File size: 5,674 Bytes
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* Project Database Manager
*
* Lightweight per-project SQLite database for user-defined tables.
* No system tables — just user DDL/SQL.
*
* Project databases live at data/projects/{projectId}/database.sqlite
* and are extracted to deployment runtime.sqlite on publish.
*/
import type { Database } from 'better-sqlite3';
import { TableInfo } from '../types';
import {
getProjectDatabaseConnection,
closeProjectDatabase,
} from './sqlite-connection';
/**
* Escape a table name for use in SQL identifiers (double-quote escaping)
*/
function escapeIdentifier(name: string): string {
return `"${name.replace(/"/g, '""')}"`;
}
/**
* Per-project database manager
*/
export class ProjectDatabase {
private db: Database;
private projectId: string;
private baseDir: string | undefined;
constructor(projectId: string, baseDir?: string) {
this.projectId = projectId;
this.baseDir = baseDir;
this.db = getProjectDatabaseConnection(projectId, baseDir);
}
/**
* Initialize — no-op, exists for interface symmetry with RuntimeDatabase
*/
init(): void {
// No system tables to create
}
/**
* Close the database connection
*/
close(): void {
closeProjectDatabase(this.projectId, this.baseDir);
}
/**
* Execute DDL statements (CREATE TABLE, etc.)
*/
private static readonly BLOCKED_PATTERNS = /^\s*(ATTACH|DETACH|PRAGMA|VACUUM)\b/i;
executeDDL(sql: string): void {
const statements = sql.split(';').filter(s => s.trim());
for (const stmt of statements) {
if (ProjectDatabase.BLOCKED_PATTERNS.test(stmt.trim())) {
throw new Error('Statement type not allowed');
}
}
this.db.exec(sql);
}
/**
* Get schema information for all tables
*/
getTableSchema(): TableInfo[] {
const tables = this.db.prepare(`
SELECT name FROM sqlite_master
WHERE type = 'table' AND name NOT LIKE 'sqlite_%'
ORDER BY name
`).all() as Array<{ name: string }>;
return tables.map(table => {
const escaped = escapeIdentifier(table.name);
const columns = this.db.prepare(`PRAGMA table_info(${escaped})`).all() as Array<{
cid: number;
name: string;
type: string;
notnull: number;
dflt_value: string | null;
pk: number;
}>;
const countResult = this.db.prepare(`SELECT COUNT(*) as count FROM ${escaped}`).get() as { count: number };
return {
name: table.name,
columns: columns.map(col => ({
name: col.name,
type: col.type,
nullable: !col.notnull,
primaryKey: col.pk > 0,
defaultValue: col.dflt_value ?? undefined,
})),
rowCount: countResult.count,
isSystemTable: false,
};
});
}
/**
* Execute raw SQL (SELECT or DML)
*/
executeRawSQL(sql: string, params?: unknown[]): {
columns: string[];
rows: unknown[][];
rowsAffected: number;
} {
if (ProjectDatabase.BLOCKED_PATTERNS.test(sql)) {
throw new Error('Statement type not allowed');
}
const trimmedSql = sql.trim().toLowerCase();
const isSelect = trimmedSql.startsWith('select');
if (isSelect) {
const stmt = this.db.prepare(sql);
const rows = params ? stmt.all(...params) : stmt.all();
if (rows.length === 0) {
return { columns: [], rows: [], rowsAffected: 0 };
}
const columns = Object.keys(rows[0] as Record<string, unknown>);
const rowsArray = rows.map(row => columns.map(col => (row as Record<string, unknown>)[col]));
return { columns, rows: rowsArray, rowsAffected: 0 };
} else {
const stmt = this.db.prepare(sql);
const result = params ? stmt.run(...params) : stmt.run();
return {
columns: [],
rows: [],
rowsAffected: result.changes,
};
}
}
/**
* Get data from a specific table with pagination
*/
getTableData(tableName: string, limit: number = 100, offset: number = 0): {
columns: string[];
rows: unknown[][];
total: number;
} {
const validTables = this.db.prepare(`
SELECT name FROM sqlite_master WHERE type = 'table' AND name = ?
`).get(tableName);
if (!validTables) {
throw new Error(`Table "${tableName}" does not exist`);
}
const escaped = escapeIdentifier(tableName);
const countResult = this.db.prepare(`SELECT COUNT(*) as count FROM ${escaped}`).get() as { count: number };
const rows = this.db.prepare(`SELECT * FROM ${escaped} LIMIT ? OFFSET ?`).all(limit, offset) as Record<string, unknown>[];
if (rows.length === 0) {
return { columns: [], rows: [], total: countResult.count };
}
const columns = Object.keys(rows[0]);
const rowsArray = rows.map(row => columns.map(col => row[col]));
return {
columns,
rows: rowsArray,
total: countResult.count,
};
}
/**
* Generate schema SQL from sqlite_master for export/extraction.
* Uses the original DDL stored by SQLite — preserves AUTOINCREMENT,
* FOREIGN KEY, CHECK constraints, and indexes.
*/
getSchemaForExport(): string {
const tables = this.db.prepare(`
SELECT sql FROM sqlite_master
WHERE type = 'table' AND name NOT LIKE 'sqlite_%' AND sql IS NOT NULL
ORDER BY name
`).all() as Array<{ sql: string }>;
const indexes = this.db.prepare(`
SELECT sql FROM sqlite_master
WHERE type = 'index' AND sql IS NOT NULL
ORDER BY name
`).all() as Array<{ sql: string }>;
if (tables.length === 0) {
return '';
}
return [...tables, ...indexes].map(r => r.sql + ';').join('\n\n') + '\n';
}
}
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