Intro to JDO Queries 2/2 article (#2871)
* ADD MyApp.java class ProductItem.java class modify: package.jdo to add a named query pom.xml to add datanucleus-jdo-query.jar * remove sys.out statements
This commit is contained in:
Shaimaa Shalaby
Zeger Hendrikse
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6d0d878ba4
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303db6c663
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@ -1,6 +1,6 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>parent-modules</artifactId>
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<groupId>com.baeldung</groupId>
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@ -105,6 +105,13 @@
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</executions>
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</plugin>
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<!-- /Neuroph -->
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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@ -326,6 +333,11 @@
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<artifactId>datanucleus-xml</artifactId>
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<version>5.0.0-release</version>
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</dependency>
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<dependency>
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<groupId>org.datanucleus</groupId>
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<artifactId>datanucleus-jdo-query</artifactId>
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<version>5.0.2</version>
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</dependency>
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<dependency>
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<groupId>net.openhft</groupId>
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<artifactId>chronicle</artifactId>
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@ -546,29 +558,29 @@
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<version>${protonpack.version}</version>
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</dependency>
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<dependency>
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<groupId>org.functionaljava</groupId>
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<artifactId>functionaljava</artifactId>
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<version>4.7</version>
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</dependency>
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<dependency>
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<groupId>org.functionaljava</groupId>
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<artifactId>functionaljava-java8</artifactId>
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<version>4.7</version>
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<groupId>org.functionaljava</groupId>
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<artifactId>functionaljava</artifactId>
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<version>4.7</version>
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</dependency>
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<dependency>
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<groupId>org.functionaljava</groupId>
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<artifactId>functionaljava-quickcheck</artifactId>
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<version>4.7</version>
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</dependency>
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<dependency>
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<groupId>org.functionaljava</groupId>
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<artifactId>functionaljava-java-core</artifactId>
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<version>4.7</version>
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<groupId>org.functionaljava</groupId>
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<artifactId>functionaljava-java8</artifactId>
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<version>4.7</version>
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</dependency>
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<dependency>
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<groupId>javax.cache</groupId>
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<artifactId>cache-api</artifactId>
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<version>${cache.version}</version>
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<groupId>org.functionaljava</groupId>
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<artifactId>functionaljava-quickcheck</artifactId>
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<version>4.7</version>
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</dependency>
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<dependency>
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<groupId>org.functionaljava</groupId>
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<artifactId>functionaljava-java-core</artifactId>
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<version>4.7</version>
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</dependency>
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<dependency>
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<groupId>javax.cache</groupId>
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<artifactId>cache-api</artifactId>
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<version>${cache.version}</version>
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</dependency>
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<dependency>
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<groupId>com.hazelcast</groupId>
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@ -581,7 +593,7 @@
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<version>1.0.1</version>
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</dependency>
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<dependency>
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<groupId>com.netopyr.wurmloch</groupId>
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<groupId>com.netopyr.wurmloch</groupId>
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<artifactId>wurmloch-crdt</artifactId>
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<version>${crdt.version}</version>
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</dependency>
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@ -0,0 +1,104 @@
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package com.baeldung.jdo.query;
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import java.util.List;
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import javax.jdo.JDOQLTypedQuery;
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import javax.jdo.PersistenceManager;
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import javax.jdo.PersistenceManagerFactory;
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import javax.jdo.Query;
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import org.datanucleus.api.jdo.JDOPersistenceManagerFactory;
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import org.datanucleus.metadata.PersistenceUnitMetaData;
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public class MyApp {
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private static PersistenceManagerFactory pmf;
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private static PersistenceManager pm;
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public static void main(String[] args) {
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defineDynamicPersistentUnit();
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createTestData();
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queryUsingJDOQL();
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queryUsingTypedJDOQL();
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queryUsingSQL();
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queryUsingJPQL();
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}
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public static void createTestData(){
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ProductItem item1 = new ProductItem("supportedItem", "price less than 10", "SoldOut",5);
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ProductItem item2 = new ProductItem("pro2", "price less than 10","InStock", 8);
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ProductItem item3 = new ProductItem("pro3", "price more than 10","SoldOut", 15);
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if( pm != null ){
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pm.makePersistent(item1);
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pm.makePersistent(item2);
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pm.makePersistent(item3);
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}
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}
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public static void defineDynamicPersistentUnit(){
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PersistenceUnitMetaData pumd = new PersistenceUnitMetaData("dynamic-unit", "RESOURCE_LOCAL", null);
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pumd.addProperty("javax.jdo.option.ConnectionURL", "jdbc:mysql://localhost:3306/jdo_db");
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pumd.addProperty("javax.jdo.option.ConnectionUserName", "root");
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pumd.addProperty("javax.jdo.option.ConnectionPassword", "admin");
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pumd.addProperty("javax.jdo.option.ConnectionDriverName", "com.mysql.jdbc.Driver");
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pumd.addProperty("datanucleus.schema.autoCreateAll", "true");
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pmf = new JDOPersistenceManagerFactory(pumd, null);
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pm = pmf.getPersistenceManager();
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}
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public static void queryUsingJDOQL(){
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Query query = pm.newQuery("SELECT FROM com.baeldung.jdo.query.ProductItem "
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+ "WHERE price < threshold PARAMETERS double threshold");
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List<ProductItem> explicitParamResults = (List<ProductItem>)query.execute(10);
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query = pm.newQuery("SELECT FROM "
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+ "com.baeldung.jdo.query.ProductItem WHERE price < :threshold");
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query.setParameters("double threshold");
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List<ProductItem> explicitParamResults2 = (List<ProductItem>)query.execute(10);
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query = pm.newQuery("SELECT FROM "
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+ "com.baeldung.jdo.query.ProductItem WHERE price < :threshold");
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List<ProductItem> implicitParamResults = (List<ProductItem>)query.execute(10);
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}
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public static void queryUsingTypedJDOQL(){
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JDOQLTypedQuery<ProductItem> tq = pm.newJDOQLTypedQuery(ProductItem.class);
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QProductItem cand = QProductItem.candidate();
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tq=tq.filter(cand.price.lt(10).and(cand.name.startsWith("pro")));
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List<ProductItem> results = tq.executeList();
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}
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public static void queryUsingSQL(){
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Query query = pm.newQuery("javax.jdo.query.SQL","select * from "
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+ "product_item where price < ? and status = ?");
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query.setClass(ProductItem.class);
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query.setParameters(10,"InStock");
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List<ProductItem> results = query.executeList();
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}
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public static void queryUsingJPQL(){
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Query query = pm.newQuery("JPQL","select i from "
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+ "com.baeldung.jdo.query.ProductItem i where i.price < 10"
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+ " and i.status = 'InStock'");
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List<ProductItem> results = (List<ProductItem>) query.execute();
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}
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public static void namedQuery(){
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Query<ProductItem> query = pm.newNamedQuery(
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ProductItem.class, "PriceBelow10");
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List<ProductItem> results = query.executeList();
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}
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}
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@ -0,0 +1,68 @@
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package com.baeldung.jdo.query;
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import javax.jdo.annotations.IdGeneratorStrategy;
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import javax.jdo.annotations.PersistenceAware;
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import javax.jdo.annotations.PersistenceCapable;
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import javax.jdo.annotations.Persistent;
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import javax.jdo.annotations.PrimaryKey;
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@PersistenceCapable(table = "product_item")
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public class ProductItem {
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@PrimaryKey
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@Persistent(valueStrategy=IdGeneratorStrategy.INCREMENT)
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int id;
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String name;
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String description;
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String status;
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double price;
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public ProductItem(){
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}
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public ProductItem(String name,String description,String status,double price){
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this.name=name;
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this.description = description;
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this.status = status;
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this.price = price;
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}
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getDescription() {
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return description;
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}
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public void setDescription(String description) {
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this.description = description;
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}
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public double getPrice() {
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return price;
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}
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public void setPrice(double price) {
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this.price = price;
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}
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public String getStatus() {
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return status;
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}
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public void setStatus(String status) {
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this.status = status;
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}
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}
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@ -16,6 +16,14 @@
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</field>
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</class>
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</package>
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<package name="com.baeldung.jdo.query">
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<class name="ProductItem" detachable="true" table="product_item">
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<query name="PriceBelow10" language="javax.jdo.query.SQL">
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<![CDATA[SELECT * FROM PRODUCT_ITEM WHERE PRICE < 10
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]]></query>
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</class>
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</package>
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</jdo>
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