Prof. Edwar Saliba Júnior

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1 1 package Conexao; * 5 Cynthia Lopes 6 Edwar Saliba Júnior 7 8 import java.io.filenotfoundexception; 9 import java.io.ioexception; 10 import java.sql.sqlexception; 11 import java.sql.statement; 12 import java.sql.connection; 13 import java.sql.drivermanager; 14 import java.sql.resultset; 15 import java.io.bufferedreader; 16 import java.io.filereader; 17 import java.util.arraylist; 18 import java.util.logging.level; 19 import java.util.logging.logger; public final class Database { private Access informationdb; private Connection connectiondb; private Statement querydb; private boolean enablemessages; private final String c_database_file = "JSP_Ex02.txt"; private int dbms; // Sistema Gerenciador de Banco de Dados * Este método retorna um número inteiro que corresponde ao Sistema Gerenciador * de Banco de Dados que está sendo tratado pela classe Database. O valor a * ser retornado poderá ser: * 1 - quando o SGBD utilizado for o PostgreSQL e * 2 - quando o SGBD utilizado for o MySQL. public int getdbms() { return dbms; * Este método configura um parâmetro importante para se trabalhar com a * classe Database, nele deve-se escolher entre dois tipos de Sistemas * Gerenciadores de Banco de Dados (PostgreSQL e MySQL). O valor a ser * passado para o parâmetro "sgdb" deverá ser: * 1 - quando o SGBD utilizado for o PostgreSQL e * 2 - quando o SGBD utilizado for o MySQL. dbms public void setdbms(int dbms) { this.dbms = dbms; public Database() throws FileNotFoundException, ClassNotFoundException { FileReader file = new FileReader(c_DATABASE_FILE); BufferedReader reader = new BufferedReader(file); String databasename; databasename = reader.readline(); String password = reader.readline(); String host = reader. r.readline(); reader.close(); file.close(); this.informationdb = new Access(dataBaseName, password, host); this.connectiontodb() (); this.enablemessages = true; // Valor padrão para o atributo é o SGBD PostgreSQL. this.dbms = 1; catch (IOException ex) { Logger.getLogger(Database.class.getName()).log(Level.SEVERE, null, ex); public Database(String databasename, String password, String host) { this.informationdb = new Access(dataBaseName, password, host); this.connectiontodb() (); this.enablemessages = false; catch (Exception ex) { Logger.getLogger(Database.class.getName()).log(Level.SEVERE, null, ex); 1.1 of :01:02

2 public Database(Access info) { this.informationdb = info; this.enablemessages = false; * O parâmetro "tipobanco" deve receber: - 1 para PostgreSQL - 2 para MySQL * tipobanco (int) ClassNotFoundException public void connectiontodb() throws ClassNotFoundException { this.startdriver(); connectiondb = DriverManager.getConnection( this.informationdb.geturl(), this.informationdb.getusuario(), this.informationdb.getsenha()); System.out.println("Connection with database '" + this.informationdb. B.getNomeBD() + "' sucess completed."); this.querydb = this.connectiondb. B.createStatement( ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY ); catch (SQLException e) { System.out.println(e.toString( g()); public void startdriver() throws ClassNotFoundException { switch (dbms) { case 1: Class.forName("org.postgresql.Driver"); break; case 2: Class.forName("com.mysql.jdbc.Driver"); public void insertvalues(string tablename, String fieldsnames[], String fieldsvalues[] []) String query; boolean putquotationmarks; putquotationmarks = dbms == 1; query = "INSERT INTO \"" + tablename + "\" ("; query += returnfieldsnames(fieldsnames) + ")"; query += " VALUES("; query += returnvalues(fieldsvalues, true) + ")"; else { query = "INSERT INTO " + tablename + " ("; query += returnfieldsnames(fieldsnames) + ")"; query += " VALUES("; query += returnvalues(fieldsvalues, true) + ")"; this.querydb.execute(query); this.connectiondb.commit(); public void deletevalues(string tablename, String query; query = "DELETE FROM \"" + tablename + "\""; else { query = "DELETE FROM " + tablename + " "; this.querydb.execute(query); 2.1 of :01:02

3 this.connectiondb.commit(); public void updatevalues(string tablename, String fields[], String values[], String query; query = "UPDATE \"" + tablename + "\" SET "; query += this.returnsetvalues(fields, values, true); else { query = "UPDATE " + tablename + " SET "; query += this.returnsetvalues(fields, values, false); this.querydb.execute(query); this.connectiondb.commit(); public boolean existrow(string table, boolean foundrow; String query = "SELECT 1 "; query += " FROM \"" + table + "\""; foundrow = resultset.first(); return (foundrow); public void printselection(string table, String fields[], String condition) query += " FROM \"" + table + "\""; while (resultset.next()) { String print = ""; for (int i = 0; i < fields.length; i++) { print += " " + resultset.getstring(fields[i]) + " \t"; System.out.println(print); public ArrayList selection(string table, boolean putquotationmarksonthefields, String fields[], String condition) { ArrayList resultslist = new ArrayList(); if (putquotationmarksonthefields) s) { else { query += returnvalues(fields, s, putquotationmarksonthefields); query += " FROM " + table; 3.1 of :01:02

4 query += " FROM " + table; resultset.beforefirst(); while (resultset.next()) { String[] row = new String[resultSet.getMetaData().getColumnCount()]; for (int i = 0; i < resultset.getmetadata().getcolumncount(); i++) { row[i] = resultset.getstring(i + 1); resultslist.add(row); catch (SQLException ex) { System.out.println("Exceção SQL: " + ex); return resultslist; public ResultSet selection(string table, String fields[], boolean putquotationmarksonthefields, String condition, boolean pointertofirstrecord) if (putquotationmarksonthefields) { query += " FROM \"" + table + "\""; else { query += " FROM " + table + " "; else { query += returnvalues(fields, putquotationmarksonthefields); query += " FROM " + table; if (pointertofirstrecord) { resultset.next(); return (resultset); public ResultSet selection(string query) resultset.next(); return (resultset); public void printjoinselection(string tables[], String fields[] [], query += " FROM " + returnfieldsnames(tables); for (int i = 0; i < fields.length; i++) { int dotposition = fields[i].indexof('.'); fields[i] = fields[i] i].substring(dotposition + 1, fields[i].length()); while (resultset.next()) { String print = ""; for (int i = 0; i < fields.length; i++) { print += " " + resultset.getstring(fields[i]) + " \t"; 4.1 of :01:02

5 System.out.println(print); public String returnvalues(string values[], boolean putquotationmarks) { String vals = ""; vals += "\'" + values[i] + "\', "; vals += "\'" + values[values.length - 1] + "\'"; else { vals += values[i] + ", "; vals += values[values.length - 1]; return vals; public String returnfieldsnames(string values[]) { boolean putquotationmarks; putquotationmarks = dbms == 1; String vals; vals = "\""; vals += values[i] + "\", \""; vals += values[values.length - 1] + "\""; else { vals = ""; vals += values[i] + ", "; vals += values[values.length - 1]; return vals; public String returnsetvalues(string fields[], String values[] [], boolean putquotationmarks) { String vals = ""; vals += "\"" + fields[i] + "\" = " + (values[i].equals("")? "\'\'" : "\'" + values[ s[i] + "\'") + ", "; else { vals += "" + fields[i] + " = " + (values[i].equals("")? "\'\'" : "\'" + values[ s[i] + "\'") + ", "; vals += "\"" + fields[fields.length - 1] + "\" = " + (values[values.length - 1].equals("")? "\'\'" : "\'" + values[values.length - 1] + "\'"); else { vals += "" + fields[fields.length - 1] + " = " + (values[values.length - 1].equals("")? "\'\'" : "\'" + values[values.length - 1] + "\'"); return vals; * Converte um vetor de inteiros para um formato aceitável por um campo do * tipo "array" do PostgreSQL. * Vetor de Inteiros "'{ val1, val2,... '" public String converttostringarray(int v[] []) { String vetor = ""; 5.1 of :01:02

6 vetor += "{"; for (int i = 0; i < v.length; i++) { if ((i < (v.length - 1)) && (!((i(i > 0) && (String.valueOf(v[i]).equals("0"))))) { vetor += String.valueOf(v[i]) + ","; else { vetor += String.valueOf(v[i]); break; vetor += ""; return (vetor); * Converte um campo do tipo "array" do PostgreSQL (String) num vetor de * inteiros. * "String" - Ex.: {0,80,17,71,13,0 "int []" - Ex.: [0,80,17,71,13,0] public int[] converttointarray(string v) { v = v.trim() (); int vetor[] = new int[v.split(",", -1).length]; int j = 0; String n = ""; for (int i = 0; i < v.length(); i++) { if ((v.charat(i)!= '{') && (v.charat(i)!= '')) { if ((v.charat(i)!= ',') && (v.charat(i)!= ' ')) { n += v.substring(i, i + 1); else { vetor[j++] = Integer.parseInt(n); n = ""; return (vetor); public void closedbconnection() this.connectiondb.close() (); public boolean isenablemessages() { return enablemessages; public void setenablemessages(boolean enablemessages) { this.enablemessages = enablemessages; public void finalize() throws SQLException, Throwable { super.finalize(); closedbconnection(); private Object getfieldvalue(string tablename, String fieldname, boolean putquotationmarks; Object value = null; String fields[] = {fieldname; /* Se o banco não for PostgreSQL, não colocar aspas no campo e tampouco na tabela. putquotationmarks = (dbms == 1); ResultSet rs = selection( n(tablename, fields, putquotationmarks, condition, n, true); if (rs.first()) { value = rs.getobject( t(fieldname); public String getstringfieldvalue(string tables, String fields, String value = ""; if (val!= null) l) { 6.1 of :01:02

7 if (val!= null) l) { value = val.tostring( g(); public int getintfieldvalue(string tables, String fields, String condition) int value = 0; if (val!= null) { value = Integer.valueOf(val.toString()); public float getfloatfieldvalue(string tables, String fields, String condition) float value = 0; if (val!= null) { value = Float.valueOf (val.tostring()); public boolean getbooleanfieldvalue(string tables, String fields, boolean value = false; if (val!= null) { value = Boolean.valueOf(val.toString()); public int getnumberofrowsintable(string table, boolean putquotation) ResultSet rs; if (putquotation) { rs = selection("select count(*) " + " FROM \"" + table + "\""); else { rs = selection("select count(*) " + " FROM " + table); int value = rs.getint(1); return value; 7.1 of :01:02

Prof. Edwar Saliba Júnior

Prof. Edwar Saliba Júnior 2 3 /** 4 * 5 * @author Cynthia Lopes 6 * @author Edwar Saliba Júnior 7 */ 8 import java.io. o.filenotfoundexception; 9 import java.io. o.ioexception; 10 import java.sql.sqlexception; 11 import java.sql.statement;