Merge pull request #788 from pot-mot/feat-kt-rootQuery-exist

Add KConfigurableRootQuery exists function
babyfish-ct · Nov 17, 2024 · 4d19ae1 · 4d19ae1
2 parents 2569f74 + bea56d9
commit 4d19ae1
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/...sql-kotlin/src/main/kotlin/org/babyfish/jimmer/sql/kt/ast/query/KConfigurableRootQuery.kt b/...sql-kotlin/src/main/kotlin/org/babyfish/jimmer/sql/kt/ast/query/KConfigurableRootQuery.kt
@@ -6,6 +6,7 @@ import org.babyfish.jimmer.lang.NewChain
 import org.babyfish.jimmer.sql.ast.query.PageFactory
 import org.babyfish.jimmer.sql.kt.ast.expression.rowCount
 import java.sql.Connection
+import org.babyfish.jimmer.sql.kt.ast.expression.constant
 
 interface KConfigurableRootQuery<E: Any, R> : KTypedRootQuery<R> {
 
@@ -26,6 +27,11 @@ interface KConfigurableRootQuery<E: Any, R> : KTypedRootQuery<R> {
             .withoutSortingAndPaging()
             .execute(con)[0]
 
+    fun exists(con: Connection? = null): Boolean =
+        limit(1)
+            .reselect { select(constant(1)) }
+            .execute(con).isNotEmpty()
+
     fun <P: Any> fetchPage(
         pageIndex: Int,
         pageSize: Int,