trunk/tools/ClusterConnection.java

package tools;
import java.sql.*;
import java.util.ArrayList;
import java.util.HashMap;

/**
 * ClusterConnection class to wrap the master/node mysql servers so that is transparent to other programs
 * @author Jose Duarte
 */

public class ClusterConnection {

        private String MASTERDB="key_master"; 
        private final String MASTERHOST="white";
        private MySQLConnection nCon;
        private MySQLConnection mCon;
        public String keyTable;
        public String key;
        public String host;
        public String db;
        private String user;
        private String password;

        /**
         * Create a ClusterConnection passing a key. 
         * @param db the database name
         * @param key the key name: e.g. asu_id
         * @param user the user name for connection to both master and nodes
         * @param password the password for connection to both master and nodes
         */
        public ClusterConnection (String db,String key, String user,String password) {
                setDb(db);
                setUser(user);
                setPassword(password);
                // For nCon we create a connection to the master too. 
                // This is just a place holder because the actual node connection is not created until we create the statement
                // If we don't do this then when closing the two connections an exception might occurr because we try to close a non existing object
                this.nCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB); 
                this.mCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
                this.key=key; //can't use the setKey method here before we've got the db field initialized
                setKeyTable(db);
        }

        /**
         * Create a ClusterConnection without passing a key. The key will be set later when we call createStatement(key,idx) 
         * @param db the database name
         * @param user the user name for connection to both master and nodes
         * @param password the password for connection to both master and nodes
         */ 
        public ClusterConnection (String db, String user,String password) { 
                setDb(db);
                setUser(user);
                setPassword(password);          
                // For nCon we create a connection to the master too. 
                // This is just a place holder because the actual node connection is not created until we create the statement
                // If we don't do this then when closing the two connections an exception might occurr because we try to close a non existing object
                this.nCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB); 
                this.mCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
        }
        
        public void close() {
                this.nCon.close();
                this.mCon.close();
        }
        
        public String getHost4Idx (int idx) {
                String host="";
                String query = "SELECT client_name FROM "+keyTable+" AS m INNER JOIN clients_names AS c "+
                                           "ON (m.client_id=c.client_id) WHERE "+key+"="+idx+";";
                host=this.mCon.getStringFromDb(query);
                return host;
        }
        
        public void setHostFromIdx(int idx){
                setHost(getHost4Idx(idx));
        }
        
        public void setHost(String host) {
                this.host=host;
                //Closing previous connection is essential
                //If we don't close it a lot of connections stay open after using a ClusterConnection object for a while
                this.nCon.close(); 
                this.nCon = new MySQLConnection(host,user,password,db);
        }
        
        /**
         * This method is strictly private. We shouldn't call this from another class as a key might not be set when we call it
         * and thus we can't get the client_id from the master key table. Only to be called from createStatement(key,idx)
         * @param idx the value of the id for a certain key already set
         * @return a Stament object with a connection to the node that contains idx for key
         */
        private Statement createStatement(int idx) { // to use when the field "key" is already set
                setKeyTable();
                Statement S=null;
                this.setHostFromIdx(idx);
                try {
                        S=this.nCon.createStatement();
                }
                catch (SQLException e){
                        System.err.println("SQLException: " + e.getMessage());
                        System.err.println("SQLState:     " + e.getSQLState());
                        System.err.println("Couldn't create statement for the node connection, idx= "+idx+", exiting.");
                        System.exit(2);                                                                 
                }
                return S;
        }
        
        /**
         * This method is used to create a statement passing the key and idx. It will create a connection the the right node 
         * and return a Statement for that connection
         * @param idx the key name
         * @param idx the id value for that key
         * @return a Statement object with a connection to the node that contains idx for key
         */
        public Statement createStatement(String key,int idx) {
                setKey(key);
                return createStatement(idx);
        }
        
        /**
         * To execute a sql update/insert query in the right node given a query, key and idx. Just a shortcut not to have to do the create statement and execute
         * @param query the SQL query
         * @param key the name of the key
         * @param idx the id value for that key
         */
        public void executeSql(String query,String key, int idx) throws SQLException {
                Statement stmt;
                stmt = this.createStatement(key,idx);   
                stmt.execute(query);
                stmt.close();               
        }
        
        /**
         * To change the MASTERDB String, i.e. the name of the key master database. To be used in testing.
         * @param db the name of the key master db we want to use instead of the default defined in the MASTERDB field
         */
        public void setKeyDb(String db) { 
                this.MASTERDB=db;
                //Closing previous connection is essential
                this.mCon.close(); 
                this.mCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
        }
        
        /**
         * To set keyTable field in constructor (i.e. first time). Only to be used in constructor.
         * @param db the database name
         */
        public void setKeyTable(String db) { 
                String query="SELECT key_master_table FROM dbs_keys WHERE db=\'"+db+"\' AND key_name=\'"+this.key+"\';";
                this.keyTable=this.mCon.getStringFromDb(query);
        }
        
        /**
         * To set the keyTable field when db is already set
         * The value of keyTable is taken from the dbs_keys table in the database given the db and key.
         */
        public void setKeyTable() {  
                String query="SELECT key_master_table FROM dbs_keys WHERE db=\'"+this.db+"\' AND key_name=\'"+this.key+"\';";
                this.keyTable=this.mCon.getStringFromDb(query);
        }
        
        public String getKeyTable() {
                return this.keyTable;
        }
        
        /**
         * To get the name of the target table where splitted data is stored in nodes, e.g. for keyTable pdbgraph__asu_list, we get asu_list
         * @return
         */
        public String getTableOnNode(){
                String table="";
                if (this.keyTable.contains("__")) {
                        String[] tokens=this.keyTable.split("__");
                        table=tokens[1];
                }
                else {
                        System.err.println("Error! The keyTable field is not set in this ClusterConnection object.");
                }
                return table;
        }
        
        public void setUser(String user) {
                this.user=user;
        }

        public void setPassword(String password) {
                this.password=password;
        }
        
        public void setDb(String db){
                this.db=db;
        }
        
        public void setKey(String key){
                this.key=key;
                setKeyTable();
        }

        public Statement createMasterStatement() { 
                Statement S=null;
                try {
                        S=this.mCon.createStatement();
                }
                catch (SQLException e){
                        System.err.println("SQLException: " + e.getMessage());
                        System.err.println("SQLState:     " + e.getSQLState());
                        System.err.println("Couldn't create statement for the master connection, exiting.");
                        System.exit(2);                                                                 
                }
                return S;
        }
        
        public int[] getAllIdxFromMaster(String key) { 
                this.setKey(key);
                int[] ids=null;
                ArrayList<Integer> idsAL=new ArrayList<Integer>();
                try {                   
                        String query="SELECT "+key+" FROM "+keyTable+";";
                        Statement S=this.mCon.createStatement();
                        ResultSet R=S.executeQuery(query);
                        while (R.next()){
                                idsAL.add(R.getInt(1));
                        }
                        R.close();
                        S.close();
                }
                catch (SQLException e){
                        System.err.println("SQLException: " + e.getMessage());
                        System.err.println("SQLState:     " + e.getSQLState());
                        System.err.println("Couldn't get all indices from columnn "+key+" in table "+keyTable+" from "+MASTERDB+" database in "+MASTERHOST+", exiting.");
                        System.exit(2);                                                                 
                }
                ids=new int[idsAL.size()];
                for (int i=0;i<idsAL.size();i++){
                        ids[i]=idsAL.get(i);
                }
                return ids;
        }
        /**
         * To get all ids and clients_names pairs for a certain key. Useful when need to submit to all hosts using qsub -q
         * @param key the name of the key
         * @return HashMap with keys = indices, and values = node names where the corresponding index is stored
         */
        public HashMap<Integer,String> getAllIdxAndClients (String key){
                this.setKey(key);
                HashMap<Integer,String> idsAndClients=new HashMap<Integer,String>();
                try {
                        String query="SELECT a."+key+",c.client_name FROM "+keyTable+" AS a INNER JOIN clients_names AS c ON (a.client_id=c.client_id);";
                        Statement S=this.mCon.createStatement();
                        ResultSet R=S.executeQuery(query);
                        while (R.next()){
                                idsAndClients.put(R.getInt(1),R.getString(2));
                        }
                        R.close();
                        S.close();
                }
                catch (SQLException e){
                        System.err.println("SQLException: " + e.getMessage());
                        System.err.println("SQLState:     " + e.getSQLState());
                        System.err.println("Couldn't get all indices/client_names pairs from table "+keyTable+" from "+MASTERDB+" database in "+MASTERHOST+", exiting.");
                        System.exit(2);                                                                 
                }
                return idsAndClients;
        }
        
        /**
         * To get client_id for a certain idx and key
         * @param key the key name
         * @param idx the id value for that key
         * @return the client_id for node that has the data for the idx for that key
         */
        //TODO will need to change the query. In general this method would return more than 1 client_id if the idx is not unique
        public int getHostId4Idx (String key,int idx) { 
                int hostId=0;
                this.setKey(key);
                String query;
                int countCids=0;
                query="SELECT count(client_id) FROM "+keyTable+" WHERE "+key+"="+idx+";";
                countCids=this.mCon.getIntFromDb(query);
                if (countCids!=1){
                        System.err.println("the query was: "+query);
                        System.err.println("Error! the count of client_ids for idx "+key+"= "+idx+" is " +countCids+
                                        ". It must be 1! The values were taken from host: "+MASTERHOST+", database: "+MASTERDB+", table: "+keyTable+". Check what's wrong! Exiting now.");
                        System.exit(2);
                }
                else {
                        query="SELECT client_id FROM "+keyTable+" WHERE "+key+"="+idx+";";
                        hostId=this.mCon.getIntFromDb(query);
                }
                return hostId;
        }
        
        public void insertIdxInMaster(String key, int clientId) {
                String query;
                this.setKey(key);
                try {
                        query="INSERT INTO "+this.keyTable+" (client_id) VALUES ("+clientId+");";
                        this.mCon.executeSql(query);
                } 
                catch (SQLException E) {
                        System.err.println("SQLException: " + E.getMessage());
                        System.err.println("SQLState:     " + E.getSQLState());
                        System.err.println("Couldn't insert new "+this.key+" in master table "+this.getKeyTable()+". The client_id for it was "+clientId+". Exiting.");
                        System.exit(2);
                } 
        }

        public void insertIdxInMaster(String keySrc,String keyDest,int idxSrc) {
                this.setKey(keySrc);
                int clientId=0;
                clientId=this.getHostId4Idx(keySrc,idxSrc);
                insertIdxInMaster(keyDest,clientId);
        }

        public int getLastInsertId(String key) {
                int lastIdx=0;
                this.setKey(key);
                String query = "";
                query = "SELECT LAST_INSERT_ID() FROM "+this.keyTable+" LIMIT 1;";
                lastIdx=this.mCon.getIntFromDb(query);
                return lastIdx;
        }
        
        public int[][] getIdxSet(String key) { 
                int[][] indMatrix=null;
                this.setKey(key);
                String query;
                Statement S;
                ResultSet R;
                try {
                        // STEP 1 -- getting set of all client_ids                      
                        query="SELECT count(distinct client_id) FROM "+keyTable+";";
                        int count=0;
                        count=this.mCon.getIntFromDb(query);
                        S=this.mCon.createStatement();
                        query="SELECT DISTINCT client_id FROM "+keyTable+" ORDER BY client_id;";
                        R=S.executeQuery(query);
                        
                        // STEP 2 -- putting sets of indices counts into temp tables c_<client_id> with a serial auto_increment field
                        int[] clids=new int[count]; //array to store all client_ids. To be used in loops later
                        int i=0;
                        while (R.next()){
                                Statement Sloop=this.mCon.createStatement();
                                int clid=R.getInt(1);
                                query="CREATE TEMPORARY TABLE c_"+clid+" (serial int(11) NOT NULL AUTO_INCREMENT,"+key+" int(11),client_id int(11), PRIMARY KEY(serial));";                             
                                Sloop.executeUpdate(query);
                                query="INSERT INTO c_"+clid+" ("+key+",client_id) SELECT "+key+",client_id FROM "+keyTable+" WHERE client_id="+clid+";";
                                Sloop.executeUpdate(query);
                                clids[i]=clid;
                                i++;
                                Sloop.close();
                        }
                        
                        // STEP3 -- merging all c_<client_id> tables into a temp table tmp_allcs and selecting the client_id with the maximum count
                        //query="SELECT client_id,count(*) as c FROM c_34 GROUP BY client_id UNION SELECT client_id,count(*) as c FROM c_32 GROUP BY client_id;";
                        query="DROP TABLE IF EXISTS tmp_allcs;"; 
                        S.executeUpdate(query);
                        //this table must be permanent! otherwise cannot do the select max(c) later
                        query="CREATE TABLE IF NOT EXISTS tmp_allcs (client_id int(11), c int(11)) ENGINE=MEMORY;";
                        S.executeUpdate(query);
                        String unionStr="SELECT client_id,count(*) AS c FROM c_"+clids[0]+" GROUP BY client_id";
                        for (i=1;i<clids.length;i++) {
                                unionStr+=" UNION SELECT client_id,count(*) AS c FROM c_"+clids[i]+" GROUP BY client_id";
                        }
                        query="INSERT INTO tmp_allcs "+unionStr+";";
                        S.executeUpdate(query);
                        query="SELECT client_id,c FROM tmp_allcs WHERE c=(SELECT max(c) FROM tmp_allcs);";
                        R=S.executeQuery(query);
                        int clidMaxIdxCount=0;
                        int maxIdxCount=0;
                        if (R.next()) {
                                clidMaxIdxCount=R.getInt(1);
                                maxIdxCount=R.getInt(2);
                        }
                        query="DROP TABLE tmp_allcs;";
                        S.executeUpdate(query);
                        
                        // STEP 4 -- join all c_<client_id> tables into a table with a serial column, and c_<client_id> columns each of them with the indices for each client_id 
                        //query="SELECT c_34.serial,c_34.asu_id AS c_34,c_32.asu_id AS c_32,c_36.asu_id AS c_36 FROM c_34 LEFT JOIN c_32 ON (c_34.serial=c_32.serial) LEFT JOIN c_36 ON (c_34.serial=c_36.serial);";
                        String selectStr="c_"+clidMaxIdxCount+".serial, c_"+clidMaxIdxCount+"."+key+" AS c_"+clidMaxIdxCount;
                        String fromStr="c_"+clidMaxIdxCount;
                        for (i=0;i<clids.length;i++) {
                                if (clids[i]!=clidMaxIdxCount){
                                        selectStr+=", c_"+clids[i]+"."+key+" AS c_"+clids[i];
                                        fromStr+=" LEFT JOIN c_"+clids[i]+" ON (c_"+clidMaxIdxCount+".serial=c_"+clids[i]+".serial)";
                                }
                        } 
                        query="CREATE TEMPORARY TABLE indices_matrix "+"SELECT "+selectStr+" FROM "+fromStr+";";
                        S.executeUpdate(query);
                        
                        // STEP 5 -- put the table into a 2-dimensional array and return it
                        indMatrix = new int[maxIdxCount][clids.length];
                        query="SELECT * FROM indices_matrix";
                        R=S.executeQuery(query);
                        i=0;
                        while (R.next()) {
                                for (int j=0;j<clids.length;j++){
                                        indMatrix[i][j]=R.getInt(j+2);
                                }
                                i++;
                        }
                        R.close();
                        S.close();
                }
                catch (SQLException e){
                        System.err.println("SQLException: " + e.getMessage());
                        System.err.println("SQLState:     " + e.getSQLState());
                        System.err.println("Couldn't get the indices set from columnn "+key+" in table "+keyTable+" from "+MASTERDB+" database in "+MASTERHOST+", exiting.");
                        System.exit(2);                                                                 
                }
                return indMatrix;
        }

        
}
Revision:	81
Committed:	Wed Apr 12 15:27:05 2006 UTC (18 years, 5 months ago) by duarte
File size:	14963 byte(s)
Log Message:	Changed the Connection fields to be MySQLConnection. Thanks to this, simplify considerably a lot of the methods by using the MySQLConnection methods. Got rid of method loadSQLDriver and URL final field
Line	User	Rev	File contents
1	duarte	16	package tools;
2	duarte	15	import java.sql.*;
3	duarte	67	import java.util.ArrayList;
4			import java.util.HashMap;
5	duarte	15
6			/**
7			* ClusterConnection class to wrap the master/node mysql servers so that is transparent to other programs
8			* @author Jose Duarte
9			*/
10
11			public class ClusterConnection {
12
13	duarte	34	private String MASTERDB="key_master";
14			private final String MASTERHOST="white";
15	duarte	81	private MySQLConnection nCon;
16			private MySQLConnection mCon;
17	duarte	15	public String keyTable;
18			public String key;
19			public String host;
20			public String db;
21			private String user;
22			private String password;
23	duarte	34
24			/**
25			* Create a ClusterConnection passing a key.
26	duarte	35	* @param db the database name
27	duarte	72	* @param key the key name: e.g. asu_id
28	duarte	35	* @param user the user name for connection to both master and nodes
29			* @param password the password for connection to both master and nodes
30	duarte	34	*/
31	duarte	15	public ClusterConnection (String db,String key, String user,String password) {
32	duarte	72	setDb(db);
33			setUser(user);
34			setPassword(password);
35	duarte	81	// For nCon we create a connection to the master too.
36			// This is just a place holder because the actual node connection is not created until we create the statement
37			// If we don't do this then when closing the two connections an exception might occurr because we try to close a non existing object
38			this.nCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
39			this.mCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
40	duarte	17	this.key=key; //can't use the setKey method here before we've got the db field initialized
41	duarte	34	setKeyTable(db);
42	duarte	15	}
43
44	duarte	34	/**
45			* Create a ClusterConnection without passing a key. The key will be set later when we call createStatement(key,idx)
46	duarte	35	* @param db the database name
47			* @param user the user name for connection to both master and nodes
48			* @param password the password for connection to both master and nodes
49	duarte	34	*/
50	duarte	15	public ClusterConnection (String db, String user,String password) {
51			setDb(db);
52			setUser(user);
53	duarte	81	setPassword(password);
54			// For nCon we create a connection to the master too.
55			// This is just a place holder because the actual node connection is not created until we create the statement
56			// If we don't do this then when closing the two connections an exception might occurr because we try to close a non existing object
57			this.nCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
58			this.mCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
59	duarte	15	}
60
61			public void close() {
62	duarte	81	this.nCon.close();
63			this.mCon.close();
64	duarte	15	}
65
66			public String getHost4Idx (int idx) {
67			String host="";
68	duarte	81	String query = "SELECT client_name FROM "+keyTable+" AS m INNER JOIN clients_names AS c "+
69			"ON (m.client_id=c.client_id) WHERE "+key+"="+idx+";";
70			host=this.mCon.getStringFromDb(query);
71	duarte	15	return host;
72			}
73
74			public void setHostFromIdx(int idx){
75			setHost(getHost4Idx(idx));
76			}
77
78			public void setHost(String host) {
79			this.host=host;
80	duarte	81	//Closing previous connection is essential
81			//If we don't close it a lot of connections stay open after using a ClusterConnection object for a while
82			this.nCon.close();
83			this.nCon = new MySQLConnection(host,user,password,db);
84	duarte	15	}
85	duarte	35
86	duarte	34	/**
87			* This method is strictly private. We shouldn't call this from another class as a key might not be set when we call it
88			* and thus we can't get the client_id from the master key table. Only to be called from createStatement(key,idx)
89	duarte	35	* @param idx the value of the id for a certain key already set
90			* @return a Stament object with a connection to the node that contains idx for key
91	duarte	34	*/
92			private Statement createStatement(int idx) { // to use when the field "key" is already set
93			setKeyTable();
94	duarte	15	Statement S=null;
95			this.setHostFromIdx(idx);
96			try {
97			S=this.nCon.createStatement();
98			}
99			catch (SQLException e){
100	duarte	33	System.err.println("SQLException: " + e.getMessage());
101			System.err.println("SQLState: " + e.getSQLState());
102			System.err.println("Couldn't create statement for the node connection, idx= "+idx+", exiting.");
103	duarte	15	System.exit(2);
104			}
105			return S;
106			}
107	duarte	35
108	duarte	34	/**
109	duarte	35	* This method is used to create a statement passing the key and idx. It will create a connection the the right node
110			* and return a Statement for that connection
111			* @param idx the key name
112			* @param idx the id value for that key
113			* @return a Statement object with a connection to the node that contains idx for key
114	duarte	34	*/
115	duarte	15	public Statement createStatement(String key,int idx) {
116			setKey(key);
117			return createStatement(idx);
118			}
119
120	duarte	35	/**
121	duarte	43	* To execute a sql update/insert query in the right node given a query, key and idx. Just a shortcut not to have to do the create statement and execute
122			* @param query the SQL query
123			* @param key the name of the key
124			* @param idx the id value for that key
125			*/
126	duarte	81	public void executeSql(String query,String key, int idx) throws SQLException {
127	duarte	43	Statement stmt;
128	duarte	81	stmt = this.createStatement(key,idx);
129			stmt.execute(query);
130			stmt.close();
131	duarte	43	}
132	duarte	81
133	duarte	51	/**
134			* To change the MASTERDB String, i.e. the name of the key master database. To be used in testing.
135			* @param db the name of the key master db we want to use instead of the default defined in the MASTERDB field
136			*/
137			public void setKeyDb(String db) {
138			this.MASTERDB=db;
139	duarte	81	//Closing previous connection is essential
140			this.mCon.close();
141			this.mCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
142	duarte	51	}
143	duarte	43
144			/**
145	duarte	72	* To set keyTable field in constructor (i.e. first time). Only to be used in constructor.
146	duarte	35	* @param db the database name
147			*/
148			public void setKeyTable(String db) {
149	duarte	72	String query="SELECT key_master_table FROM dbs_keys WHERE db=\'"+db+"\' AND key_name=\'"+this.key+"\';";
150	duarte	81	this.keyTable=this.mCon.getStringFromDb(query);
151	duarte	15	}
152
153	duarte	35	/**
154	duarte	43	* To set the keyTable field when db is already set
155	duarte	72	* The value of keyTable is taken from the dbs_keys table in the database given the db and key.
156	duarte	35	*/
157			public void setKeyTable() {
158	duarte	72	String query="SELECT key_master_table FROM dbs_keys WHERE db=\'"+this.db+"\' AND key_name=\'"+this.key+"\';";
159	duarte	81	this.keyTable=this.mCon.getStringFromDb(query);
160	duarte	15	}
161
162	duarte	34	public String getKeyTable() {
163	duarte	15	return this.keyTable;
164			}
165
166	duarte	72	/**
167			* To get the name of the target table where splitted data is stored in nodes, e.g. for keyTable pdbgraph__asu_list, we get asu_list
168			* @return
169			*/
170			public String getTableOnNode(){
171			String table="";
172			if (this.keyTable.contains("__")) {
173			String[] tokens=this.keyTable.split("__");
174			table=tokens[1];
175			}
176			else {
177			System.err.println("Error! The keyTable field is not set in this ClusterConnection object.");
178			}
179			return table;
180	duarte	15	}
181	duarte	72
182	duarte	15	public void setUser(String user) {
183			this.user=user;
184			}
185
186			public void setPassword(String password) {
187			this.password=password;
188			}
189
190			public void setDb(String db){
191			this.db=db;
192			}
193
194			public void setKey(String key){
195			this.key=key;
196	duarte	34	setKeyTable();
197	duarte	15	}
198
199			public Statement createMasterStatement() {
200			Statement S=null;
201			try {
202			S=this.mCon.createStatement();
203			}
204			catch (SQLException e){
205	duarte	33	System.err.println("SQLException: " + e.getMessage());
206			System.err.println("SQLState: " + e.getSQLState());
207			System.err.println("Couldn't create statement for the master connection, exiting.");
208	duarte	15	System.exit(2);
209			}
210			return S;
211			}
212	duarte	74
213	duarte	67	public int[] getAllIdxFromMaster(String key) {
214	duarte	15	this.setKey(key);
215	duarte	67	int[] ids=null;
216			ArrayList<Integer> idsAL=new ArrayList<Integer>();
217			try {
218	duarte	72	String query="SELECT "+key+" FROM "+keyTable+";";
219	duarte	67	Statement S=this.mCon.createStatement();
220			ResultSet R=S.executeQuery(query);
221			while (R.next()){
222			idsAL.add(R.getInt(1));
223			}
224			R.close();
225			S.close();
226	duarte	15	}
227			catch (SQLException e){
228	duarte	33	System.err.println("SQLException: " + e.getMessage());
229			System.err.println("SQLState: " + e.getSQLState());
230	duarte	72	System.err.println("Couldn't get all indices from columnn "+key+" in table "+keyTable+" from "+MASTERDB+" database in "+MASTERHOST+", exiting.");
231	duarte	15	System.exit(2);
232			}
233	duarte	67	ids=new int[idsAL.size()];
234			for (int i=0;i<idsAL.size();i++){
235			ids[i]=idsAL.get(i);
236			}
237			return ids;
238	duarte	15	}
239	duarte	35	/**
240	duarte	38	* To get all ids and clients_names pairs for a certain key. Useful when need to submit to all hosts using qsub -q
241			* @param key the name of the key
242	duarte	67	* @return HashMap with keys = indices, and values = node names where the corresponding index is stored
243	duarte	38	*/
244	duarte	67	public HashMap<Integer,String> getAllIdxAndClients (String key){
245	duarte	38	this.setKey(key);
246	duarte	67	HashMap<Integer,String> idsAndClients=new HashMap<Integer,String>();
247	duarte	38	try {
248	duarte	72	String query="SELECT a."+key+",c.client_name FROM "+keyTable+" AS a INNER JOIN clients_names AS c ON (a.client_id=c.client_id);";
249	duarte	67	Statement S=this.mCon.createStatement();
250			ResultSet R=S.executeQuery(query);
251			while (R.next()){
252			idsAndClients.put(R.getInt(1),R.getString(2));
253			}
254			R.close();
255			S.close();
256	duarte	38	}
257			catch (SQLException e){
258			System.err.println("SQLException: " + e.getMessage());
259			System.err.println("SQLState: " + e.getSQLState());
260			System.err.println("Couldn't get all indices/client_names pairs from table "+keyTable+" from "+MASTERDB+" database in "+MASTERHOST+", exiting.");
261			System.exit(2);
262			}
263	duarte	67	return idsAndClients;
264	duarte	38	}
265
266			/**
267	duarte	35	* To get client_id for a certain idx and key
268			* @param key the key name
269			* @param idx the id value for that key
270			* @return the client_id for node that has the data for the idx for that key
271			*/
272	duarte	15	//TODO will need to change the query. In general this method would return more than 1 client_id if the idx is not unique
273			public int getHostId4Idx (String key,int idx) {
274			int hostId=0;
275			this.setKey(key);
276			String query;
277			int countCids=0;
278	duarte	81	query="SELECT count(client_id) FROM "+keyTable+" WHERE "+key+"="+idx+";";
279			countCids=this.mCon.getIntFromDb(query);
280			if (countCids!=1){
281			System.err.println("the query was: "+query);
282			System.err.println("Error! the count of client_ids for idx "+key+"= "+idx+" is " +countCids+
283			". It must be 1! The values were taken from host: "+MASTERHOST+", database: "+MASTERDB+", table: "+keyTable+". Check what's wrong! Exiting now.");
284			System.exit(2);
285	duarte	15	}
286	duarte	81	else {
287			query="SELECT client_id FROM "+keyTable+" WHERE "+key+"="+idx+";";
288			hostId=this.mCon.getIntFromDb(query);
289	duarte	15	}
290			return hostId;
291			}
292
293			public void insertIdxInMaster(String key, int clientId) {
294			String query;
295			this.setKey(key);
296			try {
297			query="INSERT INTO "+this.keyTable+" (client_id) VALUES ("+clientId+");";
298	duarte	81	this.mCon.executeSql(query);
299	duarte	15	}
300			catch (SQLException E) {
301	duarte	33	System.err.println("SQLException: " + E.getMessage());
302			System.err.println("SQLState: " + E.getSQLState());
303	duarte	72	System.err.println("Couldn't insert new "+this.key+" in master table "+this.getKeyTable()+". The client_id for it was "+clientId+". Exiting.");
304	duarte	15	System.exit(2);
305			}
306			}
307
308			public void insertIdxInMaster(String keySrc,String keyDest,int idxSrc) {
309			this.setKey(keySrc);
310			int clientId=0;
311			clientId=this.getHostId4Idx(keySrc,idxSrc);
312			insertIdxInMaster(keyDest,clientId);
313			}
314
315			public int getLastInsertId(String key) {
316			int lastIdx=0;
317			this.setKey(key);
318			String query = "";
319	duarte	81	query = "SELECT LAST_INSERT_ID() FROM "+this.keyTable+" LIMIT 1;";
320			lastIdx=this.mCon.getIntFromDb(query);
321	duarte	15	return lastIdx;
322	duarte	81	}
323	duarte	21
324			public int[][] getIdxSet(String key) {
325			int[][] indMatrix=null;
326			this.setKey(key);
327			String query;
328			Statement S;
329			ResultSet R;
330			try {
331	duarte	81	// STEP 1 -- getting set of all client_ids
332	duarte	21	query="SELECT count(distinct client_id) FROM "+keyTable+";";
333			int count=0;
334	duarte	81	count=this.mCon.getIntFromDb(query);
335			S=this.mCon.createStatement();
336	duarte	21	query="SELECT DISTINCT client_id FROM "+keyTable+" ORDER BY client_id;";
337			R=S.executeQuery(query);
338
339			// STEP 2 -- putting sets of indices counts into temp tables c_<client_id> with a serial auto_increment field
340			int[] clids=new int[count]; //array to store all client_ids. To be used in loops later
341			int i=0;
342			while (R.next()){
343			Statement Sloop=this.mCon.createStatement();
344			int clid=R.getInt(1);
345	duarte	72	query="CREATE TEMPORARY TABLE c_"+clid+" (serial int(11) NOT NULL AUTO_INCREMENT,"+key+" int(11),client_id int(11), PRIMARY KEY(serial));";
346	duarte	21	Sloop.executeUpdate(query);
347	duarte	72	query="INSERT INTO c_"+clid+" ("+key+",client_id) SELECT "+key+",client_id FROM "+keyTable+" WHERE client_id="+clid+";";
348	duarte	21	Sloop.executeUpdate(query);
349			clids[i]=clid;
350			i++;
351			Sloop.close();
352			}
353
354			// STEP3 -- merging all c_<client_id> tables into a temp table tmp_allcs and selecting the client_id with the maximum count
355			//query="SELECT client_id,count() as c FROM c_34 GROUP BY client_id UNION SELECT client_id,count() as c FROM c_32 GROUP BY client_id;";
356			query="DROP TABLE IF EXISTS tmp_allcs;";
357			S.executeUpdate(query);
358			//this table must be permanent! otherwise cannot do the select max(c) later
359			query="CREATE TABLE IF NOT EXISTS tmp_allcs (client_id int(11), c int(11)) ENGINE=MEMORY;";
360			S.executeUpdate(query);
361			String unionStr="SELECT client_id,count(*) AS c FROM c_"+clids[0]+" GROUP BY client_id";
362			for (i=1;i<clids.length;i++) {
363			unionStr+=" UNION SELECT client_id,count(*) AS c FROM c_"+clids[i]+" GROUP BY client_id";
364			}
365			query="INSERT INTO tmp_allcs "+unionStr+";";
366			S.executeUpdate(query);
367			query="SELECT client_id,c FROM tmp_allcs WHERE c=(SELECT max(c) FROM tmp_allcs);";
368			R=S.executeQuery(query);
369			int clidMaxIdxCount=0;
370			int maxIdxCount=0;
371			if (R.next()) {
372			clidMaxIdxCount=R.getInt(1);
373			maxIdxCount=R.getInt(2);
374			}
375			query="DROP TABLE tmp_allcs;";
376			S.executeUpdate(query);
377
378			// STEP 4 -- join all c_<client_id> tables into a table with a serial column, and c_<client_id> columns each of them with the indices for each client_id
379			//query="SELECT c_34.serial,c_34.asu_id AS c_34,c_32.asu_id AS c_32,c_36.asu_id AS c_36 FROM c_34 LEFT JOIN c_32 ON (c_34.serial=c_32.serial) LEFT JOIN c_36 ON (c_34.serial=c_36.serial);";
380	duarte	72	String selectStr="c_"+clidMaxIdxCount+".serial, c_"+clidMaxIdxCount+"."+key+" AS c_"+clidMaxIdxCount;
381	duarte	21	String fromStr="c_"+clidMaxIdxCount;
382			for (i=0;i<clids.length;i++) {
383			if (clids[i]!=clidMaxIdxCount){
384	duarte	72	selectStr+=", c_"+clids[i]+"."+key+" AS c_"+clids[i];
385	duarte	21	fromStr+=" LEFT JOIN c_"+clids[i]+" ON (c_"+clidMaxIdxCount+".serial=c_"+clids[i]+".serial)";
386			}
387			}
388			query="CREATE TEMPORARY TABLE indices_matrix "+"SELECT "+selectStr+" FROM "+fromStr+";";
389			S.executeUpdate(query);
390
391			// STEP 5 -- put the table into a 2-dimensional array and return it
392			indMatrix = new int[maxIdxCount][clids.length];
393			query="SELECT * FROM indices_matrix";
394			R=S.executeQuery(query);
395			i=0;
396			while (R.next()) {
397			for (int j=0;j<clids.length;j++){
398	duarte	22	indMatrix[i][j]=R.getInt(j+2);
399	duarte	21	}
400			i++;
401			}
402			R.close();
403			S.close();
404			}
405			catch (SQLException e){
406	duarte	33	System.err.println("SQLException: " + e.getMessage());
407			System.err.println("SQLState: " + e.getSQLState());
408	duarte	72	System.err.println("Couldn't get the indices set from columnn "+key+" in table "+keyTable+" from "+MASTERDB+" database in "+MASTERHOST+", exiting.");
409	duarte	21	System.exit(2);
410			}
411			return indMatrix;
412			}
413
414
415	duarte	15	}