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annotate m-toolbox/classes/+utils/@mysql/connect.m @ 40:977eb37f31cb database-connection-manager

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User friendlier errors from utils.mysql.connect
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 18:04:03 +0100
parents 18e956c96a1b
children
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18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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1 function conn = connect(hostname, database, username, password)
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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2 % CONNECT Opens a connection to the given database.
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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3 %
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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4 % CALL:
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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5 %
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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6 % conn = utils.mysql.connect(hostname, database, username, password)
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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7 %
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977eb37f31cb User friendlier errors from utils.mysql.connect
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8 % This function returns a Java java.sql.Connection object.
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9 %
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977eb37f31cb User friendlier errors from utils.mysql.connect
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10 % On authetication error an utils:mysql:connect:AccessDenied exception
977eb37f31cb User friendlier errors from utils.mysql.connect
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11 % is thrown. On other errors an utils:mysql:connect:ConnectionError
977eb37f31cb User friendlier errors from utils.mysql.connect
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12 % exception is thrown.
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13
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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14 % informative message
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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15 import utils.const.*
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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16 utils.helper.msg(msg.PROC1, 'connection to mysql://%s/%s username=%s', hostname, database, username);
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17
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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18 % connection credential
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19 uri = sprintf('jdbc:mysql://%s/%s', hostname, database);
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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20 db = javaObject('com.mysql.jdbc.Driver');
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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21 pl = javaObject('java.util.Properties');
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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22 pl.setProperty(db.USER_PROPERTY_KEY, username);
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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23 pl.setProperty(db.PASSWORD_PROPERTY_KEY, password);
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18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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25 try
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26 % connect
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27 conn = db.connect(uri, pl);
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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28 catch ex
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977eb37f31cb User friendlier errors from utils.mysql.connect
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29 % exceptions handling in matlab sucks
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18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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30 if strcmp(ex.identifier, 'MATLAB:Java:GenericException')
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977eb37f31cb User friendlier errors from utils.mysql.connect
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31 % extract exception class and message
977eb37f31cb User friendlier errors from utils.mysql.connect
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32 lines = regexp(ex.message, '\n', 'split');
977eb37f31cb User friendlier errors from utils.mysql.connect
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33 p = strfind(lines{2}, ': ');
977eb37f31cb User friendlier errors from utils.mysql.connect
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34 id = lines{2}(1:p(1)-1);
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35 message = lines{2}(p(1)+2:end);
977eb37f31cb User friendlier errors from utils.mysql.connect
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36 % some notable cases
977eb37f31cb User friendlier errors from utils.mysql.connect
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37 switch id
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38 case 'java.sql.SQLException'
977eb37f31cb User friendlier errors from utils.mysql.connect
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39 throwAsCaller(MException('utils:mysql:connect:AccessDenied', '### access denied: %s', message))
977eb37f31cb User friendlier errors from utils.mysql.connect
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40 case 'com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException'
977eb37f31cb User friendlier errors from utils.mysql.connect
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41 throwAsCaller(MException('utils:mysql:connect:ConnectionError', '### connection error: %s. check database name', message))
977eb37f31cb User friendlier errors from utils.mysql.connect
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42 case 'com.mysql.jdbc.exceptions.jdbc4.CommunicationsException'
977eb37f31cb User friendlier errors from utils.mysql.connect
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43 throwAsCaller(MException('utils:mysql:connect:ConnectionError', '### connection error: %s. check hostname', message))
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18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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44 end
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977eb37f31cb User friendlier errors from utils.mysql.connect
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45 % user friendlier exception
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46 throwAsCaller(MException('utils:mysql:connect:ConnectionError', '### connection error: %s: %s', id, message))
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18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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47 end
18e956c96a1b Add LTPDADatabaseConnectionManager implementation. Matlab code
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48 rethrow(ex);
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49 end
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50 end