How do you check if a table exists with slick 3.0?
如何检查表格是否存在光滑的3.0？
There was a way in previous versions of slick by using:
以前的版本中有一种方法可以使用：
MTable.getTables.list()
But this doesn't compile anymore.
但这不再编译了。
The idea behind this question is to dynamically create a table when it doesn't exists, pretty much like this:
这个问题背后的想法是在它不存在时动态创建一个表，非常像这样：
if (Tables.contains("USERS") == false)
Users.createTable()
1 个解决方案
#1
15
With Slick 3.0 MTable.getTables is a DBAction which was to be run via a Database instance:
使用Slick 3.0 MTable.getTables是一个DBAction，它将通过Database实例运行：
val tables = Await.result(db.run(MTable.getTables), 1.seconds).toList
Of course, you should probable deal with the Future returned by db.run in an asynchronous manner (via map or for-comprehension) rather than blocking on it as I did for the example.
当然，你应该以异步方式（通过map或for-comprehension）处理db.run返回的Future，而不是像我为这个例子那样阻塞它。
#1
15
With Slick 3.0 MTable.getTables is a DBAction which was to be run via a Database instance:
使用Slick 3.0 MTable.getTables是一个DBAction，它将通过Database实例运行：
val tables = Await.result(db.run(MTable.getTables), 1.seconds).toList
Of course, you should probable deal with the Future returned by db.run in an asynchronous manner (via map or for-comprehension) rather than blocking on it as I did for the example.
当然，你应该以异步方式（通过map或for-comprehension）处理db.run返回的Future，而不是像我为这个例子那样阻塞它。