Question

java对所有mongodb表进行增删改查表名怎么设置

Answer 1

一、MongoDB数据库参数配置

1、推荐使用mongodb.cfg.properties配置，则在构造MongoDBService对象的时候只需调用无参构造方法即可自动完成配置。

2、如果没有通过mongodb.cfg.properties，会采用程序指定的默认配置。

// 定义默认配置，1、IP地址 2、端口号 3、用户名 4、密码 5、配置文件位置名 6、数据库名    private static final String MONGODB_ADDRESS = "127.0.0.1";    private static final int MONGODB_PORT = 27017;    private static final String MONGODB_USERNAME = "root";    private static final String MONGODB_PASSWORD = "";    private static final String MONGODB_RESOURCE_FILE = "mongodb.cfg.properties";    private static final String MONGODB_DBNAME = "test";    private static final String MONGODB_COLLECTIONNAME = "test";

3、通过有参构造方法构造MongoDBService对象或通过get/set方法，指定数据库及集合，优先级最高。

//有参构造方法，指定数据库名与集合名    public MongoDBServiceImpl(String dbName, String collName) {        this.dbName = dbName;        this.collName = collName;        try {            db = getDb();        } catch (Throwable e) {            e.printStackTrace();        }    }    //无参构造方法，返回配置文件配置的数据库对象引用，如果配置文件中没有设置则返回默认数据库对象引用    public MongoDBServiceImpl() {        getDb();    }    /*     * 获取数据库对象，3种情况（优先级从高到低）：<span style="white-space: pre"> </span> *1、构造方法指定2、配置文件指定3、默认数据库<span style="white-space: pre"> </span> *（情况2、3在MongoDButil中设置）     */    public DB getDb() {        if (this.db == null) {            if (this.dbName == null) {                this.db = MongoDBUtil.getDB();            } else {                this.db = MongoDBUtil.getDBByName(this.dbName);            }        }        return this.db;    }         /*     * 获取集合对象，3种情况（优先级从高到低）：         *1、构造方法指定2、配置文件指定3、默认数据库     *（情况2、3在MongoDButil中设置）     */    public DBCollection getCollection() {        if(this.collName != null){            return db.getCollection(this.collName);        }        else {            return MongoDBUtil.getDBCollection();        }    }

二、方法简介（具体实现参看MongoDBServiceImpl接口实现类）

1、获取基本信息或对象:

(1)、获取数据库名： getDbName()
(2)、设置数据库名（指定数据库）： setDbName(String dbName)
(3)、获取集合名： getCollName()
(4)、设置集合名（指定集合）： setCollName(String collName)
(5)、获取数据库对象： getDb()

2、数据插入方式：
(1)、插入单条数据： insert(DBObject obj)
(2)、插入多条数据： insertBatch(List list)void

3、数据删除方式：
(1)、删除单条数据： delete(DBObject obj)
(2)、删除多条数据： deleteBatch(List list)

4、数量统计方式：
(1)、获取集合中数据数量： getCollectionCount()
(2)、获取符合条件的数据数量： getCount(DBObject obj)

5、查找数据：
(1)、查找所有数据： findAll()
(2)、查找符合条件的数据： find(DBObject obj)
(3)、查找符合条件的数据并排序： find(DBObject query, DBObject sort)
(4)、查找符合条件的指定数量的数据并排序：find(DBObject query, DBObject sort, int start, int limit)
(5)、由ID查找数据： getById(String id)

6、更新数据 ：update(DBObject setFields, DBObject whereFields) void

7、打印List： printListDBObj(List list)

测试代码：（@Test）

public class testMongoService {    //使用mongodb.cfg.properties中配置的数据库与集合，如未指定，使用MongoDBUtil中默认的数据库与集合    MongoDBService mongoDBService1 = new MongoDBServiceImpl();         //测试插入数据    @Test    public void testInsert(){        //数据一，包括用户名、密码，地址信息（省份、城市），爱好[…]        BasicDBList dbList1 = new BasicDBList();        dbList1.add("basketball");        dbList1.add("music");        dbList1.add("web");        DBObject dbObject1 = new BasicDBObject("username","insert1")            .append("age", 18)            .append("address", new BasicDBObject("province","广东").append("city", "广州"))            .append("favourite", dbList1);        //数据二        BasicDBList dbList2 = new BasicDBList();        dbList2.add("football");        dbList2.add("music");        DBObject dbObject2 = new BasicDBObject("username","insert2")            .append("age", 18)            .append("address", new BasicDBObject("province","陕西").append("city", "西安"))            .append("favourite", dbList2);        //数据三        BasicDBList dbList3 = new BasicDBList();        dbList3.add("Linux");        DBObject dbObject3 = new BasicDBObject("username","insert3")            .append("age", 18)            .append("address", new BasicDBObject("province","河北").append("city", "保定"))            .append("favourite", dbList3);        //数据四        BasicDBList dbList4 = new BasicDBList();        dbList4.add("swim");        dbList4.add("android");        DBObject dbObject4 = new BasicDBObject("username","insert4")            .append("age", 18)            .append("address", new BasicDBObject("province","四川").append("city", "成都"))            .append("favourite", dbList4);        //数据五        DBObject dbObject5 = new BasicDBObject("username", "insert5")            .append("age", 28)            .append("address", new BasicDBObject("city", "杭州"));        mongoDBService1.printListDBObj(mongoDBService1.findAll());        System.out.println("——————————————————insert collection——————————————————");        List<dbobject> list = new ArrayList<dbobject>();        list.add(dbObject1);        list.add(dbObject2);        list.add(dbObject3);        list.add(dbObject5);        mongoDBService1.insertBatch(list);        System.out.println("——————————————————insert one——————————————————");        mongoDBService1.insert(dbObject4);        mongoDBService1.printListDBObj(mongoDBService1.findAll());    }         //测试查询数据    @Test    public void testFind(){        DBObject dbObject = new BasicDBObject("username","insert1");        System.out.println("数量：" + mongoDBService1.getCollectionCount());        System.out.println("username=java的数据数量：" + mongoDBService1.getCount(dbObject));        System.out.println("——————————————————find all——————————————————");        mongoDBService1.printListDBObj(mongoDBService1.findAll());        System.out.println("——————————————————find obj——————————————————");        mongoDBService1.printListDBObj(mongoDBService1.find(dbObject));        System.out.println("——————————————————find sort——————————————————");        mongoDBService1.printListDBObj(mongoDBService1.find(new BasicDBObject(), new BasicDBObject("age", 1)));        System.out.println("——————————————————find sort limit——————————————————");        mongoDBService1.printListDBObj(mongoDBService1.find(new BasicDBObject(), new BasicDBObject("age", 1), 1, 2));    }     //测试数据更新    @Test    public void testUpdate(){        BasicDBObject newDocument = new BasicDBObject("$set",new BasicDBObject("age",11));                         BasicDBObject searchQuery = new BasicDBObject().append("username", "insert2");             mongoDBService1.printListDBObj(mongoDBService1.find(searchQuery));        System.out.println("——————————————————update——————————————————");        mongoDBService1.update(newDocument, searchQuery);        mongoDBService1.printListDBObj(mongoDBService1.find(searchQuery));    }         //测试数据删除    @Test    public void testDelete(){        DBObject dbObject1 = new BasicDBObject("username", "insert1");        DBObject dbObject2 = new BasicDBObject("username", "insert2");        DBObject dbObject3 = new BasicDBObject("username", "insert3");        DBObject dbObject4 = new BasicDBObject("username", "insert4");        DBObject dbObject5 = new BasicDBObject("username", "insert5");        List<dbobject> list = new ArrayList<dbobject>();        list.add(dbObject1);        list.add(dbObject2);        list.add(dbObject3);        list.add(dbObject4);        mongoDBService1.printListDBObj(mongoDBService1.findAll());        System.out.println("——————————————————delete list——————————————————");        mongoDBService1.deleteBatch(list);        System.out.println("——————————————————delete one——————————————————");        mongoDBService1.delete(dbObject5);        //System.out.println("——————————————————delete all——————————————————");        //mongoDBService1.delete(new BasicDBObject());        mongoDBService1.printListDBObj(mongoDBService1.findAll());    }}</dbobject></dbobject></dbobject></dbobject>

测试结果：

源代码：（完整项目文件下载链接：点击打开链接）

MongoDBServiceImpl.java

public class MongoDBServiceImpl implements MongoDBService {    private String dbName;    private String collName;    private DB db;         //有参构造方法，指定数据库名与集合名    public MongoDBServiceImpl(String dbName, String collName) {        this.dbName = dbName;        this.collName = collName;        try {            db = getDb();        } catch (Throwable e) {            e.printStackTrace();        }    }    //无参构造方法，返回配置文件配置的数据库对象引用，如果配置文件中没有设置则返回默认数据库对象引用    public MongoDBServiceImpl() {        getDb();    }    /*     * 获取数据库对象，3种情况（优先级从高到低）：     *1、构造方法指定2、配置文件指定3、默认数据库     *（情况2、3在MongoDButil中设置）     */    public DB getDb() {        if (this.db == null) {            if (this.dbName == null) {                this.db = MongoDBUtil.getDB();            } else {                this.db = MongoDBUtil.getDBByName(this.dbName);            }        }        return this.db;    }         /*     * 获取集合对象，3种情况（优先级从高到低）：     *1、构造方法指定2、配置文件指定3、默认数据库     *（情况2、3在MongoDButil中设置）     */    public DBCollection getCollection() {        if(this.collName != null){            return db.getCollection(this.collName);        }        else {            return MongoDBUtil.getDBCollection();        }    }     public DBObject map2Obj(Map<string, object=""> map) {        DBObject obj = new BasicDBObject();        if (map.containsKey("class") && map.get("class") instanceof Class)            map.remove("class");        obj.putAll(map);        return obj;    }    //插入数据    public void insert(DBObject obj) {        getCollection().insert(obj);    }    //插入多条数据    public void insertBatch(List<dbobject> list) {        if (list == null || list.isEmpty()) {            return;        }        List<dbobject> listDB = new ArrayList<dbobject>();        for (int i = 0; i < list.size(); i++) {            listDB.add(list.get(i));        }        getCollection().insert(listDB);    }    //删除数据    public void delete(DBObject obj) {        getCollection().remove(obj);    }    //删除多条数据    public void deleteBatch(List<dbobject> list) {        if (list == null || list.isEmpty()) {            return;        }        for (int i = 0; i < list.size(); i++) {            getCollection().remove(list.get(i));        }    }    //获取集合中的数据数量    public long getCollectionCount() {        return getCollection().getCount();    }    //查找符合条件的数据数量    public long getCount(DBObject obj) {        if (obj != null)            return getCollection().getCount(obj);        return getCollectionCount();    }    //查找符合条件的数据    public List<dbobject> find(DBObject obj) {        DBCursor cur = getCollection().find(obj);        return DBCursor2list(cur);    }         //查找符合条件的数据并排序    @Override    public List<dbobject> find(DBObject query, DBObject sort) {        DBCursor cur;        if (query != null) {            cur = getCollection().find(query);        } else {            cur = getCollection().find();        }        if (sort != null) {            cur.sort(sort);        }        return DBCursor2list(cur);    }     //查找符合条件的数据并排序，规定数据个数    @Override    public List<dbobject> find(DBObject query, DBObject sort, int start,            int limit) {        DBCursor cur;        if (query != null) {            cur = getCollection().find(query);        } else {            cur = getCollection().find();        }        if (sort != null) {            cur.sort(sort);        }        if (start == 0) {            cur.batchSize(limit);        } else {            cur.skip(start).limit(limit);        }        return DBCursor2list(cur);    }         //将DBCursor转化为list<dbobject>    private List<dbobject> DBCursor2list(DBCursor cur) {        List<dbobject> list = new ArrayList<dbobject>();        if (cur != null) {            list = cur.toArray();        }        return list;    }     //更新数据    public void update(DBObject setFields, DBObject whereFields) {        getCollection().updateMulti(whereFields, setFields);    }    //查询集合中所有数据    public List<dbobject> findAll() {        DBCursor cur = getCollection().find();        List<dbobject> list = new ArrayList<dbobject>();        if (cur != null) {            list = cur.toArray();        }        return list;    }     //由ID获取数据    public DBObject getById(String id) {        DBObject obj = new BasicDBObject();        obj.put("_id", new ObjectId(id));        DBObject result = getCollection().findOne(obj);        return result;    }     public String getDbName() {        return dbName;    }     public void setDbName(String dbName) {        this.dbName = dbName;        this.db = MongoDBUtil.getDBByName(this.dbName);    }     public String getCollName() {        return collName;    }     public void setCollName(String collName) {        this.collName = collName;    }    @Override    public void printListDBObj(List<dbobject> list) {        // TODO Auto-generated method stub        for(DBObject dbObject: list){            System.out.println(dbObject);        }    }       }</dbobject></dbobject></dbobject></dbobject></dbobject></dbobject></dbobject></dbobject></dbobject></dbobject></dbobject></dbobject></dbobject></dbobject></dbobject></string,>

MongoDBUtil.java

public class MongoDBUtil {    // 定义默认配置，1、IP地址 2、端口号 3、用户名 4、密码 5、配置文件位置名 6、数据库名    private static final String MONGODB_ADDRESS = "127.0.0.1";    private static final int MONGODB_PORT = 27017;    private static final String MONGODB_USERNAME = "root";    private static final String MONGODB_PASSWORD = "";    private static final String MONGODB_RESOURCE_FILE = "mongodb.cfg.properties";    private static final String MONGODB_DBNAME = "test";    private static final String MONGODB_COLLECTIONNAME = "test";    // 定义静态变量，1、Mongo对象（代表数据库连接）2、DB对象（代表数据库）3、集合名4、数据库相关配置映射集合5、已获取的数据库连接    private static Mongo mongo;    private static DB db;    private static DBCollection collection;    private static Map<string, string=""> cfgMap = new HashMap<string, string="">();    private static Hashtable<string, db=""> mongoDBs = new Hashtable<string, db="">();     /**     * 初始化Mongo的数据库     */    static {        init();    }     /**     * 获取配置文件中配置的DB对象     */    public static DB getDB() {        return db;    }     /**     * 获取配置文件中配置的DBCollection对象     */    public static DBCollection getDBCollection() {        return collection;    }     /**     * 根据数据库名称,得到数据库 如果不存在,则创建一个该名称的数据库,并设置用户名和密码为配置文件中的参数值     *     * @param dbName     * @return DB     */    @SuppressWarnings("deprecation")    public static DB getDBByName(String dbName) {        DB db = mongo.getDB(dbName);        if (!mongoDBs.contains(db)) {            System.out.println("add");            db.addUser(cfgMap.get("mongo.db.username"),                    cfgMap.get("mongo.db.password").toCharArray());            mongoDBs.put(dbName, db);        }        return db;    }     // ————————————————————————————————————初始化过程————————————————————————————————————    /**     * 获取配置文件mongedb.cfg.properties的文件对象     */    public static File getConfigFile() {        String path = MongoDBUtil.class.getResource("/").getPath();        String fileName = path + MONGODB_RESOURCE_FILE;        System.out.println(fileName);        File file = new File(fileName);        if (file.exists()) {            return file;        }        return null;    }     /**     * 通过mongedb.cfg.properties配置文件初始化配置映射集合，如果没有编写配置文件，则加载程序指定的默认配置     */    @SuppressWarnings("unchecked")    private static void initCfgMap() {        File file = getConfigFile();        if (file != null) {            Properties p = new Properties();            try {                p.load(new FileInputStream(file));                for (Enumeration enu = p.propertyNames(); enu.hasMoreElements();) {                    String key = (String) enu.nextElement();                    String value = (String) p.getProperty(key);                    cfgMap.put(key, value);                }            } catch (IOException e) {                System.out.println("加载Mongo配置文件失败!");                e.printStackTrace();            }        } else { // 如果没有编写配置文件，则加载默认配置            cfgMap.put("mongo.db.address", MONGODB_ADDRESS);            cfgMap.put("mongo.db.port", String.valueOf(MONGODB_PORT));            cfgMap.put("mongo.db.username", MONGODB_USERNAME);            cfgMap.put("mongo.db.password", MONGODB_PASSWORD);            cfgMap.put("mongo.db.dbname", MONGODB_DBNAME);            cfgMap.put("mongo.db.collectionname", MONGODB_COLLECTIONNAME);        }    }     /**     * 初始化Mongo的数据库（将db指向相应对象引用，将collection指向相应对象引用，通过mongoDBs记录现有数据库对象）     */    @SuppressWarnings("deprecation")    private static void init() {        initCfgMap();        try {            String address = cfgMap.get("mongo.db.address");            int port = Integer.parseInt(cfgMap.get("mongo.db.port").toString());            String dbName = cfgMap.get("mongo.db.dbname");            String username = cfgMap.get("mongo.db.username");            String password = cfgMap.get("mongo.db.password");            String collectionName = cfgMap.get("mongo.db.collectionname");            mongo = new Mongo(address, port);            if (dbName != null && !"".equals(dbName)) {                db = mongo.getDB(dbName);                if (username != null && !"".equals(username)) {                    db.addUser(username, password.toCharArray());                    if (collectionName != null && !"".equals(collectionName)) {                        collection = db.getCollection(collectionName);                    }                }                mongoDBs.put(dbName, db);            }        } catch (Exception e) {            e.printStackTrace();        }    } }