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#1212 - ENH: Add query findSingleAttribute()

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This commit is contained in:
Rob Bygrave
2017-11-18 22:36:08 +13:00
parent d5555ed9a9
commit fcff571664
4 changed files with 132 additions and 65 deletions
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src/main/java/io/ebean/ExpressionList.java
+19 -1
View File
@@ -5,9 +5,9 @@ import io.ebean.search.MultiMatch;
import io.ebean.search.TextCommonTerms;
import io.ebean.search.TextQueryString;
import io.ebean.search.TextSimple;
import javax.annotation.Nullable;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.persistence.NonUniqueResultException;
import java.sql.Timestamp;
import java.util.Collection;
@@ -261,6 +261,24 @@ public interface ExpressionList<T> {
@Nonnull
<A> List<A> findSingleAttributeList();
/**
* Execute a query returning a single value of a single property/column.
* <p>
* <pre>{@code
*
* String name =
* Ebean.find(Customer.class)
* .select("name")
* .where().eq("id", 42)
* .findSingleAttribute();
*
* }</pre>
*/
default <A> A findSingleAttribute() {
List<A> list = findSingleAttributeList();
return !list.isEmpty() ? list.get(0) : null;
}
/**
* Execute the query returning a single bean or null (if no matching
* bean is found).
src/main/java/io/ebean/Query.java
+15
View File
@@ -813,6 +813,21 @@ public interface Query<T> {
@Nonnull
<A> List<A> findSingleAttributeList();
/**
* Execute a query returning a single value of a single property/column.
* <p>
* <pre>{@code
*
* String name =
* Ebean.find(Customer.class)
* .select("name")
* .where().eq("id", 42)
* .findSingleAttribute();
*
* }</pre>
*/
<A> A findSingleAttribute();
/**
* Execute the query returning either a single bean or null (if no matching
* bean is found).
src/main/java/io/ebeaninternal/server/querydefn/DefaultOrmQuery.java
+6
View File
@@ -1284,6 +1284,12 @@ public class DefaultOrmQuery<T> implements SpiQuery<T> {
return (List<A>) server.findSingleAttributeList(this, null);
}
@Override
public <A> A findSingleAttribute() {
List<A> list = findSingleAttributeList();
return !list.isEmpty() ? list.get(0) : null;
}
@Override
public T findOne() {
return server.findOne(this, null);
src/test/java/org/tests/query/other/TestQuerySingleAttribute.java
+92 -64
View File
@@ -75,12 +75,40 @@ public class TestQuerySingleAttribute extends BaseTestCase {
Query<Customer> query = Ebean.find(Customer.class).select("name");
List<String> names = query.findSingleAttributeList();//String.class);
List<String> names = query.findSingleAttributeList();
assertThat(sqlOf(query)).contains("select t0.name from o_customer t0");
assertThat(names).isNotNull();
}
@Test
public void findSingleAttribute() {
ResetBasicData.reset();
Query<Customer> query = Ebean.find(Customer.class)
.select("name")
.where().eq("id", 1).query();
String name = query.findSingleAttribute();
assertThat(sqlOf(query)).contains("select t0.name from o_customer t0");
assertThat(name).isNotNull();
}
@Test
public void findSingleAttribute_viaExpression() {
ResetBasicData.reset();
String name = Ebean.find(Customer.class)
.select("name")
.where().eq("id", 1)
.findSingleAttribute();
assertThat(name).isNotNull();
}
@Test
public void distinctAndWhere() {
@@ -321,89 +349,89 @@ public class TestQuerySingleAttribute extends BaseTestCase {
assertThat(sqlOf(query)).contains("select distinct t1.billing_address_id from contact t0 join o_customer t1 on t1.id = t0.customer_id order by t1.billing_address_id desc");
}
@Test
public void distinctWithOrderByPkAndQuery() {
ResetBasicData.reset();
Query<Contact> query = Ebean.find(Contact.class)
.setDistinct(true)
.fetch("customer","billingAddress")
@Test
public void distinctWithOrderByPkAndQuery() {
ResetBasicData.reset();
Query<Contact> query = Ebean.find(Contact.class)
.setDistinct(true)
.fetch("customer","billingAddress")
.where().eq("customer.billingAddress.city", "Auckland")
.orderBy().desc("customer.billingAddress.id");
List<Integer> ids = query.findSingleAttributeList();
.orderBy().desc("customer.billingAddress.id");
List<Integer> ids = query.findSingleAttributeList();
assertThat(ids).isNotEmpty();
assertThat(sqlOf(query)).contains("select distinct t1.billing_address_id from contact t0 "
+ "join o_customer t1 on t1.id = t0.customer_id " // two spaces!
+ "left join o_address t2 on t2.id = t1.billing_address_id "
+ "where t2.city = ? "
+ "order by t1.billing_address_id desc");
}
@Test
public void distinctWithCascadedFetchOrderByPkAndQuery() {
ResetBasicData.reset();
Query<Contact> query = Ebean.find(Contact.class)
.setDistinct(true)
.fetch("customer","billingAddress")
.where().eq("customer.billingAddress.city", "Auckland")
.orderBy().desc("customer.billingAddress.id");
List<Short> ids = query.findSingleAttributeList();
assertThat(ids).isNotEmpty();
assertThat(sqlOf(query)).contains("select distinct t1.billing_address_id from contact t0 "
+ "join o_customer t1 on t1.id = t0.customer_id "
+ "left join o_address t2 on t2.id = t1.billing_address_id "
+ "where t2.city = ? "
+ "order by t1.billing_address_id desc");
+ "order by t1.billing_address_id desc");
}
@Test
public void distinctWithCascadedFetchOrderByPkAndQuery3() {
ResetBasicData.reset();
Query<Contact> query = Ebean.find(Contact.class)
.setDistinct(true)
@Test
public void distinctWithCascadedFetchOrderByPkAndQuery() {
ResetBasicData.reset();
Query<Contact> query = Ebean.find(Contact.class)
.setDistinct(true)
.fetch("customer","billingAddress")
.where().eq("customer.billingAddress.city", "Auckland")
.orderBy().desc("customer.billingAddress.id");
List<Integer> ids = query.findSingleAttributeList();
.orderBy().desc("customer.billingAddress.id");
List<Short> ids = query.findSingleAttributeList();
assertThat(ids).isNotEmpty();
assertThat(sqlOf(query)).contains("select distinct t1.billing_address_id from contact t0 "
+ "join o_customer t1 on t1.id = t0.customer_id "
+ "join o_customer t1 on t1.id = t0.customer_id "
+ "left join o_address t2 on t2.id = t1.billing_address_id "
+ "where t2.city = ? "
+ "order by t1.billing_address");
+ "order by t1.billing_address_id desc");
}
@Test
public void distinctWithCascadedFetchOrderByPkAndQuery2() {
ResetBasicData.reset();
Query<Contact> query = Ebean.find(Contact.class)
.setDistinct(true)
.fetch("customer","billingAddress")
.where().eq("customer.shippingAddress.city", "Auckland") // query on shippingAddress
.orderBy().desc("customer.billingAddress.id");
List<Short> ids = query.findSingleAttributeList();
@Test
public void distinctWithCascadedFetchOrderByPkAndQuery3() {
ResetBasicData.reset();
Query<Contact> query = Ebean.find(Contact.class)
.setDistinct(true)
.fetch("customer","billingAddress")
.where().eq("customer.billingAddress.city", "Auckland")
.orderBy().desc("customer.billingAddress.id");
List<Integer> ids = query.findSingleAttributeList();
assertThat(ids).isNotEmpty();
assertThat(sqlOf(query)).contains("select distinct t1.billing_address_id from contact t0 "
+ "join o_customer t1 on t1.id = t0.customer_id "
+ "join o_customer t1 on t1.id = t0.customer_id "
+ "left join o_address t2 on t2.id = t1.billing_address_id "
+ "where t2.city = ? "
+ "order by t1.billing_address");
}
@Test
public void distinctWithCascadedFetchOrderByPkAndQuery2() {
ResetBasicData.reset();
Query<Contact> query = Ebean.find(Contact.class)
.setDistinct(true)
.fetch("customer","billingAddress")
.where().eq("customer.shippingAddress.city", "Auckland") // query on shippingAddress
.orderBy().desc("customer.billingAddress.id");
List<Short> ids = query.findSingleAttributeList();
assertThat(ids).isNotEmpty();
assertThat(sqlOf(query)).contains("select distinct t1.billing_address_id from contact t0 "
+ "join o_customer t1 on t1.id = t0.customer_id "
+ "left join o_address t2 on t2.id = t1.shipping_address_id "
+ "where t2.city = ? "
+ "order by t1.billing_address_id desc");
+ "order by t1.billing_address_id desc");
}
}