jpa cast error

2018-11-09 20:54:10 +01:00
parent a8ee73cfc9
commit 61ffac2c77
5 changed files with 193 additions and 0 deletions
@@ -0,0 +1,44 @@
+package com.baeldung.jpa.stringcast;
+
+import javax.persistence.*;
+
+@SqlResultSetMapping(name = "textQueryMapping", classes = {
+  @ConstructorResult(targetClass = DummyEntity.class, columns = {
+    @ColumnResult(name = "text")
+  })
+})
+@Entity
+@Table(name = "dummy")
+public class DummyEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private String text;
+
+    public DummyEntity() {
+
+    }
+
+    public DummyEntity(String text) {
+        this.text = text;
+    }
+
+    public String getText() {
+        return text;
+    }
+
+    public void setText(String text) {
+        this.text = text;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+}
@@ -0,0 +1,41 @@
+package com.baeldung.jpa.stringcast;
+
+import com.sun.istack.internal.Nullable;
+
+import javax.persistence.EntityManager;
+import javax.persistence.Query;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class QueryExecutor {
+
+    public static List<String[]> executeNativeQueryNoCastCheck(String statement, EntityManager em) {
+        Query query = em.createNativeQuery(statement);
+        return query.getResultList();
+    }
+
+    public static List<String[]> executeNativeQueryWithCastCheck(String statement, EntityManager em) {
+        Query query = em.createNativeQuery(statement);
+        List results = query.getResultList();
+
+        if (results.isEmpty()) {
+            return new ArrayList<>();
+        }
+
+        if (results.get(0) instanceof String) {
+            return ((List<String>) results)
+              .stream()
+              .map(s -> new String[] { s })
+              .collect(Collectors.toList());
+        } else {
+            return (List<String[]>) results;
+        }
+    }
+
+    public static <T> List<T> executeNativeQueryGeneric(String statement, String mapping, EntityManager em) {
+        Query query = em.createNativeQuery(statement, mapping);
+        return query.getResultList();
+    }
+
+}
@@ -20,6 +20,21 @@
            <property name="hibernate.temp.use_jdbc_metadata_defaults" value="false"/>
        </properties>
    </persistence-unit>
+
+    <persistence-unit name="jpa-h2">
+        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
+        <class>com.baeldung.jpa.stringcast.DummyEntity</class>
+        <properties>
+            <property name="javax.persistence.jdbc.driver" value="org.h2.Driver" />
+            <property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:test" />
+            <property name="javax.persistence.jdbc.user" value="sa" />
+            <property name="javax.persistence.jdbc.password" value="" />
+            <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect" />
+            <property name="hibernate.hbm2ddl.auto" value="create-drop" />
+            <property name="show_sql" value="true"/>
+            <property name="hibernate.temp.use_jdbc_metadata_defaults" value="false"/>
+        </properties>
+    </persistence-unit>
    
    <persistence-unit name="jpa-db">
        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>