feat: v0.1.13 — 事务回滚 + 子查询 + 外键级联 + 连接池

src/sql/parser.ts

@@ -352,7 +352,8 @@ export class Parser {
       this.curTokenIs(TokenType.PRIMARY) ||
       this.curTokenIs(TokenType.UNIQUE) ||
       this.curTokenIs(TokenType.NOT) ||
-      this.curTokenIs(TokenType.DEFAULT)
+      this.curTokenIs(TokenType.DEFAULT) ||
+      this.curTokenIs(TokenType.REFERENCES)
     ) {
       if (this.curTokenIs(TokenType.PRIMARY)) {
         this.nextToken();
@@ -363,12 +364,31 @@ export class Parser {
         col.unique = true;
       } else if (this.curTokenIs(TokenType.NOT)) {
         this.nextToken();
-        // 支持 NOT NULL → required
         this.expect(TokenType.NULL);
         col.required = true;
       } else if (this.curTokenIs(TokenType.DEFAULT)) {
         this.nextToken();
         col.default = this.parseValue();
+      } else if (this.curTokenIs(TokenType.REFERENCES)) {
+        this.nextToken();
+        const refTable = this.expectIdentifier('referenced table');
+        this.expect(TokenType.LPAREN);
+        const refCol = this.expectIdentifier('referenced column');
+        this.expect(TokenType.RPAREN);
+        col.references = `${refTable}.${refCol}`;
+        // ON DELETE / ON UPDATE
+        while (this.curTokenIs(TokenType.ON)) {
+          this.nextToken();
+          if (this.curTokenIs(TokenType.DELETE)) {
+            this.nextToken();
+            col.onDelete = this.parseCascadeAction();
+          } else if (this.curTokenIs(TokenType.UPDATE)) {
+            this.nextToken();
+            col.onUpdate = this.parseCascadeAction();
+          } else {
+            break;
+          }
+        }
       } else {
         break;
       }
@@ -377,6 +397,25 @@ export class Parser {
     return col;
   }
 
+  /** 解析 CASCADE | SET NULL | RESTRICT */
+  private parseCascadeAction(): 'CASCADE' | 'SET NULL' | 'RESTRICT' {
+    if (this.curTokenIs(TokenType.CASCADE)) {
+      this.nextToken();
+      return 'CASCADE';
+    }
+    if (this.curTokenIs(TokenType.SET)) {
+      this.nextToken();
+      this.expect(TokenType.NULL);
+      return 'SET NULL';
+    }
+    // RESTRICT 或默认
+    if (this.curToken.type === TokenType.IDENTIFIER && this.curToken.value.toUpperCase() === 'RESTRICT') {
+      this.nextToken();
+      return 'RESTRICT';
+    }
+    return 'RESTRICT';
+  }
+
   // ===================================================================
   //  DROP TABLE
   // ===================================================================
@@ -457,6 +496,14 @@ export class Parser {
     if (this.curTokenIs(TokenType.IN)) {
       this.nextToken();
       this.expect(TokenType.LPAREN);
+      // 子查询: IN (SELECT ...)
+      if (this.curTokenIs(TokenType.SELECT)) {
+        const subquery = this.parseSelect();
+        this.expect(TokenType.RPAREN);
+        const result: WhereCondition = {};
+        result[column] = { $in: { $subquery: subquery } };
+        return result;
+      }
       const values = this.parseValueList();
       this.expect(TokenType.RPAREN);
       const result: WhereCondition = {};
@@ -467,6 +514,16 @@ export class Parser {
     // 比较运算符
     const op = this.parseComparisonOp();
 
+    // 子查询: op (SELECT ...)
+    if (this.curTokenIs(TokenType.LPAREN) && this.peekTokenIs(TokenType.SELECT)) {
+      this.nextToken(); // skip (
+      const subquery = this.parseSelect();
+      this.expect(TokenType.RPAREN);
+      const result: WhereCondition = {};
+      result[column] = { [op]: { $subquery: subquery } };
+      return result;
+    }
+
     // 尝试解析列引用（identifier DOT identifier 格式）
     let value: unknown;
     if (