SpringBoot 集成 Nebula的操作過程
工作需求,開始了解圖數(shù)據(jù)庫,經(jīng)過工具選型,最終選擇nebula graph,并集成到springboot,java 環(huán)境下如何對 Nebula Graph 進行操作,本文整理下過程。
1、首先引入 pom 依賴
<dependency> <groupId>com.vesoft</groupId> <artifactId>client</artifactId> <version>3.0.0</version> </dependency>
為方便解析 json ,這里把 fastjson 也引進來。
<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.78</version> </dependency>
2、配置文件中配置 Nebula 的信息
nebula: address[0]: host: 192.168.40.130 port: 9669 username: root password: root reconnect: false space: javatest
3、java配置過程,文件結構如下:
1)聲明 NebulaProperties 接收上面的配置信息:
@Data public class NebulaAddress { private String host; private Integer port; }
@Data @Configuration @ConfigurationProperties(prefix = "nebula") public class NebulaProperties { private List<NebulaAddress> address; private String username; private String password; private boolean reconnect; private String space; }
2)聲明 NebulaConstant 把常用的字符串聲明在這里:
public class NebulaConstant { public static final String USE = "USE "; public static final String SEMICOLON = "; "; public static final String ERROR_CODE = "-1"; @Getter @AllArgsConstructor public enum NebulaJson{ ERRORS("errors"), CODE("code"), MESSAGE("message"), RESULTS("results"), COLUMNS("columns"), DATA("data"), ROW("row"); private String key; } }
3)聲明 NebulaConfig ,初始化 NebulaPool ,及聲明 Session 的獲取方式:
便對結果的解析,再聲明一個 NebulaResult 用來接收結果:
@Data public class NebulaResult<T> { private Integer code; private String message; private List<T> data; public boolean isSuccessed(){ return code == 0; } }
4)為了方便對結果的解析,再聲明一個 NebulaResult 用來接收結果:
@Data public class NebulaResult<T> { private Integer code; private String message; private List<T> data; public boolean isSuccessed(){ return code == 0; } }
5)每次都是使用 Session 未免太麻煩,這里封裝一個 NebulaTemplate 返回上面 對象 :
@Slf4j @Component public class NebulaTemplate { @Resource Session session; public <T> NebulaResult<T> queryObject(String stmt, Class<T> tClass) { NebulaResult<T> nebulaResult = executeObject(stmt); if (Objects.isNull(nebulaResult.getData())) { return nebulaResult; } Optional.ofNullable(nebulaResult.getData()).ifPresent(data -> nebulaResult.setData(data.stream().map(d -> JSONObject.toJavaObject(((JSONObject) d), tClass)).collect(Collectors.toList()))); return nebulaResult; } public NebulaResult executeObject(String stmt) { JSONObject jsonObject = executeJson(stmt); return JSONObject.toJavaObject(jsonObject, NebulaResult.class); } public JSONObject executeJson(String stmt) { JSONObject restJson = new JSONObject(); try { JSONObject jsonObject = JSON.parseObject(Objects.requireNonNull(session).executeJson(stmt)); JSONObject errors = jsonObject.getJSONArray(NebulaConstant.NebulaJson.ERRORS.getKey()).getJSONObject(0); restJson.put(NebulaConstant.NebulaJson.CODE.getKey(), errors.getInteger(NebulaConstant.NebulaJson.CODE.getKey())); if (errors.getInteger(NebulaConstant.NebulaJson.CODE.getKey()) != 0) { restJson.put(NebulaConstant.NebulaJson.MESSAGE.getKey(), errors.getString(NebulaConstant.NebulaJson.MESSAGE.getKey())); return restJson; } JSONObject results = jsonObject.getJSONArray(NebulaConstant.NebulaJson.RESULTS.getKey()).getJSONObject(0); JSONArray columns = results.getJSONArray(NebulaConstant.NebulaJson.COLUMNS.getKey()); if (Objects.isNull(columns)) { return restJson; } JSONArray data = results.getJSONArray(NebulaConstant.NebulaJson.DATA.getKey()); if (Objects.isNull(data)) { return restJson; } List<JSONObject> resultList = new ArrayList<>(); data.stream().map(d -> (JSONObject) d).forEach(d -> { JSONArray row = d.getJSONArray(NebulaConstant.NebulaJson.ROW.getKey()); JSONObject map = new JSONObject(); for (int i = 0; i < columns.size(); i++) { map.put(columns.getString(i), row.get(i)); } resultList.add(map); }); restJson.put(NebulaConstant.NebulaJson.DATA.getKey(), resultList); } catch (Exception e) { restJson.put(NebulaConstant.NebulaJson.CODE.getKey(), NebulaConstant.ERROR_CODE); restJson.put(NebulaConstant.NebulaJson.MESSAGE.getKey(), e.toString()); log.error("nebula execute err:", e); } return restJson; } }
4、測試
@RestController public class TestController { @Resource NebulaTemplate nebulaTemplate; @GetMapping("/addVertex") public Object addJSON() throws IOErrorException { String sql = "insert vertex team(team_name, persion_num) values \"team_2\":(\"team_2\", 43);"; NebulaResult nebulaResult = nebulaTemplate.executeObject(sql); return nebulaResult; } @GetMapping("/findVertex") public Object findJson2() throws IOErrorException { String sql = "lookup on team yield id(vertex) AS id,properties(vertex).persion_num AS persion_num,properties(vertex).team_name AS team_name;"; NebulaResult<Info> infoNebulaResult = nebulaTemplate.queryObject(sql, Info.class); return infoNebulaResult; } }
5、常用的nSQL語句
//查看所有邊 LOOKUP ON follow YIELD edge AS e; //搜索點 LOOKUP ON entity WHERE entity.name == "20元的東西" YIELD properties(vertex).name as name, properties(vertex).cntt as cntt, properties(vertex).sid as sid, properties(vertex).syspath as syspath; //由一點查看關聯(lián)的所有點 GO FROM "20元的東西" OVER follow BIDIRECT YIELD dst(edge) AS destination; //查全部點 MATCH (v) RETURN v limit 100; //以下是刪除所有的邊 LOOKUP ON follow YIELD src(edge) AS src, dst(edge) AS dst | DELETE EDGE follow $-.src -> $-.dst @0; //從一點批量刪除邊 GO FROM "20元的東西" OVER * BIDIRECT YIELD src(edge) AS src, dst(edge) AS dst | DELETE EDGE follow $-.src -> $-.dst @0; //批量刪除點 LOOKUP ON entity YIELD id(vertex) as id | DELETE VERTEX $-.id; //復合查詢 LOOKUP ON entity WHERE entity.name == "20元的東西" YIELD id(vertex) as id | GO FROM $-.id OVER follow YIELD dst(edge) AS id | GO FROM $-.id OVER follow WHERE properties($$).name == "20元的東西的子節(jié)點" YIELD properties($$) as obj;
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