Yiisoft\Db\Pgsql\Schema::findConstraints()

Complexity

Conditions	10
Paths	56

Size

Total Lines	570
Code Lines	527

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	118
CRAP Score	11.1194

Importance

Changes	2
Bugs	0	Features	0

<?php
    protected function findConstraints(TableSchema $table): void
    {
        $tableName = $table->getName();
        $tableSchema = $table->getSchemaName();

        if ($tableName !== null) {
            $tableName = $this->quoteValue($tableName);
        }

        if ($tableSchema !== null) {
            $tableSchema = $this->quoteValue($tableSchema);

The assignment to $tableSchema is dead and can be removed.

        }

        /**
         * We need to extract the constraints de hard way since:
         * {@see http://www.postgresql.org/message-id/26677.1086673982@sss.pgh.pa.us}
         */

        $sql = <<<SQL
select
    ct.conname as constraint_name,
    a.attname as column_name,
    fc.relname as foreign_table_name,
    fns.nspname as foreign_table_schema,
    fa.attname as foreign_column_name
from
    (SELECT ct.conname, ct.conrelid, ct.confrelid, ct.conkey, ct.contype, ct.confkey, generate_subscripts(ct.conkey, 1) AS s
       FROM pg_constraint ct
    ) AS ct
    inner join pg_class c on c.oid=ct.conrelid
    inner join pg_namespace ns on c.relnamespace=ns.oid
    inner join pg_attribute a on a.attrelid=ct.conrelid and a.attnum = ct.conkey[ct.s]
    left join pg_class fc on fc.oid=ct.confrelid
    left join pg_namespace fns on fc.relnamespace=fns.oid
    left join pg_attribute fa on fa.attrelid=ct.confrelid and fa.attnum = ct.confkey[ct.s]
where
    ct.contype='f'
    and c.relname={$tableName}
    and ns.nspname={$tableSchema}
order by
    fns.nspname, fc.relname, a.attnum
SQL;

        /** @var array{array{tableName: string, columns: array}} $constraints */
        $constraints = [];
        $slavePdo = $this->getDb()->getSlavePdo();

        /** @var FindConstraintArray $constraint */
        foreach ($this->getDb()->createCommand($sql)->queryAll() as $constraint) {
            if ($slavePdo !== null && $slavePdo->getAttribute(PDO::ATTR_CASE) === PDO::CASE_UPPER) {
                $constraint = array_change_key_case($constraint, CASE_LOWER);
            }

            if ($constraint['foreign_table_schema'] !== $this->defaultSchema) {
                $foreignTable = $constraint['foreign_table_schema'] . '.' . $constraint['foreign_table_name'];
            } else {
                $foreignTable = $constraint['foreign_table_name'];
            }

            $name = $constraint['constraint_name'];

            if (!isset($constraints[$name])) {
                $constraints[$name] = [
                    'tableName' => $foreignTable,
                    'columns' => [],
                ];
            }

            $constraints[$name]['columns'][$constraint['column_name']] = $constraint['foreign_column_name'];
        }

        /**
         * @var int|string $foreingKeyName.
         * @var array{tableName: string, columns: array} $constraint
         */
        foreach ($constraints as $foreingKeyName => $constraint) {
            $table->foreignKey(
                (string) $foreingKeyName,
                array_merge([$constraint['tableName']], $constraint['columns'])
            );
        }
    }

    /**
     * Gets information about given table unique indexes.
     *
     * @param TableSchema $table the table metadata.
     *
     * @throws Exception|InvalidConfigException|Throwable
     *
     * @return array with index and column names.
     */
    protected function getUniqueIndexInformation(TableSchema $table): array
    {
        $sql = <<<'SQL'
SELECT
    i.relname as indexname,
    pg_get_indexdef(idx.indexrelid, k + 1, TRUE) AS columnname
FROM (
  SELECT *, generate_subscripts(indkey, 1) AS k
  FROM pg_index
) idx
INNER JOIN pg_class i ON i.oid = idx.indexrelid
INNER JOIN pg_class c ON c.oid = idx.indrelid
INNER JOIN pg_namespace ns ON c.relnamespace = ns.oid
WHERE idx.indisprimary = FALSE AND idx.indisunique = TRUE
AND c.relname = :tableName AND ns.nspname = :schemaName
ORDER BY i.relname, k
SQL;

        return $this->getDb()->createCommand($sql, [
            ':schemaName' => $table->getSchemaName(),
            ':tableName' => $table->getName(),
        ])->queryAll();
    }

    /**
     * Returns all unique indexes for the given table.
     *
     * Each array element is of the following structure:
     *
     * ```php
     * [
     *     'IndexName1' => ['col1' [, ...]],
     *     'IndexName2' => ['col2' [, ...]],
     * ]
     * ```
     *
     * @param TableSchema $table the table metadata
     *
     * @throws Exception|InvalidConfigException|Throwable
     *
     * @return array all unique indexes for the given table.
     */
    public function findUniqueIndexes(TableSchema $table): array
    {
        $uniqueIndexes = [];
        $slavePdo = $this->getDb()->getSlavePdo();

        /** @var array{indexname: string, columnname: string} $row */
        foreach ($this->getUniqueIndexInformation($table) as $row) {
            if ($slavePdo !== null && $slavePdo->getAttribute(PDO::ATTR_CASE) === PDO::CASE_UPPER) {
                $row = array_change_key_case($row, CASE_LOWER);
            }

            $column = $row['columnname'];

            if (!empty($column) && $column[0] === '"') {
                /**
                 * postgres will quote names that are not lowercase-only.
                 *
                 * {@see https://github.com/yiisoft/yii2/issues/10613}
                 */
                $column = substr($column, 1, -1);
            }

            $uniqueIndexes[$row['indexname']][] = $column;
        }

        return $uniqueIndexes;
    }

    /**
     * Collects the metadata of table columns.
     *
     * @param TableSchema $table the table metadata.
     *
     * @throws Exception|InvalidConfigException|JsonException|Throwable
     *
     * @return bool whether the table exists in the database.
     */
    protected function findColumns(TableSchema $table): bool
    {
        $tableName = $table->getName();
        $schemaName = $table->getSchemaName();
        $orIdentity = '';

        if ($tableName !== null) {
            $tableName = $this->getDb()->quoteValue($tableName);
        }

        if ($schemaName !== null) {
            $schemaName = $this->getDb()->quoteValue($schemaName);
        }

        if (version_compare($this->getDb()->getServerVersion(), '12.0', '>=')) {
            $orIdentity = 'OR a.attidentity != \'\'';
        }

        $sql = <<<SQL
SELECT
    d.nspname AS table_schema,
    c.relname AS table_name,
    a.attname AS column_name,
    COALESCE(td.typname, tb.typname, t.typname) AS data_type,
    COALESCE(td.typtype, tb.typtype, t.typtype) AS type_type,
    a.attlen AS character_maximum_length,
    pg_catalog.col_description(c.oid, a.attnum) AS column_comment,
    a.atttypmod AS modifier,
    a.attnotnull = false AS is_nullable,
    CAST(pg_get_expr(ad.adbin, ad.adrelid) AS varchar) AS column_default,
    coalesce(pg_get_expr(ad.adbin, ad.adrelid) ~ 'nextval',false) {$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 /*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,
    COALESCE(NULLIF(a.attndims, 0), NULLIF(t.typndims, 0), (t.typcategory='A')::int) AS dimension
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_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'
WHERE
    a.attnum > 0 AND t.typname != '' AND NOT a.attisdropped
    AND c.relname = {$tableName}
    AND d.nspname = {$schemaName}
ORDER BY
    a.attnum;
SQL;

        /** @var array columns */
        $columns = $this->getDb()->createCommand($sql)->queryAll();
        $slavePdo = $this->getDb()->getSlavePdo();

        if (empty($columns)) {
            return false;
        }

        /** @var array<array-key, mixed> $column */
        foreach ($columns as $column) {
            if ($slavePdo !== null && $slavePdo->getAttribute(PDO::ATTR_CASE) === PDO::CASE_UPPER) {
                $column = array_change_key_case($column, CASE_LOWER);
            }

            /** @psalm-var ColumnArray $column */
            $loadColumnSchema = $this->loadColumnSchema($column);
            $table->columns($loadColumnSchema->getName(), $loadColumnSchema);

            /** @var mixed $defaultValue */
            $defaultValue = $loadColumnSchema->getDefaultValue();

            if ($loadColumnSchema->isPrimaryKey()) {
                $table->primaryKey($loadColumnSchema->getName());

                if ($table->getSequenceName() === null) {
                    $table->sequenceName($loadColumnSchema->getSequenceName());
                }

                $loadColumnSchema->defaultValue(null);
            } elseif ($defaultValue) {
                if (
                    is_string($defaultValue) &&
                    in_array($loadColumnSchema->getType(), [self::TYPE_TIMESTAMP, self::TYPE_DATE, self::TYPE_TIME], true) &&
                    in_array(
                        strtoupper($defaultValue),
                        ['NOW()', 'CURRENT_TIMESTAMP', 'CURRENT_DATE', 'CURRENT_TIME'],
                        true
                    )
                ) {
                    $loadColumnSchema->defaultValue(new Expression($defaultValue));
                } elseif ($loadColumnSchema->getType() === 'boolean') {
                    $loadColumnSchema->defaultValue(($defaultValue  === 'true'));
                } elseif (is_string($defaultValue) && preg_match("/^B'(.*?)'::/", $defaultValue, $matches)) {
                    $loadColumnSchema->defaultValue(bindec($matches[1]));
                } elseif (is_string($defaultValue) && preg_match("/^'(\d+)'::\"bit\"$/", $defaultValue, $matches)) {
                    $loadColumnSchema->defaultValue(bindec($matches[1]));
                } elseif (is_string($defaultValue) && preg_match("/^'(.*?)'::/", $defaultValue, $matches)) {
                    $loadColumnSchema->defaultValue($loadColumnSchema->phpTypecast($matches[1]));
                } elseif (
                    is_string($defaultValue) &&
                    preg_match('/^(\()?(.*?)(?(1)\))(?:::.+)?$/', $defaultValue, $matches)
                ) {
                    if ($matches[2] === 'NULL') {
                        $loadColumnSchema->defaultValue(null);
                    } else {
                        $loadColumnSchema->defaultValue($loadColumnSchema->phpTypecast($matches[2]));
                    }
                } else {
                    $loadColumnSchema->defaultValue($loadColumnSchema->phpTypecast($defaultValue));
                }
            }
        }

        return true;
    }

    /**
     * Loads the column information into a {@see ColumnSchema} object.
     *
     * @param array{
     *   table_schema: string,
     *   table_name: string,
     *   column_name: string,
     *   data_type: string,
     *   type_type: string|null,
     *   character_maximum_length: int,
     *   column_comment: string|null,
     *   modifier: int,
     *   is_nullable: bool,
     *   column_default: mixed,
     *   is_autoinc: bool,
     *   sequence_name: string|null,
     *   enum_values: array<array-key, float|int|string>|string|null,
     *   numeric_precision: int|null,
     *   numeric_scale: int|null,
     *   size: string|null,
     *   is_pkey: bool|null,
     *   dimension: int
     * } $info column information.
     *
     * @return ColumnSchema the column schema object.
     */
    protected function loadColumnSchema(array $info): ColumnSchema
    {
        $column = $this->createColumnSchema();
        $column->allowNull($info['is_nullable']);
        $column->autoIncrement($info['is_autoinc']);
        $column->comment($info['column_comment']);
        $column->dbType($info['data_type']);
        $column->defaultValue($info['column_default']);
        $column->enumValues(($info['enum_values'] !== null)
            ? explode(',', str_replace(["''"], ["'"], $info['enum_values'])) : null);
        $column->unsigned(false); // has no meaning in PG
        $column->primaryKey((bool) $info['is_pkey']);
        $column->name($info['column_name']);
        $column->precision($info['numeric_precision']);
        $column->scale($info['numeric_scale']);
        $column->size($info['size'] === null ? null : (int) $info['size']);
        $column->dimension($info['dimension']);

        /**
         * pg_get_serial_sequence() doesn't track DEFAULT value change. GENERATED BY IDENTITY columns always have null
         * default value.
         *
         * @var mixed $defaultValue
         */
        $defaultValue = $column->getDefaultValue();
        $sequenceName = $info['sequence_name'] ?? null;

        if (
            isset($defaultValue) &&
            is_string($defaultValue) &&
            preg_match("/nextval\\('\"?\\w+\"?\.?\"?\\w+\"?'(::regclass)?\\)/", $defaultValue) === 1
        ) {
            $column->sequenceName(preg_replace(
                ['/nextval/', '/::/', '/regclass/', '/\'\)/', '/\(\'/'],
                '',
                $defaultValue
            ));
        } elseif ($sequenceName !== null) {
            $column->sequenceName($this->resolveTableName($sequenceName)->getFullName());
        }

        if (isset($this->typeMap[$column->getDbType()])) {
            $column->type($this->typeMap[$column->getDbType()]);
        } else {
            $column->type(self::TYPE_STRING);
        }

        $column->phpType($this->getColumnPhpType($column));

        return $column;
    }

    /**
     * Executes the INSERT command, returning primary key values.
     *
     * @param string $table the table that new rows will be inserted into.
     * @param array $columns the column data (name => value) to be inserted into the table.
     *
     * @throws Exception|InvalidConfigException|Throwable
     *
     * @return array|false primary key values or false if the command fails.
     */
    public function insert(string $table, array $columns)
    {
        $params = [];
        $returnColumns = [];
        $sql = $this->getDb()->getQueryBuilder()->insert($table, $columns, $params);
        $tableSchema = $this->getTableSchema($table);

        if ($tableSchema !== null) {
            $returnColumns = $tableSchema->getPrimaryKey();
        }

        if (!empty($returnColumns)) {
            $returning = [];
            /** @var string $name */
            foreach ($returnColumns as $name) {
                $returning[] = $this->quoteColumnName($name);
            }
            $sql .= ' RETURNING ' . implode(', ', $returning);
        }

        $command = $this->getDb()->createCommand($sql, $params);
        $command->prepare(false);
        $result = $command->queryOne();

        $pdoStatement = $command->getPdoStatement();

        return $pdoStatement !== null && !$pdoStatement->rowCount() ? false : $result;
    }

    /**
     * Loads multiple types of constraints and returns the specified ones.
     *
     * @param string $tableName table name.
     * @param string $returnType return type:
     * - primaryKey
     * - foreignKeys
     * - uniques
     * - checks
     *
     * @throws Exception|InvalidConfigException|Throwable
     *
     * @return (CheckConstraint|Constraint|ForeignKeyConstraint)[]|Constraint|null constraints.
     *
     * @psalm-return Constraint|list<CheckConstraint|Constraint|ForeignKeyConstraint>|null
     */
    private function loadTableConstraints(string $tableName, string $returnType)
    {
        /** @var string $sql */
        $sql = <<<'SQL'
SELECT
    "c"."conname" AS "name",
    "a"."attname" AS "column_name",
    "c"."contype" AS "type",
    "ftcns"."nspname" AS "foreign_table_schema",
    "ftc"."relname" AS "foreign_table_name",
    "fa"."attname" AS "foreign_column_name",
    "c"."confupdtype" AS "on_update",
    "c"."confdeltype" AS "on_delete",
    pg_get_constraintdef("c"."oid") AS "check_expr"
FROM "pg_class" AS "tc"
INNER JOIN "pg_namespace" AS "tcns"
    ON "tcns"."oid" = "tc"."relnamespace"
INNER JOIN "pg_constraint" AS "c"
    ON "c"."conrelid" = "tc"."oid"
INNER JOIN "pg_attribute" AS "a"
    ON "a"."attrelid" = "c"."conrelid" AND "a"."attnum" = ANY ("c"."conkey")
LEFT JOIN "pg_class" AS "ftc"
    ON "ftc"."oid" = "c"."confrelid"
LEFT JOIN "pg_namespace" AS "ftcns"
    ON "ftcns"."oid" = "ftc"."relnamespace"
LEFT JOIN "pg_attribute" "fa"
    ON "fa"."attrelid" = "c"."confrelid" AND "fa"."attnum" = ANY ("c"."confkey")
WHERE "tcns"."nspname" = :schemaName AND "tc"."relname" = :tableName
ORDER BY "a"."attnum" ASC, "fa"."attnum" ASC
SQL;

        /** @var array<array-key, string> $actionTypes */
        $actionTypes = [
            'a' => 'NO ACTION',
            'r' => 'RESTRICT',
            'c' => 'CASCADE',
            'n' => 'SET NULL',
            'd' => 'SET DEFAULT',
        ];

        $resolvedName = $this->resolveTableName($tableName);

It seems like $tableName can also be of type null; however, parameter $name of Yiisoft\Db\Pgsql\Schema::resolveTableName() does only seem to accept string, maybe add an additional type check?

        $constraints = $this->getDb()->createCommand($sql, [
            ':schemaName' => $resolvedName->getSchemaName(),
            ':tableName' => $resolvedName->getName(),
        ])->queryAll();

        /** @var array<array-key, array> $constraints */
        $constraints = $this->normalizePdoRowKeyCase($constraints, true);
        $constraints = ArrayHelper::index($constraints, null, ['type', 'name']);

        $result = [
            'primaryKey' => null,
            'foreignKeys' => [],
            'uniques' => [],
            'checks' => [],
        ];

        /**
         * @var string $type
         * @var array $names
         */
        foreach ($constraints as $type => $names) {
            /**
             * @psalm-var object|string|null $name
             * @psalm-var ConstraintArray $constraint
             */
            foreach ($names as $name => $constraint) {
                switch ($type) {
                    case 'p':
                        $ct = (new Constraint())
                            ->name($name)
                            ->columnNames(ArrayHelper::getColumn($constraint, 'column_name'));

                        $result['primaryKey'] = $ct;
                        break;
                    case 'f':
                        $onDelete = $actionTypes[$constraint[0]['on_delete']] ?? null;
                        $onUpdate = $actionTypes[$constraint[0]['on_update']] ?? null;

                        $fk = (new ForeignKeyConstraint())
                            ->name($name)
                            ->columnNames(array_values(
                                array_unique(ArrayHelper::getColumn($constraint, 'column_name'))
                            ))
                            ->foreignSchemaName($constraint[0]['foreign_table_schema'])
                            ->foreignTableName($constraint[0]['foreign_table_name'])
                            ->foreignColumnNames(array_values(
                                array_unique(ArrayHelper::getColumn($constraint, 'foreign_column_name'))
                            ))
                            ->onDelete($onDelete)
                            ->onUpdate($onUpdate);

                        $result['foreignKeys'][] = $fk;
                        break;
                    case 'u':
                        $ct = (new Constraint())
                            ->name($name)
                            ->columnNames(ArrayHelper::getColumn($constraint, 'column_name'));

                        $result['uniques'][] = $ct;
                        break;
                    case 'c':
                        $ck = (new CheckConstraint())
                            ->name($name)
                            ->columnNames(ArrayHelper::getColumn($constraint, 'column_name'))
                            ->expression($constraint[0]['check_expr']);

                        $result['checks'][] = $ck;
                        break;
                }
            }
        }

        foreach ($result as $type => $data) {
            $this->setTableMetadata($tableName, $type, $data);

It seems like $tableName can also be of type null; however, parameter $name of Yiisoft\Db\Schema\Schema::setTableMetadata() does only seem to accept string, maybe add an additional type check?

        }

        return $result[$returnType];

The variable $returnType seems to be never defined.

    }