Prof. Edwar Saliba Júnior

Transcription

1 2 3 /** 4 * 5 Cynthia Lopes 6 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; t; 12 import java.sql.connection; 13 import java.sql.drivermanager; r; 14 import java.sql.resultset; t; 15 import java.io. o.bufferedreader; r; 16 import java.io. o.filereader; 17 import java.util. l.arraylist; 18 import java.util. l.logging.level; 19 import java.util. l.logging.logger; public final class Database package Conexao; private Access informationdb; private Connection connectiondb; private Statement querydb; private boolean enablemessages; private final String c_database_file = "AjaxEx08.txt" t"; public Database() throws FileNotFoundException, n, ClassNotFoundException FileReader file = new FileReader(c_DATABASE_FILE) E); BufferedReader reader = new BufferedReader( r(file); String databasename; e; databasename = reader. r.readline( e String password = reader.readline() String host = reader.readline() reader. r.close() file. e.close() this. s.informationdb = new Access(dataBaseName, e, password, host); this. s.connectiontodb( B this. s.enablemessages = false; catch (IOException ex) Logger. r.getlogger(database.class.getname()).log(level.severe, null, ex); public Database(String databasename, e, String password, String host) this. s.informationdb = new Access(dataBaseName, e, password, host); this. s.connectiontodb( B this. s.enablemessages = false; catch (Exception ex) Logger. r.getlogger(database.class.getname()).log(level.severe, null, ex); public Database(Access info) this. s.informationdb = info; this. s.enablemessages = false; public void connectiontodb() throws ClassNotFoundException this. s.startdriver() connectiondb = DriverManager.getConnection( this.informationdb.geturl() (), this.informationdb.getusuario() (), this.informationdb.getsenha() ());); if (this. s.enablemessages) s) System.out.println("Connection with database '" + this. s.informationdb. B.getNomeBD( D() + "' sucess completed."."); 1.1 of :30:39

2 this. s.querydb = this. s.connectiondb. B.createStatement( t( ResultSet. t.type_scroll_insensitive, ResultSet. t.concur_read_only ); catch (SQLException e) System. m.out.println(e.tostring() ()); public void startdriver() throws ClassNotFoundException Class.forName("org.postgresql.Driver"); public void insertvalues(string tablename, String fieldsnames[ s[], String fieldsvalues[ s[]) throws SQLException String query = "INSERT INTO \"" + tablename + "\" ("; query += returnfieldsnames(fieldsnames) s) + ")"; query += " VALUES("; query += returnvalues( s(fieldsvalues, s, true) + ")"; if (this. s.enablemessages) s) this. s.querydb. B.execute(query); this. s.connectiondb. B.commit() public void deletevalues(string tablename, String condition) n) throws SQLException String query = "DELETE FROM \"" + tablename + "\""; if (this. s.enablemessages) s) this. s.querydb. B.execute(query); this. s.connectiondb. B.commit() public void updatevalues(string tablename, String fields[], String values[], String condition) throws SQLException String query = "UPDATE \"" + tablename + "\" SET "; query += this.returnsetvalues( s(fields, s, values) s); if (this. s.enablemessages) s) this. s.querydb. B.execute(query); this. s.connectiondb. B.commit() public boolean existrow(string table, String condition) throws SQLException boolean foundrow; String query = "SELECT 1 "; query += " FROM \"" + table + "\""; foundrow = resultset.first() if (this. s.enablemessages) s) 2.1 of :30:39

3 return (foundrow); public void printselection(string table, String fields[], String condition) throws SQLException query += returnfieldsnames(fields); query += " FROM \"" + table + "\""; if (this. s.enablemessages) s) while (resultset.next( t()) String print = "";"; for (int i = 0; i < fields.length; i++) +) print += " " + resultset.getstring( g(fields[i]) + " \t"; System. m.out.println(print); public ArrayList selection(string table, boolean putquotationmarksonthefields, String fields[ s[], String condition) ArrayList resultslist = new ArrayList() if (putquotationmarksonthefields) s) query += returnfieldsnames( s(fields); else query += returnvalues( s(fields, s, putquotationmarksonthefields); query += " FROM " + table; B.executeQuery(query) y); if (this. s.enablemessages) s) System.out.println(query); resultset.beforefirst( t while (resultset.next( t()) String[] row = new String[resultSet.getMetaData( a(). ).getcolumncount()]; for (int i = 0; i < resultset.getmetadata() ().getcolumncount i++) row[ w[i] = resultset.getstring( g(i + 1); resultslist. t.add( d(row) w); catch (SQLException ex) System. m.out.println("exceção SQL: " + ex); return resultslist; public ResultSet selection(string table, String fields[], boolean putquotationmarksonthefields, String condition, boolean pointertofirstrecord) throws SQLException if (putquotationmarksonthefields) query += returnfieldsnames(fields); else query += returnvalues( s(fields, putquotationmarksonthefields); query += " FROM \"" + table + "\""; 3.1 of :30:39

4 if( f(pointertofirstrecord) d) resultset.next() return (resultset) t); public ResultSet selection(string query) throws SQLException resultset.next() return (resultset) t); public void printjoinselection(string tables[ s[], String fields[ s[], String condition) throws SQLException query += returnfieldsnames(fields); query += " FROM " + returnfieldsnames(tables) s); if (this. s.enablemessages) s) for (int i = 0; i < fields.length; i++) +) int dotposition = fields[i]. ].indexof('.'); fields[ s[i] = fields[i]. ].substring(dotposition + 1, fields[ s[i] i].length( h()) )); while (resultset.next( t()) String print = "";"; for (int i = 0; i < fields.length; i++) +) print += " " + resultset.getstring( g(fields[i]) + " \t"; System. m.out.println(print); public String returnvalues(string values[ s[], boolean putquotationmarks) String vals = ""; if (putquotationmarks) for (int i = 0; i < values.length - 1; i++) +) vals += "\'" + values[i] + "\', "; vals += "\'" + values[values.length - 1] + "\'"; else for (int i = 0; i < values.length - 1; i++) +) vals += values[i] + ", "; vals += values[values. s.length - 1]; return vals; public String returnfieldsnames(string values[]) String vals = "\""; for (int i = 0; i < values.length - 1; i++) +) vals += values[ s[i] + "\", \"";"; 4.1 of :30:39

5 vals += values[values. s.length - 1] + "\""; return vals; public String returnsetvalues(string fields[], String values[]) String vals = ""; for (int i = 0; i < values.length - 1; i++) +) vals += "\"" + fields[i] + "\" = " + (values[ s[i] i].equals( s("") ")? "\'\'" : "\'" + values[i] + "\'") + ", "; vals += "\"" + fields[ s[fields.length - 1] + "\" = " + (values[ s[values.length - 1]. ].equals("")")? "\'\'" : "\'" + values[values. s.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 = "";"; vetor += "";"; for (int i = 0; i < v.length; i++) if ((i < (v. v.length - 1)) && (!((i(i > 0) && (String.valueOf(v[i]).equals("0" 0")) )))) vetor += String. g.valueof (v[i]) + ","; else vetor += String. g.valueof (v[i]); break; vetor += "";"; return (vetor); /** * Converte um campo do tipo "array" do PostgreSQL (String) num vetor de * inteiros. * "String" - Ex. x.: 0,80,17,71,13,0 "int []" - Ex.: [0,80,17,71,13,0] */ public int[ t[] converttointarray(string v) v = v.trim( m int vetor[] = new int[ t[v. v.split( t(", ",", -1).length]; int j = 0; String n = ""; for (int i = 0; i < v.length() i++) if ((v. v.charat( t(i)!= '')') && (v. v.charat(i)!= '')) if ((v.charat( t(i)!= ',')') && (v. v.charat(i)!= ' ')) n += v.substring(i, i + 1); else vetor[ r[j+ j++] +] = Integer.parseInt(n); n = ""; return (vetor); public void closedbconnection() throws SQLException 5.1 of :30:39

6 this. s.connectiondb. B.close( e public boolean isenablemessages() return enablemessages; s; public void setenablemessages(boolean enablemessages) this. s.enablemessages = enablemessages; public void finalize() throws SQLException, Throwable super.finalize() closedbconnection( n private Object getfieldvalue(string tablename, String fieldname, e, String condition) throws SQLException Object value = null; l; String fields[] = fieldname; ResultSet rs = selection(tablename, e, fields, true, condition, n, true) e); if (rs. s.first( t()) value = rs.getobject(fieldname) e); public String getstringfieldvalue(string tables, String fields, String condition) throws SQLException String value = "";"; val = getfieldvalue( e(tables, fields, condition); if (val!= null) l) value = val. l.tostring() public int getintfieldvalue(string tables, String fields, String condition) throws SQLException int value = 0; val = getfieldvalue( e(tables, fields, condition); if (val!= null) l) value = Integer. r.valueof(val. l.tostring() ());); public float getfloatfieldvalue(string tables, String fields, String condition) throws SQLException float value = 0; val = getfieldvalue( e(tables, fields, condition); if (val!= null) l) value = Float. t.valueof(val. l.tostring() ());); public boolean getbooleanfieldvalue(string tables, String fields, String condition) throws SQLException boolean value = false; val = getfieldvalue( e(tables, fields, condition) n); 6.1 of :30:39

7 if (val!= null) l) value = Boolean. n.valueof(val. l.tostring() ());); public int getnumberofrowsintable(string table, boolean putquotation) throws SQLException ResultSet rs; if (putquotation) rs = selection(" ("SELECT count(*) " + " FROM \"" + table + "\""); else rs = selection(" ("SELECT count(*) " + " FROM " + table) e); int value = rs.getint( t(1) 1); return value; 7.1 of :30:39