import { Connection } from "../connection/Connection";
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import { SchemaBuilder } from "./SchemaBuilder";
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import { SqlInMemory } from "../driver/SqlInMemory";
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/**
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* Creates complete tables schemas in the database based on the entity metadatas.
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*
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* Steps how schema is being built:
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* 1. load list of all tables with complete column and keys information from the db
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* 2. drop all (old) foreign keys that exist in the table, but does not exist in the metadata
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* 3. create new tables that does not exist in the db, but exist in the metadata
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* 4. drop all columns exist (left old) in the db table, but does not exist in the metadata
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* 5. add columns from metadata which does not exist in the table
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* 6. update all exist columns which metadata has changed
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* 7. update primary keys - update old and create new primary key from changed columns
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* 8. create foreign keys which does not exist in the table yet
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* 9. create indices which are missing in db yet, and drops indices which exist in the db, but does not exist in the metadata anymore
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*/
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export declare class MongoSchemaBuilder implements SchemaBuilder {
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protected connection: Connection;
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constructor(connection: Connection);
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/**
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* Creates complete schemas for the given entity metadatas.
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*/
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build(): Promise<void>;
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/**
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* Returns query to be executed by schema builder.
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*/
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log(): Promise<SqlInMemory>;
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}
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