如何在SQL Anywhere中创建动态存储过程？

Question

我在创建SQL Anywhere中的动态sql语句时遇到问题。

CREATE PROCEDURE pplAnalysis 
AS 
BEGIN 

    DECLARE @Sql NVARCHAR(4000) 

    SELECT @Sql = "select * from cds.ppl" 

    EXECUTE(@Sql) 

END 

当我执行此过程中，我得到一个Column 'select * from cds.ppl' not found错误。

你能告诉我我做错了什么吗？

Answer 1

使用单引号。

SELECT @Sql = 'select * from cds.ppl' 

Answer 2

经过一番研究，我编辑了我的答案。

关于EXECUTE (string-expression)声明，是的，您必须为字符串表达式使用单引号而不是双引号。 This页提到：

It lets you execute dynamically prepared statements, such as statements that are constructed using the parameters passed in to a procedure. Literal strings in the statement must be enclosed in single quotes, and the statement must be on a single line.

这将消除列没有发现错误，但过程将返回此其他错误：试图执行仅此语句时

Result set not permitted in '<batch statement>' 

同样的错误返回：

execute ('select * from sysusers') 

With probable cause：

You attempted to execute a SELECT statement in a context where a result set is not permitted.

看到我最近的解决方案的答案。

和关于架构，这里是如何引用对象：

It is always good practice to refer to database objects by a schema name and the object name, separated by a period (.). For a complete example, to SELECT records from the Employee table in the HumanResources schema of the current database would look like:

SELECT * FROM HumanResources.Employee 

To reference an object located in a remote database, the fully qualified object name includes the server name and the database name. For example, to SELECT records from the Employee table in the HumanResources schema in the AdventureWorks database on MyServer would look like:

SELECT * FROM MyServer.AdventureWorks.HumanResources.Employee 

我测试了在SQL Anywhere中12和它的工作原理是相同的。虽然我不熟悉的模式，就是我建议你下面是实际使用的模式，会的dbowner是架构名称：

1）select * from dbname.dbowner.tablename

2）select * from dbowner.tablename

3）select * from dbname..tablename （假设表中dbo模式存在）

底线....在SELECT语句cds.ppl必须是一个名为在cds模式中创建ppl表。

或者，如果cds是你的数据库名称和dbo模式中创建ppl你的表名，你缺少一个点：

select * from cds..ppl 

Answer 3

问题曾与语法和RESULT条款做;在添加分号，RESULT子句并使用SET初始化Sql变量之后，以下是工作原理（在SQL Anywhere网络服务器版本12.0中进行了测试）。1）：

drop proc pplAnalysis; 

CREATE PROCEDURE pplAnalysis() 
RESULT (cnot CHAR(5), cnull CHAR(5), vnot VARCHAR(5), vnull VARCHAR(5), explanation VARCHAR(50)) 
BEGIN 

    DECLARE @Sql NVARCHAR(4000); 

    SET @Sql = 'select cnot, cnull, vnot, vnull, explanation from dbo.spaces'; 

    EXECUTE (@Sql); 

END; 

spaces是一个表，在dbo模式和这些列是在RESULT

指定的相同类型测试这两个执行该过程和两个返回的结果的方法：

call pplAnalysis(); 

cnot cnull vnot vnull explanation           
----- ----- ----- ----- -------------------------------------------------- 
Execution time: 0.027 seconds 
Procedure completed 

或

exec pplAnalysis; 

cnot cnull vnot vnull explanation           
----- ----- ----- ----- -------------------------------------------------- 
Execution time: 0.018 seconds 

˚F或更多的细节：

Returning result sets from procedures

Create procedure statement

Answer 4

尝试先保存在一个时间表的查询结果，然后从时态表做SELECT：

SELECT @Sql = "select into #temp * from cds.ppl" 

EXECUTE(@Sql) 

SELECT * FROM #temp