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[DATABASE] Re-introduce PostgreSQL support

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This commit is contained in:
Alexei Sorokin
2019-09-11 14:14:40 +03:00
parent 644b417f6c
commit ee7f0a2016
22 changed files with 606 additions and 410 deletions
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140
lib/database/pgsqlschema.php
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@@ -40,6 +40,24 @@ defined('GNUSOCIAL') || die();
*/
class PgsqlSchema extends Schema
{
public static $_single = null;
/**
* Main public entry point. Use this to get
* the singleton object.
*
* @param object|null $conn
* @param string|null dummy param
* @return Schema the (single) Schema object
*/
public static function get($conn = null, $_ = 'pgsql')
{
if (empty(self::$_single)) {
self::$_single = new Schema($conn, 'pgsql');
}
return self::$_single;
}
/**
* Returns a table definition array for the table
* in the schema with the given name.
@@ -72,7 +90,7 @@ class PgsqlSchema extends Schema
$field = [];
$field['type'] = $type = $row['udt_name'];
if ($type == 'char' || $type == 'varchar') {
if (in_array($type, ['char', 'bpchar', 'varchar'])) {
if ($row['character_maximum_length'] !== null) {
$field['length'] = intval($row['character_maximum_length']);
}
@@ -103,7 +121,8 @@ class PgsqlSchema extends Schema
// Pulling index info from pg_class & pg_index
// This can give us primary & unique key info, but not foreign key constraints
// so we exclude them and pick them up later.
$indexInfo = $this->getIndexInfo($table);
$indexInfo = $this->fetchIndexInfo($table);
foreach ($indexInfo as $row) {
$keyName = $row['key_name'];
@@ -144,7 +163,7 @@ class PgsqlSchema extends Schema
if ($keyName == "{$table}_pkey") {
$def['primary key'] = $cols;
} elseif (preg_match("/^{$table}_(.*)_fkey$/", $keyName, $matches)) {
$fkey = $this->getForeignKeyInfo($table, $keyName);
$fkey = $this->fetchForeignKeyInfo($table, $keyName);
$colMap = array_combine($cols, $fkey['col_names']);
$def['foreign keys'][$keyName] = [$fkey['table_name'], $colMap];
} else {
@@ -180,47 +199,42 @@ class PgsqlSchema extends Schema
* @return array of arrays
* @throws PEAR_Exception
*/
public function getIndexInfo($table)
public function fetchIndexInfo(string $table): array
{
$query = 'SELECT ' .
'(SELECT relname FROM pg_class WHERE oid=indexrelid) AS key_name, ' .
'* FROM pg_index ' .
'WHERE indrelid=(SELECT oid FROM pg_class WHERE relname=\'%s\') ' .
'AND indisprimary=\'f\' AND indisunique=\'f\' ' .
$query = 'SELECT indexname AS key_name, indexdef AS key_def, pg_index.* ' .
'FROM pg_index INNER JOIN pg_indexes ON pg_index.indexrelid = CAST(pg_indexes.indexname AS regclass) ' .
'WHERE tablename = \'%s\' AND indisprimary = FALSE AND indisunique = FALSE ' .
'ORDER BY indrelid, indexrelid';
$sql = sprintf($query, $table);
return $this->fetchQueryData($sql);
}
/**
* Column names from the foreign table can be resolved with a call to getTableColumnNames()
* @param string $table
* @param $constraint_name
* @return array array of rows with keys: fkey_name, table_name, table_id, col_names (array of strings)
* @param string $constraint_name
* @return array array of rows with keys: table_name, col_names (array of strings)
* @throws PEAR_Exception
*/
public function getForeignKeyInfo($table, $constraint_name)
public function fetchForeignKeyInfo(string $table, string $constraint_name): array
{
// In a sane world, it'd be easier to query the column names directly.
// But it's pretty hard to work with arrays such as col_indexes in direct SQL here.
$query = 'SELECT ' .
'(SELECT relname FROM pg_class WHERE oid=confrelid) AS table_name, ' .
'(SELECT relname FROM pg_class WHERE oid = confrelid) AS table_name, ' .
'confrelid AS table_id, ' .
'(SELECT indkey FROM pg_index WHERE indexrelid=conindid) AS col_indexes ' .
'(SELECT indkey FROM pg_index WHERE indexrelid = conindid) AS col_indices ' .
'FROM pg_constraint ' .
'WHERE conrelid=(SELECT oid FROM pg_class WHERE relname=\'%s\') ' .
'AND conname=\'%s\' ' .
'AND contype=\'f\'';
'WHERE conrelid = CAST(\'%s\' AS regclass) AND conname = \'%s\' AND contype = \'f\'';
$sql = sprintf($query, $table, $constraint_name);
$data = $this->fetchQueryData($sql);
if (count($data) < 1) {
throw new Exception("Could not find foreign key " . $constraint_name . " on table " . $table);
throw new Exception('Could not find foreign key ' . $constraint_name . ' on table ' . $table);
}
$row = $data[0];
return [
'table_name' => $row['table_name'],
'col_names' => $this->getTableColumnNames($row['table_id'], $row['col_indexes'])
'col_names' => $this->getTableColumnNames($row['table_id'], $row['col_indices'])
];
}
@@ -252,23 +266,6 @@ class PgsqlSchema extends Schema
return $out;
}
/**
* Translate the (mostly) mysql-ish column types into somethings more standard
* @param string column type
*
* @return string postgres happy column type
*/
private function _columnTypeTranslation($type)
{
$map = [
'datetime' => 'timestamp',
];
if (!empty($map[$type])) {
return $map[$type];
}
return $type;
}
/**
* Return the proper SQL for creating or
* altering a column.
@@ -296,12 +293,15 @@ class PgsqlSchema extends Schema
}
*/
if (!empty($cd['enum'])) {
foreach($cd['enum'] as &$val) {
// This'll have been added from our transform of 'serial' type
if (!empty($cd['auto_increment'])) {
$line[] = 'GENERATED BY DEFAULT AS IDENTITY';
} elseif (!empty($cd['enum'])) {
foreach ($cd['enum'] as &$val) {
$vals[] = "'" . $val . "'";
}
$line[] = 'CHECK (' . $name . ' IN (' . implode(',', $vals) . '))';
}
}
return implode(' ', $line);
}
@@ -338,6 +338,12 @@ class PgsqlSchema extends Schema
}
}
public function appendAlterDropPrimary(array &$phrase, string $tableName)
{
// name hack -- is this reliable?
$phrase[] = 'DROP CONSTRAINT ' . $this->quoteIdentifier($tableName . '_pkey');
}
/**
* Append an SQL statement to drop an index from a table.
* Note that in PostgreSQL, index names are DB-unique.
@@ -354,9 +360,8 @@ class PgsqlSchema extends Schema
public function mapType($column)
{
$map = [
'serial' => 'bigserial', // FIXME: creates the wrong name for the sequence for some internal sequence-lookup function, so better fix this to do the real 'create sequence' dance.
'bool' => 'boolean',
'numeric' => 'decimal',
'integer' => 'int',
'char' => 'bpchar',
'datetime' => 'timestamp',
'blob' => 'bytea',
'enum' => 'text',
@@ -367,16 +372,17 @@ class PgsqlSchema extends Schema
$type = $map[$type];
}
if ($type == 'int') {
if (!empty($column['size'])) {
$size = $column['size'];
if ($size == 'small') {
return 'int2';
} elseif ($size == 'big') {
return 'int8';
}
$size = $column['size'] ?? null;
if ($type === 'int') {
if (in_array($size, ['tiny', 'small'])) {
$type = 'int2';
} elseif ($size === 'big') {
$type = 'int8';
} else {
$type = 'int4';
}
return 'int4';
} elseif ($type === 'float') {
$type = ($size !== 'big') ? 'float4' : 'float8';
}
return $type;
@@ -398,17 +404,33 @@ class PgsqlSchema extends Schema
// No convenient support for field descriptions
unset($col['description']);
/*
if (isset($col['size'])) {
// Don't distinguish between tinyint and int.
if ($col['size'] == 'tiny' && $col['type'] == 'int') {
unset($col['size']);
}
switch ($col['type']) {
case 'serial':
$col['type'] = 'int';
$col['auto_increment'] = true;
break;
case 'datetime':
// Replace archaic MySQL-specific zero-dates with NULL
if (($col['default'] ?? null) === '0000-00-00 00:00:00') {
$col['default'] = null;
$col['not null'] = false;
}
break;
case 'timestamp':
// In MariaDB: If the column does not permit NULL values,
// assigning NULL (or not referencing the column at all
// when inserting) will set the column to CURRENT_TIMESTAMP
// FIXME: ON UPDATE CURRENT_TIMESTAMP
if ($col['not null'] && !isset($col['default'])) {
$col['default'] = 'CURRENT_TIMESTAMP';
}
break;
}
*/
$col['type'] = $this->mapType($col);
unset($col['size']);
}
if (!empty($tableDef['primary key'])) {
$tableDef['primary key'] = $this->filterKeyDef($tableDef['primary key']);
}