Collects the metadata of table columns.
protected function findColumns($table)
{
$tableName = $this->db->quoteValue($table->name);
$schemaName = $this->db->quoteValue($table->schemaName);
$orIdentity = '';
if (version_compare($this->db->serverVersion, '12.0', '>=')) {
$orIdentity = 'OR attidentity != \'\'';
}
$sql = <<<SQL
CT
d.nspname AS table_schema,
c.relname AS table_name,
a.attname AS column_name,
COALESCE(td.typname, tb.typname, t.typname) AS data_type,
COALESCE(td.typtype, tb.typtype, t.typtype) AS type_type,
(SELECT nspname FROM pg_namespace WHERE oid = COALESCE(td.typnamespace, tb.typnamespace, t.typnamespace)) AS type_scheme,
a.attlen AS character_maximum_length,
pg_catalog.col_description(c.oid, a.attnum) AS column_comment,
a.atttypmod AS modifier,
a.attnotnull = false AS is_nullable,
CAST(pg_get_expr(ad.adbin, ad.adrelid) AS varchar) AS column_default,
coalesce(pg_get_expr(ad.adbin, ad.adrelid) ~ 'nextval',false) {$orIdentity} AS is_autoinc,
pg_get_serial_sequence(quote_ident(d.nspname) || '.' || quote_ident(c.relname), a.attname) AS sequence_name,
CASE WHEN COALESCE(td.typtype, tb.typtype, t.typtype) = 'e'::char
THEN array_to_string((SELECT array_agg(enumlabel) FROM pg_enum WHERE enumtypid = COALESCE(td.oid, tb.oid, a.atttypid))::varchar[], ',')
ELSE NULL
END AS enum_values,
CASE atttypid
WHEN 21 THEN 16
WHEN 23 THEN 32
WHEN 20 THEN 64
WHEN 1700 THEN
CASE WHEN atttypmod = -1
THEN null
ELSE ((atttypmod - 4) >> 16) & 65535
END
WHEN 700 THEN 24
WHEN 701 THEN 53
ELSE null
END AS numeric_precision,
CASE
WHEN atttypid IN (21, 23, 20) THEN 0
WHEN atttypid IN (1700) THEN
CASE
WHEN atttypmod = -1 THEN null
ELSE (atttypmod - 4) & 65535
END
ELSE null
END AS numeric_scale,
CAST(
information_schema._pg_char_max_length(information_schema._pg_truetypid(a, t), information_schema._pg_truetypmod(a, t))
AS numeric
) AS size,
a.attnum = any (ct.conkey) as is_pkey,
COALESCE(NULLIF(a.attndims, 0), NULLIF(t.typndims, 0), (t.typcategory='A')::int) AS dimension
pg_class c
LEFT JOIN pg_attribute a ON a.attrelid = c.oid
LEFT JOIN pg_attrdef ad ON a.attrelid = ad.adrelid AND a.attnum = ad.adnum
LEFT JOIN pg_type t ON a.atttypid = t.oid
LEFT JOIN pg_type tb ON (a.attndims > 0 OR t.typcategory='A') AND t.typelem > 0 AND t.typelem = tb.oid OR t.typbasetype > 0 AND t.typbasetype = tb.oid
LEFT JOIN pg_type td ON t.typndims > 0 AND t.typbasetype > 0 AND tb.typelem = td.oid
LEFT JOIN pg_namespace d ON d.oid = c.relnamespace
LEFT JOIN pg_constraint ct ON ct.conrelid = c.oid AND ct.contype = 'p'
E
a.attnum > 0 AND t.typname != '' AND NOT a.attisdropped
AND c.relname = {$tableName}
AND d.nspname = {$schemaName}
R BY
a.attnum;
$columns = $this->db->createCommand($sql)->queryAll();
if (empty($columns)) {
return false;
}
foreach ($columns as $column) {
if ($this->db->slavePdo->getAttribute(\PDO::ATTR_CASE) === \PDO::CASE_UPPER) {
$column = array_change_key_case($column, CASE_LOWER);
}
$column = $this->loadColumnSchema($column);
$table->columns[$column->name] = $column;
if ($column->isPrimaryKey) {
$table->primaryKey[] = $column->name;
if ($table->sequenceName === null) {
$table->sequenceName = $column->sequenceName;
}
$column->defaultValue = null;
} elseif ($column->defaultValue) {
if (
in_array($column->type, [self::TYPE_TIMESTAMP, self::TYPE_DATE, self::TYPE_TIME], true) &&
in_array(
strtoupper($column->defaultValue),
['NOW()', 'CURRENT_TIMESTAMP', 'CURRENT_DATE', 'CURRENT_TIME'],
true
)
) {
$column->defaultValue = new Expression($column->defaultValue);
} elseif ($column->type === 'boolean') {
$column->defaultValue = ($column->defaultValue === 'true');
} elseif (preg_match("/^B'(.*?)'::/", $column->defaultValue, $matches)) {
$column->defaultValue = bindec($matches[1]);
} elseif (preg_match("/^'(\d+)'::\"bit\"$/", $column->defaultValue, $matches)) {
$column->defaultValue = bindec($matches[1]);
} elseif (preg_match("/^'(.*?)'::/", $column->defaultValue, $matches)) {
$column->defaultValue = $column->phpTypecast($matches[1]);
} elseif (preg_match('/^(\()?(.*?)(?(1)\))(?:::.+)?$/', $column->defaultValue, $matches)) {
if ($matches[2] === 'NULL') {
$column->defaultValue = null;
} else {
$column->defaultValue = $column->phpTypecast($matches[2]);
}
} else {
$column->defaultValue = $column->phpTypecast($column->defaultValue);
}
}
}
return true;
}
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