AsyncPipe; table schemata; migrations; File logging

src/orm/schema/Schema.ts

@@ -1,14 +1,51 @@
 import {Connection} from '../connection/Connection'
 import {Awaitable} from '../../util'
+import {TableBuilder} from './TableBuilder'
 
+/**
+ * Represents a SQL-schema implementation.
+ */
 export abstract class Schema {
     constructor(
+        /** The SQL connection to execute against. */
         protected readonly connection: Connection,
     ) { }
 
+    /**
+     * Resolve true if the schema has a table with the given name.
+     * @param name
+     */
     public abstract hasTable(name: string): Awaitable<boolean>
 
+    /**
+     * Resolve true if the schema table with the given name has a column with the given name.
+     * @param table
+     * @param name
+     */
     public abstract hasColumn(table: string, name: string): Awaitable<boolean>
 
+    /**
+     * Resolve true if the schema table with the given name has all the specified columns.
+     * @param table
+     * @param name
+     */
     public abstract hasColumns(table: string, name: string[]): Awaitable<boolean>
+
+    /**
+     * Get a TableBuilder instance for a table on the schema.
+     * @param table
+     */
+    public abstract table(table: string): Awaitable<TableBuilder>
+
+    /**
+     * Apply the table to the schema.
+     * @param schema
+     */
+    public async commit(schema: TableBuilder): Promise<void> {
+        const query = this.connection
+            .dialect()
+            .renderCommitSchemaTransaction(schema)
+
+        await this.connection.query(query)
+    }
 }