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duarte |
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package tools; |
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import java.sql.*; |
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public class utils4DB { |
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private utils4DB() {}; |
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public static float[] getRange(Connection C, String table, String column) { |
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String query = ""; |
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Statement S; |
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ResultSet R; |
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float[] range = new float[2]; |
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try { |
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query = "SELECT MIN("+column+"), MAX("+column+") FROM "+table+";"; |
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S = C.createStatement(); |
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R = S.executeQuery(query); |
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if (R.next()) { |
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range[0] = R.getFloat(1); |
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range[1] = R.getFloat(2); |
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} |
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R.close(); |
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S.close(); |
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} // end try |
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catch (SQLException E) { |
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System.out.println("SQLException: " + E.getMessage()); |
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System.out.println("SQLState: " + E.getSQLState()); |
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System.out.println("VendorError: " + E.getErrorCode()); |
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} // end catch |
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return range; |
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} |
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public static float[] getRange(Connection C, String table, String column, String selection) { |
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String query = ""; |
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Statement S; |
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ResultSet R; |
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float[] range = new float[2]; |
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try { |
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query = "SELECT MIN("+column+"), MAX("+column+") FROM "+table+" WHERE ("+selection+");"; |
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S = C.createStatement(); |
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R = S.executeQuery(query); |
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if (R.next()) { |
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range[0] = R.getFloat(1); |
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range[1] = R.getFloat(2); |
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} |
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R.close(); |
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S.close(); |
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} // end try |
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catch (SQLException E) { |
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System.out.println("SQLException: " + E.getMessage()); |
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System.out.println("SQLState: " + E.getSQLState()); |
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System.out.println("VendorError: " + E.getErrorCode()); |
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} // end catch |
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return range; |
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} |
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public static void getDbSizeInfo(String connFile, String DB) { |
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Connection myConnection; |
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mySQLConnect SQLC; |
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double data = 0, index = 0, table_data = 0, table_index = 0, GB = Math.pow(2, 30); |
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String Query = null, table = null; |
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Statement Stmt = null; |
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ResultSet RS = null; |
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SQLC = new mySQLConnect(); |
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SQLC.readConnectionFile(connFile); |
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myConnection = SQLC.openConnection(); |
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try { |
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Query = "SHOW TABLE STATUS FROM "+DB; |
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Stmt = myConnection.createStatement(); |
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RS = Stmt.executeQuery(Query); |
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while (RS.next()) { |
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table = RS.getString("Name"); |
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table_data = RS.getDouble("Data_length"); |
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table_index = RS.getDouble("Index_length"); |
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data += RS.getDouble("Data_length"); |
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index += RS.getDouble("Index_length"); |
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System.out.println("Table "+table+"##data:"+table_data+", index:"+table_index); |
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} |
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RS.close(); |
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Stmt.close(); |
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System.out.println("Database "+DB+" needs "+((data+index)/GB)+ " GB (data:"+(data/GB)+", index:"+(index/GB)+")."); |
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} |
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catch (SQLException E) { |
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System.out.println("SQLException: " + E.getMessage()); |
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System.out.println("SQLState: " + E.getSQLState()); |
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System.out.println("VendorError: " + E.getErrorCode()); |
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} // end try/catch connection |
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SQLC.closeConnection(myConnection); |
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} |
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} |
