QLExpress递归表达

本文章介绍运用QLExpress脚本语言进行递归运算，请看下面举的例子，代码如下：

public class RecursivelyTest {
    private static final ExpressRunner runner = new ExpressRunner();
    private static final ExpressRunner runnerInner = new ExpressRunner();

    static {
        Operator exeOperator = new Operator() {
            @Override
            public Object executeInner(Object[] list) throws Exception {
                System.out.println("executeInner:r_exeAll");
                IExpressContext context = new DefaultContext<>();
                runnerInner.execute("1+2", context, null, false, true);
                System.out.println(list[0]);
                return null;
            }
        };

        runner.addFunction("r_exeAll", exeOperator);
        runnerInner.addFunction("r_exeAll", exeOperator);
    }

这段代码添加新方法，目的是为下面的测试做准备，请看测试用例：

@Test
    public void testAllByFunction() throws Exception {
        String exp = "r_exeAll(1,2,3)";
        IExpressContext context = new DefaultContext<>();
        runner.execute(exp, context, null, false, true);
    }

这里进行了上面的方法调用，即进行了一次递归运算，测试结果如下：

测试通过！