Add DUMP DATABASE command to export database as SQL script

[Copilot]

Description

Implements DUMP and DUMP DATABASE commands to export database schema and data as executable SQL script, equivalent to SQLite's .dump or MySQL's mysqldump.

Changes

• Parser: Added DUMP token and grammar rules to alasqlparser.jison
• Implementation: Created src/79dump.js with DumpDatabase class
  • Generates CREATE TABLE statements from table schemas
  • Generates INSERT statements from table data
  • Handles NULL values (including NaN for numeric columns), undefined values, and string escaping
  • Supports DUMP (current database) and DUMP DATABASE dbname (specific database)
• Build: Added source file to build.sh concatenation list
• Tests: Added test/test110-B.js with 8 test cases with complete output assertions covering edge cases including NULL handling and quote escaping

Usage

// Export current database
var sql = alasql('DUMP');

// Export specific database  
var sql = alasql('DUMP DATABASE mybase');

// Restore from dump
alasql('CREATE DATABASE restored');
alasql('USE restored');
alasql(sql);

Output example:

CREATE TABLE users (id INT, name STRING, email STRING);
INSERT INTO users(id,name,email) VALUES (1,'Alice','[email protected]');
INSERT INTO users(id,name,email) VALUES (2,'Bob','[email protected]');
INSERT INTO users(id,name,email) VALUES (NULL,'Charlie',NULL);

Testing

• ✅ All 8 tests pass with complete output assertions
• ✅ NULL values (including NaN) correctly output as NULL in SQL
• ✅ String escaping works correctly (e.g., Val's Diner → 'Val''s Diner')
• ✅ Database can be successfully restored from dump output
• ✅ Build process completes successfully

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Export database as SQL script</issue_title>
<issue_description>SQLite have .dump command, MySQL have special tool mysqldump. Do you have something similar?
</issue_description>

<agent_instructions>Name the test file test/test110-B.js</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@agershun Sorry, not yet.

There are some command to dump data to SQL:

    SELECT * INTO SQL("mydata.sql") FROM one;

and

    SHOW CREATE TABLE one;

But not whole database.

@agershun What do you thing, what approach llisted below is better?

a) to have dump command for specific database, like:

    var sql = alasql('DUMP DATABASE mybase');

b) dump all databases in current alasql object:

    var sql = alasql('DUMP');

@mathiasrw Another solution (not involving making new "SQL" things) would be to extend the alasql object with a dump method

var sql = alasql().dump();

Should work on both alasql and objects created from new alasql

@agershun I think it is a good idea to minimize alasql() interface, because in case of `alasql.dump()` we need to maintain this additional function in WebWorker version (alasql-worker.js), but in case of `res = alasql('DUMP');` or `res = alasql('DUMP DATABASE mybase');`` Alasql will use the same version.

Of course, alasql.dump() can be accessible as a function outside, but only for non-worker version.

@mathiasrw > What do you thing, what approach llisted below is better? > > a) to have dump command for specific database, like: > > ``` > var sql = alasql('DUMP DATABASE mybase'); > ``` > > b) dump all databases in current alasql object: > > ``` > var sql = alasql('DUMP'); > ```

I like it. I have added it to the feature requests

http://feathub.com/agershun/alasql/+25

• Fixes Export database as SQL script #110

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[mathiasrw]

Please remove

[Copilot]

Done. Removed copyright header in commit 17e4c67.

[mathiasrw]

For all the tests, please assert the specific complete output we expect.

[Copilot]

Done. Updated all tests to assert complete expected output instead of partial includes. Also fixed NaN handling for NULL numeric values. Commit 17e4c67.