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- 4种存储引擎：Memory / IndexedDB / OPFS / Hybrid - 完整SQL支持：SELECT/INSERT/UPDATE/DELETE/JOIN/GROUP BY/HAVING/DISTINCT - Query Builder链式API + TypeScript泛型支持 - 聚合函数：COUNT/SUM/AVG/MIN/MAX - 事务、插件系统(14 hooks)、发布订阅、数据迁移、导入导出 - React/Vue框架集成 - 264个测试用例，93.46%覆盖率 - 零运行时依赖
58 lines
1.6 KiB
TypeScript
58 lines
1.6 KiB
TypeScript
/**
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* metona-sqlark Query Compiler — AST → 查询计划
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* @module query/compiler
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*
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* 将 AST 语句编译为引擎可执行的 QueryPlan。
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* v0.0.1: 简单直接映射，未来可加入索引选择、过滤下推等优化。
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*/
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import type { QueryPlan } from '../constants';
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import { DatabaseError } from '../constants';
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import type { Statement, SelectStatement, DeleteStatement, UpdateStatement } from './ast';
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// ---------------------------------------------------------------------------
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// 编译 AST → QueryPlan
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// ---------------------------------------------------------------------------
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/**
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* 编译 SELECT / DELETE / UPDATE 语句为 QueryPlan。
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* INSERT 和 DDL 语句不需要 QueryPlan。
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*/
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export function compileStatement(stmt: Statement): QueryPlan {
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switch (stmt.type) {
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case 'SELECT':
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return compileSelect(stmt);
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case 'DELETE':
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return compileDelete(stmt);
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case 'UPDATE':
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return compileUpdate(stmt);
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default:
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throw new DatabaseError(`Cannot compile statement type "${stmt.type}" to QueryPlan`, 'COMPILE_ERROR');
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}
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}
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function compileSelect(stmt: SelectStatement): QueryPlan {
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return {
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table: stmt.from,
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columns: stmt.columns,
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where: stmt.where,
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orderBy: stmt.orderBy?.length ? stmt.orderBy : undefined,
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limit: stmt.limit,
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offset: stmt.offset,
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};
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}
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function compileDelete(stmt: DeleteStatement): QueryPlan {
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return {
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table: stmt.from,
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where: stmt.where,
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};
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}
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function compileUpdate(stmt: UpdateStatement): QueryPlan {
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return {
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table: stmt.table,
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where: stmt.where,
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};
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}
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