 'INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL'; //Particular name for inline sequences in this generator
public $unsigned_allowed = false; // To define in the generator must handle unsigned information
+ public $enum_inline_code = true; //Does the generator need to add inline code in the column definition
public $enum_extra_code = false; //Does the generator need to add extra code to generate code for the enums in the table
- public $add_after_clause = true; // Does the generator need to add the after clause for fields
-
- public $concat_character = null; //Characters to be used as concatenation operator. If not defined
- //MySQL CONCAT function will be use
-
- public $alter_column_sql = 'ALTER TABLE TABLENAME MODIFY COLUMN COLUMNSPECS'; //The SQL template to alter columns
-
public $drop_index_sql = 'ALTER TABLE TABLENAME DROP INDEX INDEXNAME'; //SQL sentence to drop one index
//TABLENAME, INDEXNAME are dinamically replaced
return $dbtype;
}
+ /**
+ * Function to emulate full ALTER TABLE which SQLite does not support.
+ * The function can be used to drop a column ($xmldb_delete_field != null and
+ * $xmldb_add_field == null), add a column ($xmldb_delete_field == null and
+ * $xmldb_add_field != null), change/rename a column ($xmldb_delete_field == null
+ * and $xmldb_add_field == null).
+ * @param xmldb_table $xmldb_table table to change
+ * @param xmldb_field $xmldb_add_field column to create/modify (full specification is required)
+ * @param xmldb_field $xmldb_delete_field column to delete/modify (only name field is required)
+ * @return array of strings (SQL statements to alter the table structure)
+ */
+ protected function getAlterTableSchema($xmldb_table, $xmldb_add_field=NULL, $xmldb_delete_field=NULL) {
+ /// Get the quoted name of the table and field
+ $tablename = $this->getTableName($xmldb_table);
+
+ $oldname = $xmldb_delete_field ? $xmldb_delete_field->getName() : NULL;
+ $newname = $xmldb_add_field ? $xmldb_add_field->getName() : NULL;
+ if($xmldb_delete_field) {
+ $xmldb_table->deleteField($oldname);
+ }
+ if($xmldb_add_field) {
+ $xmldb_table->addField($xmldb_add_field);
+ }
+ if($oldname) {
+ // alter indexes
+ $indexes = $xmldb_table->getIndexes();
+ foreach($indexes as $index) {
+ $fields = $index->getFields();
+ $i = array_search($oldname, $fields);
+ if($i!==FALSE) {
+ if($newname) {
+ $fields[$i] = $newname;
+ } else {
+ unset($fields[$i]);
+ }
+ $xmldb_table->deleteIndex($index->getName());
+ if(count($fields)) {
+ $index->setFields($fields);
+ $xmldb_table->addIndex($index);
+ }
+ }
+ }
+ // alter keys
+ $keys = $xmldb_table->getKeys();
+ foreach($keys as $key) {
+ $fields = $key->getFields();
+ $reffields = $key->getRefFields();
+ $i = array_search($oldname, $fields);
+ if($i!==FALSE) {
+ if($newname) {
+ $fields[$i] = $newname;
+ } else {
+ unset($fields[$i]);
+ unset($reffields[$i]);
+ }
+ $xmldb_table->deleteKey($key->getName());
+ if(count($fields)) {
+ $key->setFields($fields);
+ $key->setRefFields($fields);
+ $xmldb_table->addkey($key);
+ }
+ }
+ }
+ }
+ // prepare data copy
+ $fields = $xmldb_table->getFields();
+ foreach ($fields as $key => $field) {
+ $fieldname = $field->getName();
+ if($fieldname == $newname && $oldname && $oldname != $newname) {
+ // field rename operation
+ $fields[$key] = $this->getEncQuoted($oldname) . ' AS ' . $this->getEncQuoted($newname);
+ } else {
+ $fields[$key] = $this->getEncQuoted($field->getName());
+ }
+ }
+ $fields = implode(',', $fields);
+ $results[] = 'BEGIN TRANSACTION';
+ $results[] = 'CREATE TEMPORARY TABLE temp_data AS SELECT * FROM ' . $tablename;
+ $results[] = 'DROP TABLE ' . $tablename;
+ $results = array_merge($results, $this->getCreateTableSQL($xmldb_table));
+ $results[] = 'INSERT INTO ' . $tablename . ' SELECT ' . $fields . ' FROM temp_data';
+ $results[] = 'DROP TABLE temp_data';
+ $results[] = 'COMMIT';
+ return $results;
+ }
+
+ /**
+ * Given one xmldb_table and one xmldb_field, return the SQL statements needded to alter the field in the table
+ */
+ public function getAlterFieldSQL($xmldb_table, $xmldb_field, $skip_type_clause = NULL, $skip_default_clause = NULL, $skip_notnull_clause = NULL) {
+ return $this->getAlterTableSchema($xmldb_table, $xmldb_field, $xmldb_field);
+ }
+
+ /**
+ * Given one xmldb_table and one xmldb_key, return the SQL statements needded to add the key to the table
+ * note that undelying indexes will be added as parametrised by $xxxx_keys and $xxxx_index parameters
+ */
+ public function getAddKeySQL($xmldb_table, $xmldb_key) {
+ $xmldb_table->addKey($xmldb_key);
+ return $this->getAlterTableSchema($xmldb_table);
+ }
+
/**
* Given one xmldb_table and one xmldb_field, return the SQL statements needded to create its enum
* (usually invoked from getModifyEnumSQL()
*/
public function getCreateEnumSQL($xmldb_table, $xmldb_field) {
- /// For MySQL, just alter the field
- return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
+ return $this->getAlterTableSchema($xmldb_table, $xmldb_field, $xmldb_field);
}
/**
* (usually invoked from getModifyEnumSQL()
*/
public function getDropEnumSQL($xmldb_table, $xmldb_field) {
- /// For MySQL, just alter the field
- return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
+ return $this->getAlterTableSchema($xmldb_table, $xmldb_field, $xmldb_field);
}
/**
* (usually invoked from getModifyDefaultSQL()
*/
public function getCreateDefaultSQL($xmldb_table, $xmldb_field) {
- /// Just a wrapper over the getAlterFieldSQL() function for MySQL that
- /// is capable of handling defaults
- return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
+ return $this->getAlterTableSchema($xmldb_table, $xmldb_field, $xmldb_field);
}
/**
* SQLite is pretty diferent from the standard to justify this oveloading
*/
public function getRenameFieldSQL($xmldb_table, $xmldb_field, $newname) {
+ $oldfield = clone($xmldb_field);
+ $xmldb_field->setName($newname);
+ return $this->getAlterTableSchema($xmldb_table, $xmldb_field, $oldfield);
+ }
- // TODO: Add code to rename column
-
- /// Need a clone of xmldb_field to perform the change leaving original unmodified
- $xmldb_field_clone = clone($xmldb_field);
-
- /// Change the name of the field to perform the change
- $xmldb_field_clone->setName($xmldb_field_clone->getName() . ' ' . $newname);
+ /**
+ * Given one xmldb_table and one xmldb_index, return the SQL statements needded to rename the index in the table
+ */
+ function getRenameIndexSQL($xmldb_table, $xmldb_index, $newname) {
+ /// Get the real index name
+ $dbindexname = $this->mdb->get_manager()->find_index_name($xmldb_table, $xmldb_index);
+ $xmldb_index->setName($newname);
+ $results = array('DROP INDEX ' . $dbindexname);
+ $results = array_merge($results, $this->getCreateIndexSQL($xmldb_table, $xmldb_index));
+ return $results;
+ }
- $fieldsql = $this->getFieldSQL($xmldb_field_clone);
+ /**
+ * Given one xmldb_table and one xmldb_key, return the SQL statements needded to rename the key in the table
+ * Experimental! Shouldn't be used at all!
+ */
+ public function getRenameKeySQL($xmldb_table, $xmldb_key, $newname) {
+ $xmldb_table->deleteKey($xmldb_key->getName());
+ $xmldb_key->setName($newname);
+ $xmldb_table->addkey($xmldb_key);
+ return $this->getAlterTableSchema($xmldb_table);
+ }
- $sql = 'ALTER TABLE ' . $this->getTableName($xmldb_table) . ' CHANGE ' . $fieldsql;
+ /**
+ * Given one xmldb_table and one xmldb_field, return the SQL statements needded to drop the field from the table
+ */
+ public function getDropFieldSQL($xmldb_table, $xmldb_field) {
+ return $this->getAlterTableSchema($xmldb_table, NULL, $xmldb_field);
+ }
- return array($sql);
+ /**
+ * Given one xmldb_table and one xmldb_index, return the SQL statements needded to drop the index from the table
+ */
+ public function getDropIndexSQL($xmldb_table, $xmldb_index) {
+ $xmldb_table->deleteIndex($xmldb_index->getName());
+ return $this->getAlterTableSchema($xmldb_table);
}
+ /**
+ * Given one xmldb_table and one xmldb_index, return the SQL statements needded to drop the index from the table
+ */
+ public function getDropKeySQL($xmldb_table, $xmldb_key) {
+ $xmldb_table->deleteKey($xmldb_key->getName());
+ return $this->getAlterTableSchema($xmldb_table);
+ }
+
/**
* Given one xmldb_table and one xmldb_field, return the SQL statements needded to drop its default
* (usually invoked from getModifyDefaultSQL()
*/
public function getDropDefaultSQL($xmldb_table, $xmldb_field) {
- /// Just a wrapper over the getAlterFieldSQL() function for MySQL that
- /// is capable of handling defaults
- return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
+ return $this->getAlterTableSchema($xmldb_table, $xmldb_field, $xmldb_field);
}
/**
* Given one XMLDB Field, return its enum SQL
*/
public function getEnumSQL($xmldb_field) {
- return 'enum';
+ // Enum values are between /*LISTSTART*/ and /*LISTEND*/ so that
+ // get_columns can easily find them
+ return 'enum CHECK (' . $this->getEncQuoted($xmldb_field->getName()) . ' IN (/*LISTSTART*/' . implode(',', $xmldb_field->getEnumValues()) . '/*LISTEND*/))';
}
/**
* Optionally the function allows one xmldb_field to be specified in
* order to return only the check constraints belonging to one field.
* Each element contains the name of the constraint and its description
- * If no check constraints are found, returns an empty array
- * MySQL doesn't have check constraints in this implementation, but
- * we return them based on the enum fields in the table
+ * If no check constraints are found, returns an empty array.
*/
public function getCheckConstraintsFromDB($xmldb_table, $xmldb_field = null) {
-
- // TODO: add code for constraints
- return array();
+ $tablename = $xmldb_table->getName($xmldb_table);
+ // Fetch all the columns in the table
+ if (!$columns = $this->mdb->get_columns($tablename, false)) {
+ return array();
+ }
+ $results = array();
+ $filter = $xmldb_field ? $xmldb_field->getName() : NULL;
+ // Iterate over columns searching for enums
+ foreach ($columns as $key => $column) {
+ // Enum found, let's add it to the constraints list
+ if (!empty($column->enums) && (!$filter || $column->name == $filter)) {
+ $result = new object;
+ $result->name = $key;
+ $result->description = implode(', ', $column->enums);
+ $results[$key] = $result;
+ }
+ }
+ return $results;
}
/**
* @return string driver-dependent DSN
*/
protected function get_dsn() {
- return 'sqlite:' . $this->get_dbfilepath();
+ return 'sqlite:'.$this->get_dbfilepath();
}
/**
*/
public function get_dbfilepath() {
global $CFG;
- if(!empty($this->dboptions['file'])) {
+ if (!empty($this->dboptions['file'])) {
return $this->dboptions['file'];
}
- if($this->dbhost && $this->dbhost != 'localhost') {
+ if ($this->dbhost && $this->dbhost != 'localhost') {
$path = $this->dbhost;
} else {
$path = $CFG->dataroot;
}
- $path = ltrim($path, '\\/') . '/';
- if(!empty($this->dbuser)) {
- $path .= $this->dbuser . '_';
+ $path = rtrim($path, '\\/').'/';
+ if (!empty($this->dbuser)) {
+ $path .= $this->dbuser.'_';
}
- $path .= $this->dbname . '_' . md5($this->dbpass) . $this->database_file_extension;
+ $path .= $this->dbname.'_'.md5($this->dbpass).$this->database_file_extension;
return $path;
}
*/
public function get_tables() {
$tables = array();
- $sql = 'SELECT name FROM sqlite_master WHERE type="table" ORDER BY name';
- if($this->debug) {
+ $sql = 'SELECT name FROM sqlite_master WHERE type="table" UNION ALL SELECT name FROM sqlite_temp_master WHERE type="table" ORDER BY name';
+ if ($this->debug) {
$this->debug_query($sql);
}
$rstables = $this->pdb->query($sql);
*/
public function get_indexes($table) {
$indexes = array();
- $sql = 'PRAGMA index_list('. $this->prefix . $table . ')';
- if($this->debug) {
+ $sql = 'PRAGMA index_list('.$this->prefix.$table.')';
+ if ($this->debug) {
$this->debug_query($sql);
}
$rsindexes = $this->pdb->query($sql);
foreach($rsindexes as $index) {
$unique = (boolean)$index['unique'];
$index = $index['name'];
- $sql = 'PRAGMA index_info("' . $index . '")';
- if($this->debug) {
+ $sql = 'PRAGMA index_info("'.$index.'")';
+ if ($this->debug) {
$this->debug_query($sql);
}
$rscolumns = $this->pdb->query($sql);
return $this->columns[$table];
}
// get table's CREATE TABLE command (we'll need it for autoincrement fields)
- $sql = 'SELECT sql FROM sqlite_master WHERE type="table" AND tbl_name="'. $this->prefix . $table . '"';
- if($this->debug) {
+ $sql = 'SELECT sql FROM sqlite_master WHERE type="table" AND tbl_name="'.$this->prefix.$table.'"';
+ if ($this->debug) {
$this->debug_query($sql);
}
$createsql = $this->pdb->query($sql)->fetch();
- if(!$createsql) {
+ if (!$createsql) {
return false;
}
$createsql = $createsql['sql'];
$columns = array();
- $sql = 'PRAGMA table_info("'. $this->prefix . $table . '")';
- if($this->debug) {
+ $sql = 'PRAGMA table_info("'. $this->prefix.$table.'")';
+ if ($this->debug) {
$this->debug_query($sql);
}
$rscolumns = $this->pdb->query($sql);
);
$type = explode('(', $row['type']);
$columninfo['type'] = strtolower($type[0]);
- if(count($type) > 1) {
+ if (count($type) > 1) {
$size = explode(',', trim($type[1], ')'));
$columninfo['max_length'] = $size[0];
- if(count($size) > 1) {
+ if (count($size) > 1) {
$columninfo['scale'] = $size[1];
}
}
// datatype in the CREATE TABLE command. We try to guess which type is used here
switch(substr($columninfo['type'], 0, 3)) {
case 'int': // int integer
- if($columninfo['primary_key'] && preg_match('/' . $columninfo['name'] . '\W*integer\W*primary\W*key\W*autoincrement/im', $createsql)) {
+ if ($columninfo['primary_key'] && preg_match('/'.$columninfo['name'].'\W+integer\W+primary\W+key\W+autoincrement/im', $createsql)) {
$columninfo['meta_type'] = 'R';
$columninfo['auto_increment'] = true;
} else {
case 'cha': // char
$columninfo['meta_type'] = 'C';
break;
+ case 'enu': // enums
+ if (preg_match('|'.$columninfo['name'].'\W+in\W+\(/\*liststart\*/(.*?)/\*listend\*/\)|im', $createsql, $tmp)) {
+ $tmp = explode(',', $tmp[1]);
+ foreach($tmp as $value) {
+ $columninfo['enums'][] = trim($value, '\'"');
+ }
+ unset($tmp);
+ }
+ $columninfo['meta_type'] = 'C';
+ break;
case 'tex': // text
case 'clo': // clob
$columninfo['meta_type'] = 'X';
$columninfo['meta_type'] = 'D';
break;
}
+ if ($columninfo['has_default'] && ($columninfo['meta_type'] == 'X' || $columninfo['meta_type']== 'C')) {
+ // trim extra quotes from text default values
+ $columninfo['default_value'] = substr($columninfo['default_value'], 1, -1);
+ }
$columns[$columninfo['name']] = new database_column_info($columninfo);
}
* @return string the SQL statement with limiting clauses
*/
protected function get_limit_clauses($sql, $limitfrom=0, $limitnum=0) {
- if($limitnum) {
- $sql .= ' LIMIT ' . $limitnum;
- if($limitfrom) {
- $sql .= ' OFFSET ' . $limitfrom;
+ if ($limitnum) {
+ $sql .= ' LIMIT '.$limitnum;
+ if ($limitfrom) {
+ $sql .= ' OFFSET '.$limitfrom;
}
}
return $sql;
// Add items to the array on the fly, walking it
// _backwards_ splicing the elements in. The loop definition
// should skip first and last positions.
- for ($n=count($elements)-1; $n > 0 ; $n--) {
+ for ($n=count($elements)-1; $n > 0; $n--) {
array_splice($elements, $n, 0, $separator);
}
return implode('||', $elements);
projects / moodle.git / commitdiff