feat: show table definition (#3061)

* feat: show table definition

* chore: test

packages/core/database/src/query-interface/mysql-query-interface.ts

@@ -76,4 +76,14 @@ export default class MysqlQueryInterface extends QueryInterface {
     const sql = match[0];
     return sql;
   }
+
+  async showTableDefinition(tableInfo: { name: string; schema?: string }): Promise<any> {
+    const { name } = tableInfo;
+
+    const sql = `SHOW CREATE TABLE ${name}`;
+
+    const results = await this.db.sequelize.query(sql, { type: 'SELECT' });
+
+    return results[0]['Create Table'];
+  }
 }

packages/core/database/src/query-interface/postgres-query-interface.ts

@@ -112,4 +112,34 @@ export default class PostgresQueryInterface extends QueryInterface {
       return {};
     }
   }
+
+  async showTableDefinition(tableInfo: { name: string; schema?: string }) {
+    const showFunc = `
+CREATE OR REPLACE FUNCTION show_create_table(p_schema text, p_table_name text)
+RETURNS text AS
+$BODY$
+SELECT 'CREATE TABLE ' || p_schema || '.' || p_table_name || ' (' || E'\\n' || '' ||
+    string_agg(column_list.column_expr, ', ' || E'\\n' || '') ||
+    '' || E'\\n' || ');'
+FROM (
+  SELECT '    ' || column_name || ' ' || data_type ||
+       coalesce('(' || character_maximum_length || ')', '') ||
+       case when is_nullable = 'YES' then '' else ' NOT NULL' end as column_expr
+  FROM information_schema.columns
+  WHERE table_schema = p_schema AND table_name = p_table_name
+  ORDER BY ordinal_position) column_list;
+$BODY$
+  LANGUAGE SQL STABLE;
+    `;
+    await this.db.sequelize.query(showFunc, { type: 'RAW' });
+
+    const res = await this.db.sequelize.query(
+      `SELECT show_create_table('${tableInfo.schema}', '${tableInfo.name || 'public'}')`,
+      {
+        type: 'SELECT',
+      },
+    );
+
+    return res[0]['show_create_table'];
+  }
 }

packages/core/database/src/query-interface/query-interface.ts

@@ -25,6 +25,8 @@ export default abstract class QueryInterface {
 
   abstract parseSQL(sql: string): any;
 
+  abstract showTableDefinition(tableInfo: { name: string; schema?: string }): Promise<any>;
+
   async dropAll(options) {
     if (options.drop !== true) return;
 

packages/core/database/src/query-interface/sqlite-query-interface.ts

@@ -86,4 +86,8 @@ export default class SqliteQueryInterface extends QueryInterface {
 
     return sql;
   }
+
+  showTableDefinition(tableInfo: { name: string; schema?: string }): Promise<any> {
+    return Promise.resolve(undefined);
+  }
 }