protected function findColumns($table)
{
$tableName = $this->db->quoteValue($table->name);
$schemaName = $this->db->quoteValue($table->schemaName);
$sql = <<<SQL
SELECT
d.nspname AS table_schema,
c.relname AS table_name,
a.attname AS column_name,
t.typname AS data_type,
a.attlen AS character_maximum_length,
pg_catalog.col_description(c.oid, a.attnum) AS column_comment,
a.atttypmod AS modifier,
a.attnotnull = false AS is_nullable,
CAST(pg_get_expr(ad.adbin, ad.adrelid) AS varchar) AS column_default,
coalesce(pg_get_expr(ad.adbin, ad.adrelid) ~ 'nextval',false) AS is_autoinc,
array_to_string((select array_agg(enumlabel) from pg_enum where enumtypid=a.atttypid)::varchar[],',') as enum_values,
CASE atttypid
WHEN 21 /*int2*/ THEN 16
WHEN 23 /*int4*/ THEN 32
WHEN 20 /*int8*/ THEN 64
WHEN 1700 /*numeric*/ THEN
CASE WHEN atttypmod = -1
THEN null
ELSE ((atttypmod - 4) >> 16) & 65535
END
WHEN 700 /*float4*/ THEN 24 /*FLT_MANT_DIG*/
WHEN 701 /*float8*/ THEN 53 /*DBL_MANT_DIG*/
ELSE null
END AS numeric_precision,
CASE
WHEN atttypid IN (21, 23, 20) THEN 0
WHEN atttypid IN (1700) THEN
CASE
WHEN atttypmod = -1 THEN null
ELSE (atttypmod - 4) & 65535
END
ELSE null
END AS numeric_scale,
CAST(
information_schema._pg_char_max_length(information_schema._pg_truetypid(a, t), information_schema._pg_truetypmod(a, t))
AS numeric
) AS size,
a.attnum = any (ct.conkey) as is_pkey
FROM
pg_class c
LEFT JOIN pg_attribute a ON a.attrelid = c.oid
LEFT JOIN pg_attrdef ad ON a.attrelid = ad.adrelid AND a.attnum = ad.adnum
LEFT JOIN pg_type t ON a.atttypid = t.oid
LEFT JOIN pg_namespace d ON d.oid = c.relnamespace
LEFT join pg_constraint ct on ct.conrelid=c.oid and ct.contype='p'
WHERE
a.attnum > 0 and t.typname != ''
and c.relname = {$tableName}
and d.nspname = {$schemaName}
ORDER BY
a.attnum;
SQL;
$columns = $this->db->createCommand($sql)->queryAll();
if (empty($columns)) {
return false;
}
foreach ($columns as $column) {
$column = $this->loadColumnSchema($column);
$table->columns[$column->name] = $column;
if ($column->isPrimaryKey) {
$table->primaryKey[] = $column->name;
if ($table->sequenceName === null && preg_match("/nextval\\('\"?\\w+\"?\\.?\"?\\w+\"?'(::regclass)?\\)/", $column->defaultValue) === 1) {
$table->sequenceName = preg_replace(['/nextval/', '/::/', '/regclass/', '/\'\\)/', '/\\(\'/'], '', $column->defaultValue);
}
$column->defaultValue = null;
} elseif ($column->defaultValue) {
if ($column->type === 'timestamp' && $column->defaultValue === 'now()') {
$column->defaultValue = new Expression($column->defaultValue);
} elseif ($column->type === 'boolean') {
$column->defaultValue = $column->defaultValue === 'true';
} elseif (stripos($column->dbType, 'bit') === 0 || stripos($column->dbType, 'varbit') === 0) {
$column->defaultValue = bindec(trim($column->defaultValue, 'B\''));
} elseif (preg_match("/^'(.*?)'::/", $column->defaultValue, $matches)) {
$column->defaultValue = $matches[1];
} elseif (preg_match('/^(?:\\()?(.*?)(?(1)\\))(?:::.+)?$/', $column->defaultValue, $matches)) {
if ($matches[1] === 'NULL') {
$column->defaultValue = null;
} else {
$column->defaultValue = $column->phpTypecast($matches[1]);
}
} else {
$column->defaultValue = $column->phpTypecast($column->defaultValue);
}
}
}
return true;
}