Ignite(二)-JAVA调用例子

我会带着你远行 2021-12-11 11:05 305阅读 0赞

### Ignite-JAVA调用例子 ###

*  例子1
 *   *  前提
     *  代码
     *   *  pom.xml
         *  Client1.java
         *  Client2.java
     *  运行
 *  例子2
 *   *  前提
     *  代码
     *   *  pom.xml
         *  FieldEntity.java
         *  Student.java
         *  MyApp.java
     *  运行MyApp.java

示例为IDEA的maven工程

# 例子1 #

## 前提 ##

利用xftp把“Ignite(一)-Centos7安装部署”的服务器ignite复制到本地目录“D:\\YDGreen”  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NuZGF5WVU_size_16_color_FFFFFF_t_70]

## 代码 ##

### pom.xml ###

<properties>
            <ignite.version>2.6.0</ignite.version>
        </properties>
    
    
        <dependencies>
            <dependency>
                <groupId>org.apache.ignite</groupId>
                <artifactId>ignite-core</artifactId>
                <version>${ignite.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.ignite</groupId>
                <artifactId>ignite-spring</artifactId>
                <version>${ignite.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.ignite</groupId>
                <artifactId>ignite-indexing</artifactId>
                <version>${ignite.version}</version>
            </dependency>
    
            <dependency>
                <groupId>org.apache.ignite</groupId>
                <artifactId>ignite-web</artifactId>
                <version>${ignite.version}</version>
            </dependency>
    
            <dependency>
                <groupId>org.apache.ignite</groupId>
                <artifactId>ignite-ssh</artifactId>
                <version>${ignite.version}</version>
            </dependency>
        </dependencies>

### Client1.java ###

package com.ydfind.ignite;
    
    import org.apache.ignite.Ignite;
    import org.apache.ignite.IgniteCache;
    import org.apache.ignite.Ignition;
    import org.apache.ignite.cache.CacheAtomicityMode;
    import org.apache.ignite.configuration.CacheConfiguration;
    
    public class Client1 {
    
        public static void main(String[] args){
            Ignite ignite = Ignition.start("D:\\YDGreen\\apache-ignite-fabric-2.6.0-bin\\examples\\config\\example-cache.xml");
            CacheConfiguration<String, String> cfg = new CacheConfiguration<String, String>();
            cfg.setName("ydfind");
            cfg.setAtomicityMode(CacheAtomicityMode.TRANSACTIONAL);
            cfg.setIndexedTypes(String.class, String.class);
            ignite.getOrCreateCache(cfg);
    
            // 存入
            IgniteCache<String, String> cache = ignite.cache("ydfind");
            cache.put("name","this is a cache!");
        }
    }

### Client2.java ###

package com.ydfind.ignite;
    
    import org.apache.ignite.Ignite;
    import org.apache.ignite.IgniteCache;
    import org.apache.ignite.Ignition;
    import org.apache.ignite.cache.CacheAtomicityMode;
    import org.apache.ignite.configuration.CacheConfiguration;
    
    public class Client2 {
        public static void main(String[] args){
            Ignition.setClientMode(true);
    
            Ignite ignite = Ignition.start("D:\\YDGreen\\apache-ignite-fabric-2.6.0-bin\\examples\\config\\example-cache.xml");
            CacheConfiguration<String, String> cfg = new CacheConfiguration<String, String>();
            cfg.setName("ydfind");
            cfg.setAtomicityMode(CacheAtomicityMode.TRANSACTIONAL);
            cfg.setIndexedTypes(String.class, String.class);
            ignite.getOrCreateCache(cfg);
    
            IgniteCache<String, String> cache = ignite.cache("ydfind");
            System.out.println("---------------------取出的值为-----------------------" + cache.get("name"));
    
        }
    }

## 运行 ##

运行Client1.java, 再运行Client2.java，可以看到Client2.java输出：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NuZGF5WVU_size_16_color_FFFFFF_t_70 1]

# 例子2 #

## 前提 ##

按照“Ignite(一)-Centos7安装部署”安装ignite；

## 代码 ##

### pom.xml ###

<dependencies>
            <dependency>
                <groupId>org.apache.ignite</groupId>
                <artifactId>ignite-core</artifactId>
                <version>2.6.0</version>
            </dependency>
            <dependency>
                <groupId>org.apache.ignite</groupId>
                <artifactId>ignite-spring</artifactId>
                <version>2.6.0</version>
            </dependency>
            <dependency>
                <groupId>org.apache.ignite</groupId>
                <artifactId>ignite-indexing</artifactId>
                <version>2.6.0</version>
            </dependency>
        </dependencies>

### FieldEntity.java ###

package com.ydfind.ignite;
    
    import lombok.Data;
    import org.apache.ignite.cache.query.annotations.QuerySqlField;
    
    @Data
    public class FieldEntity
    {
        @QuerySqlField(index = true)
        private int id;
    
        @QuerySqlField
        private String name;
    
        private int level;
    
        public FieldEntity(int id, String name)
        {
            this.id = id;
            this.name = name;
        }
    
        @Override
        public String toString() {
            return "Class [id=" + id + ", name=" + name + ", level=" + level + "]";
        }
    }

### Student.java ###

package com.ydfind.ignite;
    
    import lombok.Data;
    import org.apache.ignite.cache.query.annotations.QuerySqlField;
    
    @Data
    public class Student{
        @QuerySqlField
        private int classId;
    
        @QuerySqlField
        private String name;
    
        @QuerySqlField
        private int age;
    
        public Student(int classId, String name, int age)
        {
            this.classId = classId;
            this.name = name;
            this.age = age;
        }
    
        @Override
        public String toString() {
            return "Student [classId=" + classId + ", name=" + name + ", age="
                    + age + "]";
        }
    }

### MyApp.java ###

package com.ydfind.ignite;
    
    import org.apache.ignite.Ignite;
    import org.apache.ignite.IgniteCache;
    import org.apache.ignite.Ignition;
    import org.apache.ignite.cache.CacheMode;
    import org.apache.ignite.cache.query.QueryCursor;
    import org.apache.ignite.cache.query.SqlFieldsQuery;
    import org.apache.ignite.configuration.CacheConfiguration;
    
    import java.util.List;
    
    
    public class MyApp {
        public static void main(String[] args)
        {
            Ignite ignite = Ignition.start();
            CacheConfiguration<Integer, FieldEntity> classCfg = new CacheConfiguration<Integer, FieldEntity>();
            classCfg.setName("CLA");
            classCfg.setCacheMode(CacheMode.PARTITIONED);
            classCfg.setIndexedTypes(Integer.class, FieldEntity.class);
            IgniteCache<Integer, FieldEntity> classCache = ignite.getOrCreateCache(classCfg);
            classCache.put(1, new FieldEntity(1, "五年级一班"));
            classCache.put(2, new FieldEntity(2, "五年级二班"));
    
            CacheConfiguration<Integer, Student> stuCfg = new CacheConfiguration<Integer, Student>();
            stuCfg.setName("STU");
            stuCfg.setCacheMode(CacheMode.PARTITIONED);
            stuCfg.setIndexedTypes(Integer.class, Student.class);
            IgniteCache<Integer, Student> stuCache = ignite.getOrCreateCache(stuCfg);
            stuCache.put(1, new Student(1, "张三", 10));
            stuCache.put(2, new Student(1, "李四", 11));
            stuCache.put(3, new Student(2, "王五", 11));
            stuCache.put(4, new Student(2, "胜七", 10));
    
            SqlFieldsQuery sql = new SqlFieldsQuery(
                    "select concat(stu.classId, '----', stu.name) as stuinfo"
                            + " "
                            + "from Student as stu "
                            + "");
    
            QueryCursor<List<?>> cursor = stuCache.query(sql);
            for (List<?> row : cursor)
            {
                System.out.println("学生信息：" + row.get(0));
            }
    
            SqlFieldsQuery sql1 = new SqlFieldsQuery(
                    "select concat(cla.id, '----', cla.name) as clainfo"
                            + ", concat(stu.name, '----', stu.age) as stuinfo "
                            + "from FieldEntity as cla, STU.Student as stu "
                            + "where cla.id = stu.classId");
    
            QueryCursor<List<?>> cursor1 = classCache.query(sql1);
            for (List<?> row : cursor1)
            {
                System.out.println("班级信息：" + row.get(0) + ", 学生信息：" + row.get(1));
            }
        }
    }

## 运行MyApp.java ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NuZGF5WVU_size_16_color_FFFFFF_t_70 2]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NuZGF5WVU_size_16_color_FFFFFF_t_70 1]: /images/20211211/27df175a510a4012b9117cf925d017a0.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NuZGF5WVU_size_16_color_FFFFFF_t_70 2]: /images/20211211/460b8d9b66174327af333879af296a12.png