MongoDB Interface class functions

"interface class definition" [Java] view Plaincopy

2. /**
4. * Project Name: Spidercrawler
6. * File name: Mongodbdao.java
8. * Description: TODO (describe what the file does in a word)
10. */
12. Package Com.newsTest.dao;
16. Import java.util.ArrayList;
20. Import Com.mongodb.DB; Import Database db
22. Import com.mongodb.DBCollection; Import Collection Dbcollection
24. Import Com.mongodb.DBObject; Import Object DBObject
28. /**
30. * Class Name: Mongodbdao
32. * Package Name: Com.newsTest.dao
34. * Description: TODO (here is a word describing the role of this class)
36. */
38. Public interface Mongodbdao {
40. /**
42. * Method Name: Getdb
44. * Description: Gets the specified MongoDB database
46. * @param dbName
48. * @return
50. */
52. Public DB Getdb (String dbName);
54. /**
56. * Method Name: GetCollection
58. * Description: Gets the collection collection for the specified MongoDB database
60. * @param dbName database name
62. * @param CollectionName Database Collection
64. * @return
66. */
68. Public dbcollection GetCollection (string dbName, string collectionname);
70. /**
72. * Method Name: InSert
74. * Description: Adds the given keys and the corresponding values to the specified database
76. * @param dbName
78. * @param collectionname
80. * @param keys
82. * @param values
84. * @return
86. */
88. public boolean InSert (String dbName, String CollectionName, string[] keys, object[] values);
90. /**
92. *
94. * Method Name: Delete
96. * ZHOUYH
98. * Created time: 2014-8-30 04:09:00
100. * Description: Delete database dbname, specify values for keys and corresponding values
102. * @param dbName
104. * @param collectionname
106. * @param keys
108. * @param values
110. * @return
112. */
114. public boolean Delete (String dbName, String CollectionName, string[] keys, object[] values);
116. /**
118. * Method Name: Find
120. * Description: Find the value of the specified keys and corresponding values from the database dbname
122. * @param dbName
124. * @param collectionname
126. * @param keys
128. * @param values
130. * @param num
132. * @return
134. */
136. Public arraylist<dbobject> Find (string dbName, String CollectionName, string[] keys, object[] values, int num);
138. /**
140. * Method Name: Update
142. * ZHOUYH
144. * Created time: 2014-8-30 04:17:54
146. * Description: Update database dbname, update oldvalue with specified newvalue
148. * @param dbName
150. * @param collectionname
152. * @param oldValue
154. * @param newvalue
156. * @return
158. */
160. public boolean update (string dbName, String collectionname, DBObject oldValue, DBObject newvalue);
162. /**
164. * Method Name: Isexit
166. * Description: Determines whether the given keys and corresponding values exist in the CollectionName collection of the specified dbname
168. * @param dbName
170. * @param collectionname
172. * @param keys
174. * @param values
176. * @return
178. */
180. public boolean Isexit (String dbName, String CollectionName, String key, Object value);
184. }

"Excuse class implementation" [Java] view Plaincopy

2. /**
4. * Project Name: Spidercrawler
6. * File name: Mongodbdaoimpl.java
8. * Description: TODO (describe what the file does in a word)
10. */
12. Package Com.newsTest.dao.impl;
16. Import java.net.UnknownHostException; Import the URL of the associated exception jar package
18. Import java.util.ArrayList;
22. Import Com.newsTest.dao.MongoDBDao; Import the definition of an interface class
24. Import Com.mongodb.BasicDBObject;
26. Import Com.mongodb.DB;
28. Import com.mongodb.DBCollection;
30. Import Com.mongodb.DBCursor; Import Cursors
32. Import Com.mongodb.DBObject;
34. Import com.mongodb.MongoClient;
36. Import com.mongodb.MongoClientOptions;
38. Import com.mongodb.MongoException;
40. Import Com.mongodb.WriteResult;
44. /**
46. * Class Name: Mongodbdaoimpl
48. * Package Name: Com.newsTest.dao.impl
50. * Description: TODO (here is a word describing the role of this class)
52. */
54. public class Mongodbdaoimpl implements mongodbdao{
56. /*mongodbdao is the interface that you defined earlier, not the system comes with * /
58. /**
60. * The Mongoclient instance represents the database connection pool, is thread-safe, can be shared by multi-thread, the client only maintains one instance under the multithreading condition.
62. * MONGO is non-thread-safe and is currently recommended in the MongoDB API for mongoclient replacement MONGO
64. */
66. Private mongoclient mongoclient = null;
68. /**
70. * Private Constructors
72. */
74. Private Mongodbdaoimpl () {
76. if (mongoclient = = null) {
78. Mongoclientoptions.builder build = new Mongoclientoptions.builder ();
80. Build.connectionsperhost (50);
82. The maximum number of connection that can be established with the target database is 50
84. Build.autoconnectretry (TRUE);
86. Automatic re-connect database startup
88. Build.threadsallowedtoblockforconnectionmultiplier (50);
90. If all current connection are in use, there can be 50 threads queued for each connection
92. /*
94. * When a thread accesses a database, the maximum wait time is 2 minutes before a successful access to an available database connection
96. * This is dangerous, if more than maxwaittime have not obtained this connection, the thread will throw exception
98. * So here the Maxwaittime set should be large enough to avoid database access failures due to excessive queuing threads
100. */
102. Build.maxwaittime (1000*60*2);
104. Build.connecttimeout (1000*60*1); The timeout setting to connect to the database is set to 1 minutes
108. Mongoclientoptions myoptions = Build.build ();
110. try {
112. Database Connection Instance
114. Mongoclient = new Mongoclient ("127.0.0.1", myoptions);
116. } catch (Unknownhostexception e) {
118. TODO here write exception-handling code
120. E.printstacktrace ();
122. } catch (Mongoexception e) {
124. E.printstacktrace ();
126. }
130. }
132. }

MongoDB Interface class functions