import type { Knex } from 'knex';
import type { CheckDef, Column, IndexDef, TableDifference, Table, ForeignKey, MySqlTableBuilder } from '../../typings';
import { type Dictionary, type Type } from '@mikro-orm/core';
import type { AbstractSqlConnection } from '../../AbstractSqlConnection';
import { SchemaHelper } from '../../schema/SchemaHelper';
import type { DatabaseSchema } from '../../schema/DatabaseSchema';
import type { DatabaseTable } from '../../schema/DatabaseTable';
export declare class MySqlSchemaHelper extends SchemaHelper {
    private readonly _cache;
    static readonly DEFAULT_VALUES: {
        'now()': string[];
        'current_timestamp(?)': string[];
        '0': string[];
    };
    getSchemaBeginning(charset: string, disableForeignKeys?: boolean): string;
    disableForeignKeysSQL(): string;
    enableForeignKeysSQL(): string;
    finalizeTable(table: Knex.CreateTableBuilder, charset: string, collate?: string): void;
    getListTablesSQL(): string;
    loadInformationSchema(schema: DatabaseSchema, connection: AbstractSqlConnection, tables: Table[]): Promise<void>;
    getAllIndexes(connection: AbstractSqlConnection, tables: Table[]): Promise<Dictionary<IndexDef[]>>;
    getAllColumns(connection: AbstractSqlConnection, tables: Table[]): Promise<Dictionary<Column[]>>;
    getAllChecks(connection: AbstractSqlConnection, tables: Table[]): Promise<Dictionary<CheckDef[]>>;
    getAllForeignKeys(connection: AbstractSqlConnection, tables: Table[]): Promise<Dictionary<Dictionary<ForeignKey>>>;
    getPreAlterTable(tableDiff: TableDifference, safe: boolean): string;
    createTableColumn(table: MySqlTableBuilder, column: Column, fromTable: DatabaseTable, changedProperties?: Set<string>, alter?: boolean): Knex.ColumnBuilder | undefined;
    configureColumnDefault(column: Column, col: Knex.ColumnBuilder, knex: Knex, changedProperties?: Set<string>): Knex.ColumnBuilder;
    getRenameColumnSQL(tableName: string, oldColumnName: string, to: Column): string;
    getRenameIndexSQL(tableName: string, index: IndexDef, oldIndexName: string): string;
    getChangeColumnCommentSQL(tableName: string, to: Column, schemaName?: string): string;
    private getColumnDeclarationSQL;
    getForeignKeysSQL(tableName: string, schemaName?: string): string;
    getAllEnumDefinitions(connection: AbstractSqlConnection, tables: Table[]): Promise<Dictionary<Dictionary<string[]>>>;
    private supportsCheckConstraints;
    protected getChecksSQL(tables: Table[]): string;
    getChecks(connection: AbstractSqlConnection, tableName: string, schemaName: string, columns?: Column[]): Promise<CheckDef[]>;
    getEnumDefinitions(connection: AbstractSqlConnection, checks: CheckDef[], tableName: string, schemaName?: string): Promise<Dictionary<string[]>>;
    getColumns(connection: AbstractSqlConnection, tableName: string, schemaName?: string): Promise<Column[]>;
    getIndexes(connection: AbstractSqlConnection, tableName: string, schemaName?: string): Promise<IndexDef[]>;
    normalizeDefaultValue(defaultValue: string, length: number): string | number;
    protected wrap(val: string | null | undefined, type: Type<unknown>): string | null | undefined;
}