annotate m-toolbox/html_help/help/ug/repo_gui_query_content.html @ 39:11e3ed9d2115 database-connection-manager

Implement databases listing in database connection dialog
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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1 <p>
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2 Querying an LTPDA repository is done using standard SQL statements. The repository GUI
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3 presents the user with the possibility to graphically build SQL statements which avoids
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4 learning SQL syntax. Currently, the SQL statements that can be built in this way are
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5 restricted to queries on a single database table. High-level queries, searching more database tables at once, are implemented in the following panel.
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6 </p>
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7 <p>
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8 The repository GUI has a query panel which looks like the figure below:
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9 </p>
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10 <br>
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11 <br>
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12 <img src="images/repo_gui_query_1.png" alt="Repo GUI Query">
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13 <br>
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14 <br>
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15 <p>
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16 In this figure, you see that the user has built a query to select all objects
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17 submitted on the 24th February 2008. The results will contain the object id,
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18 the submitted date, the experiment title, the experiment description, and the analysis
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19 description. The results will be sorted in descending order of the object id.
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20 </p>
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21 <p>
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22 Executing the query (click the 'Execute query' button) produces the results table
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23 shown below.
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24 </p>
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25 <br>
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26 <br>
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27 <img src="images/repo_gui_query_2.png" alt="Repo GUI Query Results">
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28 <br>
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29 <br>
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30 <p>
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31 The query string that is actually executed is presented in the text edit
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32 box above the 'Execute query' button. This query string can be edited to allow for finer
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33 control over the query. This is meant for users who already have a working knowledge of MySQL
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34 SQL syntax.
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35 </p>
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36