HSQL:创建索引(如果不存在)

我正在使用Spring通过

I'm initializing a HSQL database 2.2.9 via Spring using

<jdbc:initialize-database enabled="true">
    <jdbc:script execution="INIT" location="classpath:./create-tables.sql"/>
</jdbc:initialize-database>

在create-tables.sql我使用

CREATE TABLE IF NOT EXISTS MyTable(...);

该表还具有索引.我正在寻找比总是删除和创建索引更好的方法.

The table also has an index. I'm looking for a better way than always dropping and creating the index.

我尝试过:

CREATE INDEX IF NOT EXISTS myIndex ...;

• 不起作用

我可以创建一个函数indexExisting()，如果找到索引，但是如果我写的话，将检查系统表并返回count(*)> 0

I can create a function indexExisting() checking the system tables and returning count(*) > 0 if the index is found, but if I write

IF indexExisting() = 0 THEN ...

直接进入.sql文件，

java.sql.SQLSyntaxErrorException: unexcepted token: IF

据我所知，存储过程似乎也无济于事，因为它们可能不包含DROP语句.

Also a stored procedure does not seem to help, as they may not contain DROP statements, as far as I read.

因此，除了删除/创建索引以外的解决方案也将受到欢迎.

So a solution other than dropping / creating the index would be appreciated.

谢谢