MongoDB增删改查实例
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MongoDB之Java测试代码（DAO层），mongodbdao
MongoInit.java是数据库初始化及连接类
MongoUtils.java是对mongodb的各种操作方法
MongoInit.java
package com.wlwcloud.datatest; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.net.UnknownHostException; import java.util.Properties; import org.apache.log4j.Logger; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.Mongo; import com.mongodb.MongoOptions; import com.mongodb.ServerAddress; /** * Mongo工具类:设计为单例模式，每当月份发生变化，数据库连接名称就会发生变化，这是业务规则 因MongoDB的Java驱动是线程安全的，对于一般的应用，只要一个Mongo实例即可，Mongo有个内置的连接池（池大小默认为10个）。 * 对于有大量写和读的环境中，为了确保在一个Session中使用同一个DB时，我们可以用以下方式保证一致性： DB mdb =mongo.getDB(‘dbname‘); mdb.requestStart(); // 业务代码 mdb.requestDone(); * DB和DBCollection是绝对线程安全的 * @author undoner */ public class MongoInit { /** DB监听端口号 */ private static int DBPort = 27017; /** DB连接URL */ private static String DBUrl = "localhost"; /** 连接DB库名称 */ private static String DBName = "wlwdb"; static Logger log = Logger.getRootLogger(); private static Mongo mongo; private static DBCollection coll; private static DB db; static { try { DBproperties(); MongoOptions options = new MongoOptions(); options.autoConnectRetry = true; options.connectionsPerHost = 1000; options.maxWaitTime = 5000; options.socketTimeout = 0; options.connectTimeout = 15000; options.threadsAllowedToBlockForConnectionMultiplier = 5000; // 事实上，Mongo实例代表了一个数据库连接池，即使在多线程的环境中，一个Mongo实例对我们来说已经足够了 ServerAddress serverAddress = new ServerAddress(DBUrl, DBPort); mongo = new Mongo(serverAddress, options); } catch (UnknownHostException e) { log.info("get mongo instance failed"); } } static void DBproperties() { // 读取配置文件config.properties中的属性值 String myFilePath = MongoInit.class.getResource("/").getPath() + "MongoDBConfig.properties"; Properties properties = new Properties(); FileInputStream fileInputStream = null; try { fileInputStream = new FileInputStream(myFilePath); properties.load(fileInputStream); DBPort = Integer.parseInt((String) properties.getProperty("DBPort")); DBUrl = (String) properties.getProperty("DBUrl"); DBName = (String) properties.getProperty("DBName"); } catch (Exception e) { e.printStackTrace(); } finally { try { fileInputStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public static DB getDB() { if (db == null) { db = mongo.getDB(DBName); } return db; } public static Mongo getMong() { return mongo; } public static DBCollection getColl(String collname) { return getDB().getCollection(collname); } }MongoUtils.java
package com.wlwcloud.datatest; import java.net.UnknownHostException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.Set; import java.util.regex.Pattern; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.ketayao.ketacustom.entity.main.User; import com.ketayao.utils.SecurityUtils; import com.mongodb.AggregationOutput; import com.mongodb.BasicDBList; import com.mongodb.BasicDBObject; import com.mongodb.BasicDBObjectBuilder; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.DBCursor; import com.mongodb.DBObject; import com.mongodb.MapReduceCommand; import com.mongodb.MapReduceOutput; import com.mongodb.Mongo; import com.mongodb.MongoException; import com.mongodb.QueryBuilder; import com.mongodb.WriteConcern; public class MongoUtils { //DBCursor cursor = coll.find(condition).addOption(Bytes.QUERYOPTION_NOTIMEOUT);//设置游标不要超时 /** * 获取所有数据库实例 */ public void testGetDBS() { List<String> dbnames = MongoInit.getMong().getDatabaseNames(); for (String dbname : dbnames) { System.out.println("dbname:" + dbname); } } /** * 删除数据库 */ public void dropDatabase(String dbname) { MongoInit.getMong().dropDatabase(dbname); } /** * 查询所有表名 */ public void getAllCollections() { Set<String> colls = MongoInit.getDB().getCollectionNames(); for (String s : colls) { System.out.println("Collections:"+s); } } /** * 删除一个表 */ public void dropCollection(String collection) { MongoInit.getColl(collection).drop(); } /** * 添加一条记录 */ public void addData(String dbCollection,String dataID,String dataTime,String dataContent,String dataStatus) { DBCollection coll = MongoInit.getColl(dbCollection); BasicDBObject doc = new BasicDBObject(); doc.put("id", dataID); doc.put("time", dataTime); doc.put("data", dataContent); doc.put("status", dataStatus); coll.insert(doc); // 设定write concern，以便操作失败时得到提示 coll.setWriteConcern(WriteConcern.SAFE); findOne(dbCollection); } /** * 创建索引 */ public void createIndex(String collection) { MongoInit.getColl(collection).createIndex(new BasicDBObject("index_id", 1)); } /** * 获取索引信息 */ public void getIndexInfo(String dbCollection) { List<DBObject> list = MongoInit.getColl(dbCollection).getIndexInfo(); for (DBObject o : list) { System.out.println(o); } } /** * 添加多条记录 */ public void addMultiData() { for (int i = 0; i < 100; i++) { MongoInit.getColl("wujintao").insert( new BasicDBObject().append("i", i)); } List<DBObject> docs = new ArrayList<DBObject>(); for (int i = 0; i < 50; i++) { docs.add(new BasicDBObject().append("i", i)); } MongoInit.getColl("wujintao").insert(docs); // 设定write concern，以便操作失败时得到提示 MongoInit.getColl("wujintao").setWriteConcern(WriteConcern.SAFE); } /** * 查找第一条记录 */ public void findOne(String dbCollection) { DBObject myDoc = MongoInit.getColl(dbCollection).findOne(); System.out.println(myDoc); } /** * 获取表中所有记录条数 */ public void count(String dbCollection) { System.out.println(MongoInit.getColl(dbCollection).getCount()); System.out.println(MongoInit.getColl(dbCollection).count()); } /** * 获取查询结果集的记录数 */ public void getCount(String dbCollection,String dataID) { DBObject query = new BasicDBObject("id", dataID); long count = MongoInit.getColl(dbCollection).count(query); System.out.println(count); } /** * 查询所有结果 */ public void getAllDocuments(String dbCollection) { DBCursor cursor = MongoInit.getColl(dbCollection).find(); try { while (cursor.hasNext()) { System.out.println(cursor.next()); } } finally { cursor.close(); } } /** * 按照一个条件查询 */ public void queryByConditionOne() { BasicDBObject query = new BasicDBObject(); query.put("name", "MongoDB"); DBCursor cursor = MongoInit.getColl("wujintao").find(query); try { while (cursor.hasNext()) { System.out.println(cursor.next()); } } finally { cursor.close(); } } public List<SensorData> queryById(String id) { User user = SecurityUtils.getLoginUser(); BasicDBObject query = new BasicDBObject(); System.out.print(id); query.put("id", id); String table="table_"; DBCursor cursor = MongoInit.getColl("table_"+user.getUsername()).find(query); List<DBObject> list=cursor.toArray(); System.out.println(list.size()); System.out.println("dao.."+list.toString()); List<SensorData> sensordata=new ArrayList<SensorData>(); for(int i=1;i<list.size();i++) { String sid=(String)list.get(i).get("id"); String stime=(String)list.get(i).get("time"); String sdata=(String)list.get(i).get("data"); String status=(String)list.get(i).get("status"); String sstatus; if(status.equals("0"))sstatus="正常"; else if(status.equals("1")) sstatus="删除"; else sstatus="未知状态"; SensorData a=new SensorData(sid,stime,sdata,sstatus); //System.out.print(a.getData()+a.getId()+a.getStatus()+a.getTime()); sensordata.add(a); } return sensordata; /* try { while (cursor.hasNext()) { System.out.println(cursor.next()); } } finally { cursor.close(); } */ } /** * AND多条件查询,区间查询 */ public void queryMulti() { BasicDBObject query = new BasicDBObject(); // 查询j不等于3,k大于10的结果集 query.put("j", new BasicDBObject("$ne", 3)); query.put("k", new BasicDBObject("$gt", 10)); DBCursor cursor = MongoInit.getColl("wujintao").find(query); try { while (cursor.hasNext()) { System.out.println(cursor.next()); } } finally { cursor.close(); } } /** * 区间查询 * select * from table where i >50 */ public void queryMulti2() { BasicDBObject query = new BasicDBObject(); query = new BasicDBObject(); query.put("i", new BasicDBObject("$gt", 50)); // e.g. find all where i > DBCursor cursor = MongoInit.getColl("wujintao").find(query); try { while (cursor.hasNext()) { System.out.println(cursor.next()); } } finally { cursor.close(); } } /** * 区间查询 * select * from table where 20 < i <= 30 //比较符 //"$gt"： 大于 //"$gte"：大于等于 //"$lt"： 小于 //"$lte"：小于等于 //"$in"： 包含 */ public void queryMulti3() { BasicDBObject query = new BasicDBObject(); query = new BasicDBObject(); query.put("i", new BasicDBObject("$gt", 20).append("$lte", 30)); DBCursor cursor = MongoInit.getColl("wujintao").find(query); try { while (cursor.hasNext()) { System.out.println(cursor.next()); } } finally { cursor.close(); } } /** * 组合in和and select * from test_Table where (a=5 or b=6) and (c=5 or d = 6) */ public void queryMulti4() { BasicDBObject query11 = new BasicDBObject(); query11.put("a", 1); BasicDBObject query12 = new BasicDBObject(); query12.put("b", 2); List<BasicDBObject> orQueryList1 = new ArrayList<BasicDBObject>(); orQueryList1.add(query11); orQueryList1.add(query12); BasicDBObject orQuery1 = new BasicDBObject("$or", orQueryList1); BasicDBObject query21 = new BasicDBObject(); query21.put("c", 5); BasicDBObject query22 = new BasicDBObject(); query22.put("d", 6); List<BasicDBObject> orQueryList2 = new ArrayList<BasicDBObject>(); orQueryList2.add(query21); orQueryList2.add(query22); BasicDBObject orQuery2 = new BasicDBObject("$or", orQueryList2); List<BasicDBObject> orQueryCombinationList = new ArrayList<BasicDBObject>(); orQueryCombinationList.add(orQuery1); orQueryCombinationList.add(orQuery2); BasicDBObject finalQuery = new BasicDBObject("$and", orQueryCombinationList); DBCursor cursor = MongoInit.getColl("wujintao").find(finalQuery); } /** * IN查询 * if i need to query name in (a,b); just use { name : { $in : [‘a‘, ‘b‘] } } * select * from things where name=‘a‘ or name=‘b‘ * @param coll */ public void queryIn() { BasicDBList values = new BasicDBList(); values.add("a"); values.add("b"); BasicDBObject in = new BasicDBObject("$in", values); DBCursor cursor = MongoInit.getColl("wujintao").find( new BasicDBObject("name", in)); try { while (cursor.hasNext()) { System.out.println(cursor.next()); } } finally { cursor.close(); } } /** * 或查询 * select * from table where name = ‘12‘ or title = ‘p‘ * @param coll */ public void queryOr() { QueryBuilder query = new QueryBuilder(); query.or(new BasicDBObject("name", 12), new BasicDBObject("title", "p")); DBCursor cursor = MongoInit.getColl("wujintao").find(query.get()).addSpecial("$returnKey", ""); try { while (cursor.hasNext()) { System.out.println(cursor.next()); } } finally { cursor.close(); } } public void customQueryField() throws UnknownHostException{ Mongo mongo = new Mongo("localhost", 27017); DB db = mongo.getDB("zhongsou_ad"); BasicDBObjectBuilder bulder = new BasicDBObjectBuilder(); bulder.add("times",1); bulder.add("aid",1); DBCursor cusor = db.getCollection("ad_union_ad_c_1").find(new BasicDBObject(),bulder.get()); for (DBObject dbObject : cusor) { System.out.println(dbObject); } } public void mapReduce() throws UnknownHostException{ Mongo mongo = new Mongo("localhost", 27017); DB db = mongo.getDB("zhongsou_ad"); /*** * book1 = {name : "Understanding JAVA", pages : 100} * book2 = {name : "Understanding JSON", pages : 200} * db.books.save(book1) * db.books.save(book2) * book = {name : "Understanding XML", pages : 300} * db.books.save(book) * book = {name : "Understanding Web Services", pages : 400} * db.books.save(book) * book = {name : "Understanding Axis2", pages : 150} * db.books.save(book) * var map = function() { var category; if ( this.pages >= 250 ) category = ‘Big Books‘; else category = "Small Books"; emit(category, {name: this.name}); }; var reduce = function(key, values) { var sum = 0; values.forEach(function(doc) { sum += 1; }); return {books: sum}; }; var count = db.books.mapReduce(map, reduce, {out: "book_results"}); */ try { DBCollection books = db.getCollection("books"); BasicDBObject book = new BasicDBObject(); book.put("name", "Understanding JAVA"); book.put("pages", 100); books.insert(book); book = new BasicDBObject(); book.put("name", "Understanding JSON"); book.put("pages", 200); books.insert(book); book = new BasicDBObject(); book.put("name", "Understanding XML"); book.put("pages", 300); books.insert(book); book = new BasicDBObject(); book.put("name", "Understanding Web Services"); book.put("pages", 400); books.insert(book); book = new BasicDBObject(); book.put("name", "Understanding Axis2"); book.put("pages", 150); books.insert(book); String map = "function() { "+ "var category; " + "if ( this.pages >= 250 ) "+ "category = ‘Big Books‘; " + "else " + "category = ‘Small Books‘; "+ "emit(category, {name: this.name});}"; String reduce = "function(key, values) { " + "var sum = 0; " + "values.forEach(function(doc) { " + "sum += 1; "+ "}); " + "return {books: sum};} "; MapReduceCommand cmd = new MapReduceCommand(books, map, reduce, null, MapReduceCommand.OutputType.INLINE, null); MapReduceOutput out = books.mapReduce(cmd); for (DBObject o : out.results()) { System.out.println(o.toString()); } } catch (Exception e) { e.printStackTrace(); } } public void GroupByManyField() throws UnknownHostException{ //此方法没有运行成功 Mongo mongo = new Mongo("localhost", 27017); DB db = mongo.getDB("libary"); DBCollection books = db.getCollection("books"); BasicDBObject groupKeys = new BasicDBObject(); groupKeys.put("total", new BasicDBObject("$sum","pages")); BasicDBObject condition = new BasicDBObject(); condition.append("pages", new BasicDBObject().put("$gt", 0)); String reduce = "function(key, values) { " + "var sum = 0; " + "values.forEach(function(doc) { " + "sum += 1; "+ "}); " + "return {books: sum};} "; /** BasicDBList basicDBList = (BasicDBList)db.getCollection("mongodb中集合编码或者编码") .group(DBObject key, --分组字段，即group by的字段 DBObject cond, --查询中where条件 DBObject initial, --初始化各字段的值 String reduce, --每个分组都需要执行的Function String finial --终结Funciton对结果进行最终的处理 */ DBObject obj = books.group(groupKeys, condition, new BasicDBObject(), reduce); System.out.println(obj); AggregationOutput ouput = books.aggregate(new BasicDBObject("$group",groupKeys)); System.out.println(ouput.getCommandResult()); System.out.println(books.find(new BasicDBObject("$group",groupKeys))); } /** * 分页查询 */ public void pageQuery() { DBCursor cursor = MongoInit.getColl("wujintao").find().skip(0) .limit(10); while (cursor.hasNext()) { System.out.println(cursor.next()); } } /** * 模糊查询 */ public void likeQuery() { Pattern john = Pattern.compile("joh?n"); BasicDBObject query = new BasicDBObject("name", john); // finds all people with "name" matching /joh?n/i DBCursor cursor = MongoInit.getColl("wujintao").find(query); } /** * 条件删除 */ public void delete(String dbCollection,String dataID) { BasicDBObject query = new BasicDBObject(); query.put("id", dataID); // 找到并且删除，并返回删除的对象 DBObject removeObj = MongoInit.getColl(dbCollection).findAndRemove(query); System.out.println(removeObj); } /** * 更新 */ public void update() { BasicDBObject query = new BasicDBObject(); query.put("name", "liu"); DBObject stuFound = MongoInit.getColl("wujintao").findOne(query); stuFound.put("name", stuFound.get("name") + "update_1"); MongoInit.getColl("wujintao").update(query, stuFound); } public void testGpsData() { try { //13862082455:117.13172:029.77659:131.2580 Date d = new Date(); SimpleDateFormat sdf =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss SSS"); String dateNowStr = sdf.format(d); System.out.println(dateNowStr); DBCollection coll = MongoInit.getColl("table_admin"); BasicDBObject doc = new BasicDBObject(); doc.put("id", "12345678"); doc.put("time", dateNowStr); doc.put("data", "117.13172:029.77659:131.2580"); doc.put("status", "0"); coll.insert(doc); // 设定write concern，以便操作失败时得到提示 coll.setWriteConcern(WriteConcern.SAFE); BasicDBObject dsort = new BasicDBObject(); dsort.put("time", -1); BasicDBObject searchDevice = new BasicDBObject(); searchDevice.put("id", "12345678"); DBCursor cursor = coll.find(searchDevice).sort(dsort); List<DBObject> list = cursor.toArray(); //ArrayList<SensorData> listSensorData=new ArrayList<SensorData>(list.size()); ObjectMapper mapper = new ObjectMapper(); String jsonfromList = null; try { //list转json jsonfromList = mapper.writeValueAsString(list); } catch (JsonProcessingException e) { // TODO Auto-generated catch block e.printStackTrace(); } //System.out.println(jsonfromList); // for(int i=0;i<list.size();i++) // { // System.out.println((String) list.get(i).get("time")); //} //System.out.println(list.size()+","+listSensorData);//list的长度 // System.out.println(cursor.count());//计算结果的数量，类似于(mysql count()函数),不受limit的影响 // while (cursor.hasNext()) { // System.out.println(cursor.next()); // } System.out.println("The Search Query has Executed!"); } catch (MongoException e) { e.printStackTrace(); } } public static void main(String[] args) { String dbname="wlwdb"; String dbCollection="table_admin"; String dbCollection1="15257102317"; String dataID="12345678"; MongoUtils tb=new MongoUtils(); tb.testGetDBS();//查询所有数据库 tb.getAllCollections();//查询所有表 // // tb.findOne(dbCollection);//查找第一条记录 tb.testGpsData(); tb.getAllDocuments(dbCollection);//获取制定表明的所有数据 //tb.dropDatabase(dbname);//删除指定数据库 //tb.delete(dbCollection,dataID);//删除制定表明和设备ID的数据 //tb.dropCollection(dbCollection);// 删除一个表 //tb.createIndex(dbCollection1);//创建索引 //tb.getIndexInfo(dbCollection1);//获得表中所有索引 } } MongoDBConfig.properties
#端口设置 DBPort=27017 #URL DBUrl=localhost #URL DBName=wlwdb
[DAO层]java代码解释逐行解释
你用的应该是ibatis,这里是批量删除，相当于把一堆操作用一个事务来提交，提高数据库性能。
//函数功能，删除list中的所有元素在数据库中的记录。
protected void batchDelete(List<?> lst, String statement)
throws SQLException
{
getSqlMapClient().startBatch();//开始批量操作
//遍历list
for (Iterator localIterator = lst.iterator(); localIterator.hasNext(); )
{
Object obj = localIterator.next();
getSqlMapClient().delete(statement, obj);//statement表示你调用的删除方法，在xml文件中定义的。
}
getSqlMapClient().executeBatch();//结束批量操作
}
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