因此,由于异步支持,我最近在我的Scala项目中从ScalikeJDBC移到了Quill。
是否支持任何SQL语法,例如以下示例?
INSERT INTO People (id, cityID)
SELECT 52, Cities.id
FROM Cities
WHERE Cities.name = 'New York City';
INSERT INTO State (id, numCities)
SELECT 4, COUNT(*)
FROM Cities
WHERE Cities.state = 'NY'
我会尝试类似的东西
quote {
for {
count <- query[City].filter(_.state == 'NY').size
} yield query[State].insert(lift(State(4, count))
}
quote {
query[City].filter(_.state == 'NY').size.nested.insert(count => lift(State(4, count))
}
但是它会给出如下错误:
当然,如果我做下面的事情,我会得到很多错误:
quote {
for {
count <- List(query[City].filter(_.state == 'NY').size)
} yield query[State].insert(lift(State(4, count))
}
当前唯一的解决方法似乎是在运行两个单独的查询(一个用于获取计数,第二个用于插入)。但是我认为如果我做很多基于选择的插入操作,这将变得效率低下。
我尝试使用infix等替代方法:
quote {
infix"""
INSERT INTO Languages (id,iso639_1,name)
VALUES (
(SELECT x2.id + 1
FROM (SELECT id FROM Languages UNION SELECT 0) x2
LEFT JOIN Languages x1 ON (x2.id + 1) = x1.id
WHERE x1.id IS NULL LIMIT 1),
'Hello',
'World'
);
""".as[?]
}
但是它一直在给出这些错误:
[error] (run-main-4a) com.github.mauricio.async.db.mysql.exceptions.MySQLException: Error 1064 - #42000 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INSERT INTO Languages (id,iso639_1,name)
[error] VALUES (
[error] (SELECT x2.id ' at line 2
[error] com.github.mauricio.async.db.mysql.exceptions.MySQLException: Error 1064 - #42000 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INSERT INTO Languages (id,iso639_1,name)
[error] VALUES (
[error] (SELECT x2.id ' at line 2
这是不正确的,因为我将原始SQL复制粘贴到sql浏览器中,并且运行良好。
答案 0 :(得分:0)
final case class TestTable(id: Long, name: String)
final val ctx = new SqlMirrorContext(MirrorSqlDialect, Literal)
import ctx._
final val table = quote(query[TestTable])
final val size = quote(table.filter(_.name == "hello world").size)
//the insert action
final val insert = quote {
(e: TestTable) => table.insert(e)
}
//测试
//INSERT INTO TestTable (id,name) VALUES ((SELECT COUNT(*) FROM TestTable x1 WHERE x1.name = 'hello world'), '')
ctx.run(insert(TestTable(size, "")))