Schema::findUniqueIndexes() - Code Metrics - Inspection of "Merge pull request #28 from terabytesoftw/revert-c..." - yiisoft/db-mysql - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 6b0cdb...1ca6d4 )

by Wilmer
created 2020-03-23 17:53 UTC
Schema::findUniqueIndexes() A

↳ Parent: Schema
Complexity

Conditions	3
Paths	2
Size

Total Lines	17
Code Lines	9
Duplication

Lines	0
Ratio	0 %
Code Coverage

Tests	10
CRAP Score	3
Importance

Changes
Metric	Value
cc	3
eloc	9
nc	2
nop	1
dl	0
loc	17
ccs	10
cts	10
cp	1
crap	3
rs	9.9666
c	0
b	0
f	0
<?php

declare(strict_types=1);

namespace Yiisoft\Db\Mysql\Schema;

use Yiisoft\Arrays\ArrayHelper;
use Yiisoft\Db\Constraint\Constraint;
use Yiisoft\Db\Constraint\ConstraintFinderInterface;
use Yiisoft\Db\Constraint\ConstraintFinderTrait;
use Yiisoft\Db\Constraint\ForeignKeyConstraint;
use Yiisoft\Db\Constraint\IndexConstraint;
use Yiisoft\Db\Exception\Exception;
use Yiisoft\Db\Exception\InvalidArgumentException;
use Yiisoft\Db\Exception\InvalidConfigException;
use Yiisoft\Db\Exception\NotSupportedException;
use Yiisoft\Db\Expression\Expression;
use Yiisoft\Db\Mysql\Query\QueryBuilder;
use Yiisoft\Db\Schema\Schema as AbstractSchema;

class Schema extends AbstractSchema implements ConstraintFinderInterface
{
    use ConstraintFinderTrait;

    protected string $tableQuoteCharacter = '`';
    protected string $columnQuoteCharacter = '`';
    private bool $oldMysql;
    private array $typeMap = [
        'tinyint' => self::TYPE_TINYINT,
        'bit' => self::TYPE_INTEGER,
        'smallint' => self::TYPE_SMALLINT,
        'mediumint' => self::TYPE_INTEGER,
        'int' => self::TYPE_INTEGER,
        'integer' => self::TYPE_INTEGER,
        'bigint' => self::TYPE_BIGINT,
        'float' => self::TYPE_FLOAT,
        'double' => self::TYPE_DOUBLE,
        'real' => self::TYPE_FLOAT,
        'decimal' => self::TYPE_DECIMAL,
        'numeric' => self::TYPE_DECIMAL,
        'tinytext' => self::TYPE_TEXT,
        'mediumtext' => self::TYPE_TEXT,
        'longtext' => self::TYPE_TEXT,
        'longblob' => self::TYPE_BINARY,
        'blob' => self::TYPE_BINARY,
        'text' => self::TYPE_TEXT,
        'varchar' => self::TYPE_STRING,
        'string' => self::TYPE_STRING,
        'char' => self::TYPE_CHAR,
        'datetime' => self::TYPE_DATETIME,
        'year' => self::TYPE_DATE,
        'date' => self::TYPE_DATE,
        'time' => self::TYPE_TIME,
        'timestamp' => self::TYPE_TIMESTAMP,
        'enum' => self::TYPE_STRING,
        'varbinary' => self::TYPE_BINARY,
        'json' => self::TYPE_JSON,
    ];

    /**
     * Resolves the table name and schema name (if any).
     *
     * @param string $name the table name.
     *
     * @return TableSchema
     *
     * {@see \Yiisoft\Db\Schema\TableSchema}
     */
    protected function resolveTableName(string $name): TableSchema
    {
        $resolvedName = new TableSchema();

        $parts = \explode('.', \str_replace('`', '', $name));

        if (isset($parts[1])) {
            $resolvedName->schemaName($parts[0]);
            $resolvedName->name($parts[1]);
        } else {
            $resolvedName->schemaName($this->defaultSchema);
            $resolvedName->name($name);
        }

        $resolvedName->fullName(($resolvedName->getSchemaName() !== $this->defaultSchema ?
            $resolvedName->getSchemaName() . '.' : '') . $resolvedName->getName());

        return $resolvedName;
    }

    /**
     * Returns all table names in the database.
     *
     * This method should be overridden by child classes in order to support this feature because the default
     * implementation simply throws an exception.
     *
     * @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
     *
     * @throws Exception
     * @throws InvalidConfigException
     * @throws InvalidArgumentException
     *
     * @return array all table names in the database. The names have NO schema name prefix.
     */
    protected function findTableNames(string $schema = ''): array
    {
        $sql = 'SHOW TABLES';

        if ($schema !== '') {
            $sql .= ' FROM ' . $this->quoteSimpleTableName($schema);
        }

        return $this->getDb()->createCommand($sql)->queryColumn();
    }

    /**
     * Loads the metadata for the specified table.
     *
     * @param string $name table name.
     *
     * @throws \Exception
     *
     * @return TableSchema|null DBMS-dependent table metadata, `null` if the table does not exist.
     */
    protected function loadTableSchema(string $name): ?TableSchema
    {
        $table = new TableSchema();

        $this->resolveTableNames($table, $name);

        if ($this->findColumns($table)) {
            $this->findConstraints($table);

            return $table;
        }

        return null;
    }

    /**
     * Loads a primary key for the given table.
     *
     * @param string $tableName table name.
     *
     * @return Constraint|null primary key for the given table, `null` if the table has no primary key.
     */
    protected function loadTablePrimaryKey(string $tableName): ?Constraint
    {
        return $this->loadTableConstraints($tableName, 'primaryKey');
    }

    /**
     * Loads all foreign keys for the given table.
     *
     * @param string $tableName table name.
     *
     * @return ForeignKeyConstraint[] foreign keys for the given table.
     */
    protected function loadTableForeignKeys(string $tableName): array
    {
        return $this->loadTableConstraints($tableName, 'foreignKeys');
    }

    /**
     * Loads all indexes for the given table.
     *
     * @param string $tableName table name.
     *
     * @return IndexConstraint[] indexes for the given table.
     */
    protected function loadTableIndexes(string $tableName): array
    {
        static $sql = <<<'SQL'
SELECT
    `s`.`INDEX_NAME` AS `name`,
    `s`.`COLUMN_NAME` AS `column_name`,
    `s`.`NON_UNIQUE` ^ 1 AS `index_is_unique`,
    `s`.`INDEX_NAME` = 'PRIMARY' AS `index_is_primary`
FROM `information_schema`.`STATISTICS` AS `s`
WHERE `s`.`TABLE_SCHEMA` = COALESCE(:schemaName, DATABASE()) AND `s`.`INDEX_SCHEMA` = `s`.`TABLE_SCHEMA` AND `s`.`TABLE_NAME` = :tableName
ORDER BY `s`.`SEQ_IN_INDEX` ASC
SQL;

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

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

        $indexes = $this->normalizePdoRowKeyCase($indexes, true);
        $indexes = ArrayHelper::index($indexes, null, 'name');
        $result = [];

        foreach ($indexes as $name => $index) {
            $ic = new IndexConstraint();

            $ic->primary((bool) $index[0]['index_is_primary']);
            $ic->unique((bool) $index[0]['index_is_unique']);
            $ic->name($name !== 'PRIMARY' ? $name : null);
            $ic->columnNames(ArrayHelper::getColumn($index, 'column_name'));

            $result[] = $ic;
        }

        return $result;
    }

    /**
     * Loads all unique constraints for the given table.
     *
     * @param string $tableName table name.
     *
     * @return Constraint[] unique constraints for the given table.
     */
    protected function loadTableUniques(string $tableName): array
    {
        return $this->loadTableConstraints($tableName, 'uniques');
    }

    /**
     * Loads all check constraints for the given table.
     *
     * @param string $tableName table name.
     *
     * @return CheckConstraint[] check constraints for the given table.
     */
    protected function loadTableChecks(string $tableName): array
    protected function loadTableChecks(/** @scrutinizer ignore-unused */ string $tableName): array
    {
        throw new NotSupportedException('MySQL does not support check constraints.');
    }

    /**
     * Loads all default value constraints for the given table.
     *
     * @param string $tableName table name.
     *
     * @return DefaultValueConstraint[] default value constraints for the given table.
     */
    protected function loadTableDefaultValues(string $tableName): array
    protected function loadTableDefaultValues(/** @scrutinizer ignore-unused */ string $tableName): array
    {
        throw new NotSupportedException('MySQL does not support default value constraints.');
    }

    /**
     * Creates a query builder for the MySQL database.
     *
     * @return QueryBuilder query builder instance
     */
    public function createQueryBuilder(): QueryBuilder
    {
        return new QueryBuilder($this->getDb());
        return new QueryBuilder(/** @scrutinizer ignore-type */ $this->getDb());
    }

    /**
     * Resolves the table name and schema name (if any).
     *
     * @param TableSchema $table the table metadata object.
     * @param string $name the table name.
     */
    protected function resolveTableNames($table, $name): void
    {
        $parts = \explode('.', \str_replace('`', '', $name));

        if (isset($parts[1])) {
            $table->schemaName($parts[0]);
            $table->name($parts[1]);
            $table->fullName($table->getSchemaName() . '.' . $table->getName());
        } else {
            $table->name($parts[0]);
            $table->fullName($parts[0]);
        }
    }

    /**
     * Loads the column information into a {@see ColumnSchema} object.
     *
     * @param array $info column information.
     *
     * @return ColumnSchema the column schema object.
     */
    protected function loadColumnSchema(array $info): ColumnSchema
    {
        $column = $this->createColumnSchema();

        $column->name($info['field']);
        $column->allowNull($info['null'] === 'YES');
        $column->primaryKey(\strpos($info['key'], 'PRI') !== false);
        $column->autoIncrement(\stripos($info['extra'], 'auto_increment') !== false);
        $column->comment($info['comment']);
        $column->dbType($info['type']);
        $column->unsigned(\stripos($column->getDbType(), 'unsigned') !== false);
        $column->type(self::TYPE_STRING);

        if (\preg_match('/^(\w+)(?:\(([^)]+)\))?/', $column->getDbType(), $matches)) {
            $type = \strtolower($matches[1]);
            if (isset($this->typeMap[$type])) {
                $column->type($this->typeMap[$type]);
            }
            if (!empty($matches[2])) {
                if ($type === 'enum') {
                    \preg_match_all("/'[^']*'/", $matches[2], $values);
                    foreach ($values[0] as $i => $value) {
                        $values[$i] = \trim($value, "'");
                    }
                    $column->enumValues($values);
                } else {
                    $values = \explode(',', $matches[2]);
                    $column->precision((int) $values[0]);
                    $column->size((int) $values[0]);
                    if (isset($values[1])) {
                        $column->scale((int) $values[1]);
                    }
                    if ($column->getSize() === 1 && $type === 'bit') {
                        $column->type('boolean');
                    } elseif ($type === 'bit') {
                        if ($column->getSize() > 32) {
                            $column->type('bigint');
                        } elseif ($column->getSize() === 32) {
                            $column->type('integer');
                        }
                    }
                }
            }
        }

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

        if (!$column->isPrimaryKey()) {
            /**
             * When displayed in the INFORMATION_SCHEMA.COLUMNS table, a default CURRENT TIMESTAMP is displayed
             * as CURRENT_TIMESTAMP up until MariaDB 10.2.2, and as current_timestamp() from MariaDB 10.2.3.
             *
             * See details here: https://mariadb.com/kb/en/library/now/#description
             */
            if (
                ($column->getType() === 'timestamp' || $column->getType() === 'datetime')
                && \preg_match('/^current_timestamp(?:\(([0-9]*)\))?$/i', (string) $info['default'], $matches)
            ) {
                $column->defaultValue(new Expression('CURRENT_TIMESTAMP' . (!empty($matches[1])
                    ? '(' . $matches[1] . ')' : '')));
            } elseif (isset($type) && $type === 'bit') {
                $column->defaultValue(\bindec(\trim((string) $info['default'], 'b\'')));
            } else {
                $column->defaultValue($column->phpTypecast($info['default']));
            }
        }

        return $column;
    }

    /**
     * Collects the metadata of table columns.
     *
     * @param TableSchema $table the table metadata.
     *
     * @throws \Exception if DB query fails.
     *
     * @return bool whether the table exists in the database.
     */
    protected function findColumns($table): bool
    {
        $sql = 'SHOW FULL COLUMNS FROM ' . $this->quoteTableName($table->getFullName());
        $sql = 'SHOW FULL COLUMNS FROM ' . $this->quoteTableName(/** @scrutinizer ignore-type */ $table->getFullName());

        try {
            $columns = $this->getDb()->createCommand($sql)->queryAll();
        } catch (\Exception $e) {
            $previous = $e->getPrevious();

            if ($previous instanceof \PDOException && strpos($previous->getMessage(), 'SQLSTATE[42S02') !== false) {
                /**
                 * table does not exist.
                 *
                 * https://dev.mysql.com/doc/refman/5.5/en/error-messages-server.html#error_er_bad_table_error
                 */
                return false;
            }

            throw $e;
        }

        foreach ($columns as $info) {
            if ($this->getDb()->getSlavePdo()->getAttribute(\PDO::ATTR_CASE) !== \PDO::CASE_LOWER) {
                $info = \array_change_key_case($info, CASE_LOWER);
            }

            $column = $this->loadColumnSchema($info);
            $table->columns($column->getName(), $column);

            if ($column->isPrimaryKey()) {
                $table->primaryKey($column->getName());
                if ($column->isAutoIncrement()) {
                    $table->sequenceName('');
                }
            }
        }

        return true;
    }

    /**
     * Gets the CREATE TABLE sql string.
     *
     * @param TableSchema $table the table metadata.
     *
     * @throws Exception
     * @throws InvalidArgumentException
     * @throws InvalidConfigException
     *
     * @return string $sql the result of 'SHOW CREATE TABLE'.
     */
    protected function getCreateTableSql($table): string
    {
        $row = $this->getDb()->createCommand(
            'SHOW CREATE TABLE ' . $this->quoteTableName($table->getFullName())
            'SHOW CREATE TABLE ' . $this->quoteTableName(/** @scrutinizer ignore-type */ $table->getFullName())
        )->queryOne();

        if (isset($row['Create Table'])) {
            $sql = $row['Create Table'];
        } else {
            $row = \array_values($row);
            $row = \array_values(/** @scrutinizer ignore-type */ $row);
            $sql = $row[1];
        }

        return $sql;
    }

    /**
     * Collects the foreign key column details for the given table.
     *
     * @param TableSchema $table the table metadata.
     *
     * @throws \Exception
     */
    protected function findConstraints($table)
    {
        $sql = <<<'SQL'
SELECT
    kcu.constraint_name,
    kcu.column_name,
    kcu.referenced_table_name,
    kcu.referenced_column_name
FROM information_schema.referential_constraints AS rc
JOIN information_schema.key_column_usage AS kcu ON
    (
        kcu.constraint_catalog = rc.constraint_catalog OR
        (kcu.constraint_catalog IS NULL AND rc.constraint_catalog IS NULL)
    ) AND
    kcu.constraint_schema = rc.constraint_schema AND
    kcu.constraint_name = rc.constraint_name
WHERE rc.constraint_schema = database() AND kcu.table_schema = database()
AND rc.table_name = :tableName AND kcu.table_name = :tableName1
SQL;

        try {
            $rows = $this->getDb()->createCommand(
                $sql,
                [':tableName' => $table->getName(), ':tableName1' => $table->getName()]
            )->queryAll();

            $constraints = [];

            foreach ($rows as $row) {
                $constraints[$row['constraint_name']]['referenced_table_name'] = $row['referenced_table_name'];
                $constraints[$row['constraint_name']]['columns'][$row['column_name']] = $row['referenced_column_name'];
            }

            $table->foreignKeys([]);

            foreach ($constraints as $name => $constraint) {
                $table->foreignKey($name, \array_merge(
                    [$constraint['referenced_table_name']],
                    $constraint['columns']
                ));
            }
        } catch (\Exception $e) {
            $previous = $e->getPrevious();

            if (!$previous instanceof \PDOException || \strpos($previous->getMessage(), 'SQLSTATE[42S02') === false) {
                throw $e;
            }

            // table does not exist, try to determine the foreign keys using the table creation sql
            $sql = $this->getCreateTableSql($table);
            $regexp = '/FOREIGN KEY\s+\(([^\)]+)\)\s+REFERENCES\s+([^\(^\s]+)\s*\(([^\)]+)\)/mi';

            if (\preg_match_all($regexp, $sql, $matches, PREG_SET_ORDER)) {
                foreach ($matches as $match) {
                    $fks = array_map('trim', \explode(',', \str_replace('`', '', $match[1])));
                    $pks = array_map('trim', \explode(',', \str_replace('`', '', $match[3])));
                    $constraint = [\str_replace('`', '', $match[2])];

                    foreach ($fks as $k => $name) {
                        $constraint[$name] = $pks[$k];
                    }

                    $table->foreignKey(\md5(\serialize($constraint)), $constraint);
                }
                $table->foreignKeys(\array_values($table->getForeignKeys()));
            }
        }
    }

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

        $uniqueIndexes = [];

        $regexp = '/UNIQUE KEY\s+\`(.+)\`\s*\((\`.+\`)+\)/mi';

        if (\preg_match_all($regexp, $sql, $matches, PREG_SET_ORDER)) {
            foreach ($matches as $match) {
                $indexName = $match[1];
                $indexColumns = \array_map('trim', \explode('`,`', \trim($match[2], '`')));
                $uniqueIndexes[$indexName] = $indexColumns;
            }
        }

        return $uniqueIndexes;
    }

    public function createColumnSchemaBuilder($type, $length = null)
    {
        return new ColumnSchemaBuilder($type, $length, $this->getDb());
    }

    /**
     * @throws InvalidConfigException
     * @throws Exception
     *
     * @return bool whether the version of the MySQL being used is older than 5.1.
     */
    protected function isOldMysql(): bool
    {
        if ($this->oldMysql === null) {
            $version = $this->getDb()->getSlavePdo()->getAttribute(\PDO::ATTR_SERVER_VERSION);

            $this->oldMysql = \version_compare($version, '5.1', '<=');
        }

        return $this->oldMysql;
    }

    /**
     * Loads multiple types of constraints and returns the specified ones.
     *
     * @param string $tableName table name.
     * @param string $returnType return type:
     * - primaryKey
     * - foreignKeys
     * - uniques
     *
     * @throws Exception
     * @throws InvalidArgumentException
     * @throws InvalidConfigException
     *
     * @return mixed constraints.
     */
    private function loadTableConstraints(string $tableName, string $returnType)
    {
        static $sql = <<<'SQL'
SELECT
    `kcu`.`CONSTRAINT_NAME` AS `name`,
    `kcu`.`COLUMN_NAME` AS `column_name`,
    `tc`.`CONSTRAINT_TYPE` AS `type`,
    CASE
        WHEN :schemaName IS NULL AND `kcu`.`REFERENCED_TABLE_SCHEMA` = DATABASE() THEN NULL
        ELSE `kcu`.`REFERENCED_TABLE_SCHEMA`
    END AS `foreign_table_schema`,
    `kcu`.`REFERENCED_TABLE_NAME` AS `foreign_table_name`,
    `kcu`.`REFERENCED_COLUMN_NAME` AS `foreign_column_name`,
    `rc`.`UPDATE_RULE` AS `on_update`,
    `rc`.`DELETE_RULE` AS `on_delete`,
    `kcu`.`ORDINAL_POSITION` AS `position`
FROM
    `information_schema`.`KEY_COLUMN_USAGE` AS `kcu`,
    `information_schema`.`REFERENTIAL_CONSTRAINTS` AS `rc`,
    `information_schema`.`TABLE_CONSTRAINTS` AS `tc`
WHERE
    `kcu`.`TABLE_SCHEMA` = COALESCE(:schemaName, DATABASE()) AND `kcu`.`CONSTRAINT_SCHEMA` = `kcu`.`TABLE_SCHEMA` AND `kcu`.`TABLE_NAME` = :tableName
    AND `rc`.`CONSTRAINT_SCHEMA` = `kcu`.`TABLE_SCHEMA` AND `rc`.`TABLE_NAME` = :tableName AND `rc`.`CONSTRAINT_NAME` = `kcu`.`CONSTRAINT_NAME`
    AND `tc`.`TABLE_SCHEMA` = `kcu`.`TABLE_SCHEMA` AND `tc`.`TABLE_NAME` = :tableName AND `tc`.`CONSTRAINT_NAME` = `kcu`.`CONSTRAINT_NAME` AND `tc`.`CONSTRAINT_TYPE` = 'FOREIGN KEY'
UNION
SELECT
    `kcu`.`CONSTRAINT_NAME` AS `name`,
    `kcu`.`COLUMN_NAME` AS `column_name`,
    `tc`.`CONSTRAINT_TYPE` AS `type`,
    NULL AS `foreign_table_schema`,
    NULL AS `foreign_table_name`,
    NULL AS `foreign_column_name`,
    NULL AS `on_update`,
    NULL AS `on_delete`,
    `kcu`.`ORDINAL_POSITION` AS `position`
FROM
    `information_schema`.`KEY_COLUMN_USAGE` AS `kcu`,
    `information_schema`.`TABLE_CONSTRAINTS` AS `tc`
WHERE
    `kcu`.`TABLE_SCHEMA` = COALESCE(:schemaName, DATABASE()) AND `kcu`.`TABLE_NAME` = :tableName
    AND `tc`.`TABLE_SCHEMA` = `kcu`.`TABLE_SCHEMA` AND `tc`.`TABLE_NAME` = :tableName AND `tc`.`CONSTRAINT_NAME` = `kcu`.`CONSTRAINT_NAME` AND `tc`.`CONSTRAINT_TYPE` IN ('PRIMARY KEY', 'UNIQUE')
ORDER BY `position` ASC
SQL;

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

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

        $constraints = $this->normalizePdoRowKeyCase($constraints, true);
        $constraints = ArrayHelper::index($constraints, null, ['type', 'name']);

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

        foreach ($constraints as $type => $names) {
            foreach ($names as $name => $constraint) {
                switch ($type) {
                    case 'PRIMARY KEY':
                        $ct = (new Constraint())
                            ->columnNames(ArrayHelper::getColumn($constraint, 'column_name'));

                        $result['primaryKey'] = $ct;

                        break;
                    case 'FOREIGN KEY':
                        $fk = (new ForeignKeyConstraint())
                            ->name($name)
                            ->columnNames(ArrayHelper::getColumn($constraint, 'column_name'))
                            ->foreignSchemaName($constraint[0]['foreign_table_schema'])
                            ->foreignTableName($constraint[0]['foreign_table_name'])
                            ->foreignColumnNames(ArrayHelper::getColumn($constraint, 'foreign_column_name'))
                            ->onDelete($constraint[0]['on_delete'])
                            ->onUpdate($constraint[0]['on_update']);

                        $result['foreignKeys'][] = $fk;

                        break;
                    case 'UNIQUE':
                        $ct = (new Constraint())
                            ->name($name)
                            ->columnNames(ArrayHelper::getColumn($constraint, 'column_name'));

                        $result['uniques'][] = $ct;

                        break;
                }
            }
        }

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

        return $result[$returnType];
    }

    /**
     * Creates a column schema for the database.
     *
     * This method may be overridden by child classes to create a DBMS-specific column schema.
     *
     * @return ColumnSchema column schema instance.
     */
    protected function createColumnSchema(): ColumnSchema
    {
        return new ColumnSchema();
    }
}

yiisoft / db-mysql

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Schema::findUniqueIndexes() A

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