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Use postgres-specific tables to read database schema #321

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Use postgres-specific tables to read database schema #321

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54 changes: 23 additions & 31 deletions src/Metadata/Source/PostgresqlMetadata.php
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Original file line number Diff line number Diff line change
Expand Up @@ -47,37 +47,29 @@ protected function loadTableNameData($schema)

$p = $this->adapter->getPlatform();

$isColumns = [
['t', 'table_name'],
['t', 'table_type'],
['v', 'view_definition'],
['v', 'check_option'],
['v', 'is_updatable'],
];

array_walk($isColumns, function (&$c) use ($p) {
$c = $p->quoteIdentifierChain($c);
});

$sql = 'SELECT ' . implode(', ', $isColumns)
. ' FROM ' . $p->quoteIdentifierChain(['information_schema', 'tables']) . ' t'

. ' LEFT JOIN ' . $p->quoteIdentifierChain(['information_schema', 'views']) . ' v'
. ' ON ' . $p->quoteIdentifierChain(['t', 'table_schema'])
. ' = ' . $p->quoteIdentifierChain(['v', 'table_schema'])
. ' AND ' . $p->quoteIdentifierChain(['t', 'table_name'])
. ' = ' . $p->quoteIdentifierChain(['v', 'table_name'])

. ' WHERE ' . $p->quoteIdentifierChain(['t', 'table_type'])
. ' IN (\'BASE TABLE\', \'VIEW\')';

if ($schema != self::DEFAULT_SCHEMA) {
$sql .= ' AND ' . $p->quoteIdentifierChain(['t', 'table_schema'])
. ' = ' . $p->quoteTrustedValue($schema);
} else {
$sql .= ' AND ' . $p->quoteIdentifierChain(['t', 'table_schema'])
. ' != \'information_schema\'';
}
$sql = "
SELECT
c.relname as table_name,
CASE
WHEN c.oid = pg_my_temp_schema() THEN 'LOCAL TEMPORARY'
WHEN c.relkind = 'r' THEN 'BASE TABLE'
WHEN c.relkind = 'v' THEN 'VIEW'
WHEN c.relkind = 'f' THEN 'FOREIGN TABLE'
END AS table_type,
CASE
WHEN c.relkind = 'v' THEN (select pg_get_viewdef(c.relname, true))
END as view_definition,
CASE
WHEN c.relkind = 'v' THEN 'NONE'
END as check_option,
CASE
WHEN c.relkind = 'v' THEN 'NO'
END as is_updatable
FROM pg_class c
JOIN pg_namespace n
ON n.oid = c.relnamespace
WHERE n.nspname = " . $p->quoteTrustedValue($schema) . "
AND (c.relkind = 'r' OR c.relkind = 'v')";

$results = $this->adapter->query($sql, Adapter::QUERY_MODE_EXECUTE);

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