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Added chapter usage (documentation)
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Georg Richter
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***********
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Basic usage
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***********
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.. sectionauthor:: Georg Richter <georg@mariadb.com>
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Connecting
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##########
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The basic usage of MariaDB Connector/Python is similiar to other database drivers which
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implement |DBAPI|.
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Below is a simple example of a typical use of MariaDB Connector/Python
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.. literalinclude:: ../examples/basic01.py
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:language: python
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:linenos:
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Before MariaDB Connector/Python can be used, the MariaDB Connector/Python module must be
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imported (line #2)
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Once the mariadb module is loaded, a connection to a database server will be established
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using the method :func:`~mariadb.connect` (line #5).
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In order to be able to communicate with the database server in the form of SQL statements,
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a cursor object must be created first (line #7).
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The method name cursor may be a little misleading: unlike a cursor in MariaDB that can only
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read and return data, a cursor in Python can be used for all types of SQL statements.
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After creating the table mytest, everything is ready to insert some data (line #16): Column values
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that are to be inserted in the database are identified by place holders, the data is then passed in
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the form of a tuple as a second parameter (line #16).
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After creating and populating the table mytest the cursor will be used to retrieve the data (line #20 - line#23).
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Passing parameters to SQL statements
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####################################
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As shown in previous example, passing parameters to SQL statements happens by using placeholders in the statement. By default
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MariaDB Connector/Python uses a question mark as a placeholder, for compatibility reason also %s placeholders are supported. Passing
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parameters is supported in methods :func:`~execute` and :func:`~executemany` of the cursor class.
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Since |MCP| uses binary protocol, escaping strings or binary data like in other database drivers is not required.
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.. code-block:: python
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:linenos:
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# update
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sql= "UPDATE books SET price=? WHERE book_name=?"
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data= (14.90, "Dream of the Red Chamber")
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cursor.execute(sql, data)
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# delete
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sql= "DELETE FROM books WHERE id=?"
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data= (4034,) # Don't forget a comma at the end!
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cursor.execute(sql, data)
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# insert
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sql= "INSERT INTO books (book_name, author_name, price) VALUES (?, ?, ?)"
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data= ("The Lord of the Rings", "J.R.R. Tolkien", 18.99)
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Often there is a requirement to update, delete or insert multiple records. This could be done be using :func:`~execute` in
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a loop, but much more effective is using the :func:`executemany` method, especially when using a MariaDB database server 10.2 and above, which supports a special "bulk" protocol. The executemany() works similiar to execute(), but accepts data as a list of tuples:
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.. code-block:: python
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:linenos:
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# update
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sql= "UPDATE books SET price=? WHERE book_name=?"
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data= [(14.90, "Dream of the Red Chamber"),
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(22.30, "The Master and Margarita"),
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(17.10, "And Then There Were None")]
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cursor.executemany(sql, data)
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# delete
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sql= "DELETE FROM books WHERE id=?"
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data= [(4034,),(12001,),(230,)]
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cursor.executemany(sql, data)
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#insert
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sql= "INSERT INTO books (book_name, author_name, price) VALUES (?, ?, ?)"
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data= [("The Lord of the Rings", "J.R.R. Tolkien", 18.99),
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("Le Petit Prince", "Antoine de Saint-Exupéry", 22.40),
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("Dream of the Red Chamber", "Cao Xueqin", 16.90),
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("The Adventures of Pinocchio", "Carlo Collodi", 17.10)]
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cursor.executemany(sql, data)
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When using executemany(), there are a few restrictions:
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- All tuples must have the same types as in first tuple. E.g. the parameter [(1),(1.0)] or [(1),(None)] are invalid.
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- Special values like None or column default value needs to be indicated by an indicator.
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Using indicators
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****************
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In certain situations, for example when inserting default values or NULL, special indicators must be used.
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.. code-block:: python
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:linenos:
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cursor.execute("CREATE TABLE cakes(id int, cake varchar(100), price decimal(10,2) default 1.99)")
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sql= "INSERT INTO cakes (id, cake, price) VALUES (?,?)"
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data= [(1, "Cherry Cake", 2.10), (2, "Apple Cake", mariadb.indicator_default)]
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cursor.executemany(sql, data)
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Beside the default indicator which inserts the default value of 1.99, the following indicators are supported:
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* indicator_ignore: Ignores the value (only update commands)
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* indicator_null: Value is NULL
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* indicator_row: Don't update or insert row
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.. note::
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* Mixing different parameter styles is not supported and will raise an exception
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* The Python string operator % must not be used. The :func:`~execute` method accepts a tuple or list as second parameter.
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* Placeholders between quotation marks are interpreted as a string.
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* Parameters for :func:`~execute` needs to be passed as a tuple. If only one parameter will be passed, tuple needs to contain a comma at the end.
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* Parameters for :func:`~executemany` need to be passed as a list of tuples.
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Supported Data types
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--------------------
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312
docs/usage.html
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta charset="utf-8" />
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<title>Basic usage — MariaDB Connector/Python 1.0.0 documentation</title>
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<link rel="stylesheet" href="_static/classic.css" type="text/css" />
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<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
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<script id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script>
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<script src="_static/jquery.js"></script>
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<script src="_static/underscore.js"></script>
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<script src="_static/doctools.js"></script>
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<script src="_static/language_data.js"></script>
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<link rel="index" title="Index" href="genindex.html" />
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<link rel="search" title="Search" href="search.html" />
|
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<link rel="next" title="The mariadb module" href="module.html" />
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<link rel="prev" title="Installation" href="install.html" />
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</head><body>
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<div class="related" role="navigation" aria-label="related navigation">
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<h3>Navigation</h3>
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<ul>
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<li class="right" style="margin-right: 10px">
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<a href="genindex.html" title="General Index"
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||||
accesskey="I">index</a></li>
|
||||
<li class="right" >
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<a href="py-modindex.html" title="Python Module Index"
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>modules</a> |</li>
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<li class="right" >
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<a href="module.html" title="The mariadb module"
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accesskey="N">next</a> |</li>
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<li class="right" >
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<a href="install.html" title="Installation"
|
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accesskey="P">previous</a> |</li>
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<li class="nav-item nav-item-0"><a href="index.html">MariaDB Connector/Python 1.0.0 documentation</a> »</li>
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</ul>
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</div>
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<div class="document">
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<div class="documentwrapper">
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<div class="bodywrapper">
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<div class="body" role="main">
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<div class="section" id="basic-usage">
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<h1>Basic usage<a class="headerlink" href="#basic-usage" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="connecting">
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<h2>Connecting<a class="headerlink" href="#connecting" title="Permalink to this headline">¶</a></h2>
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<p>The basic usage of MariaDB Connector/Python is similiar to other database drivers which
|
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implement DB API 2.0 (PEP-249).</p>
|
||||
<p>Below is a simple example of a typical use of MariaDB Connector/Python</p>
|
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<div class="highlight-python notranslate"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
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28</pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="c1"># Import MariaDB Connector/Python module</span>
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<span class="kn">import</span> <span class="nn">mariadb</span>
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<span class="c1"># Establish a connection</span>
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<span class="n">connection</span><span class="o">=</span> <span class="n">mariadb</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">user</span><span class="o">=</span><span class="s2">"myuser"</span><span class="p">,</span> <span class="n">database</span><span class="o">=</span><span class="s2">"test"</span><span class="p">,</span> <span class="n">host</span><span class="o">=</span><span class="s2">"localhost"</span><span class="p">)</span>
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<span class="n">cursor</span><span class="o">=</span> <span class="n">connection</span><span class="o">.</span><span class="n">cursor</span><span class="p">()</span>
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<span class="c1"># Create a database table</span>
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<span class="n">cursor</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s2">"DROP TABLE IF EXISTS mytest"</span><span class="p">)</span>
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<span class="n">cursor</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s2">"CREATE TABLE mytest(id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,"</span>
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<span class="s2">"first_name VARCHAR(100), last_name VARCHAR(100))"</span><span class="p">)</span>
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<span class="c1"># Populate table with some data</span>
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<span class="n">cursor</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s2">"INSERT INTO mytest(first_name, last_name) VALUES (?,?)"</span><span class="p">,</span>
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<span class="p">(</span><span class="s2">"Robert"</span><span class="p">,</span> <span class="s2">"Redford"</span><span class="p">))</span>
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<span class="c1"># retrieve data</span>
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<span class="n">cursor</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s2">"SELECT id, first_name, last_name FROM mytest"</span><span class="p">)</span>
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<span class="c1"># print content</span>
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<span class="n">row</span><span class="o">=</span> <span class="n">cursor</span><span class="o">.</span><span class="n">fetchone</span><span class="p">()</span>
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<span class="nb">print</span><span class="p">(</span><span class="o">*</span><span class="n">row</span><span class="p">,</span> <span class="n">sep</span><span class="o">=</span><span class="s1">'</span><span class="se">\t</span><span class="s1">'</span><span class="p">)</span>
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<span class="c1"># free resources</span>
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<span class="n">cursor</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
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<span class="n">connection</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
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</pre></div>
|
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</td></tr></table></div>
|
||||
<p>Before MariaDB Connector/Python can be used, the MariaDB Connector/Python module must be
|
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imported (line #2)
|
||||
Once the mariadb module is loaded, a connection to a database server will be established
|
||||
using the method <a class="reference internal" href="module.html#mariadb.connect" title="mariadb.connect"><code class="xref py py-func docutils literal notranslate"><span class="pre">connect()</span></code></a> (line #5).</p>
|
||||
<p>In order to be able to communicate with the database server in the form of SQL statements,
|
||||
a cursor object must be created first (line #7).</p>
|
||||
<p>The method name cursor may be a little misleading: unlike a cursor in MariaDB that can only
|
||||
read and return data, a cursor in Python can be used for all types of SQL statements.</p>
|
||||
<p>After creating the table mytest, everything is ready to insert some data (line #16): Column values
|
||||
that are to be inserted in the database are identified by place holders, the data is then passed in
|
||||
the form of a tuple as a second parameter (line #16).</p>
|
||||
<p>After creating and populating the table mytest the cursor will be used to retrieve the data (line #20 - line#23).</p>
|
||||
</div>
|
||||
<div class="section" id="passing-parameters-to-sql-statements">
|
||||
<h2>Passing parameters to SQL statements<a class="headerlink" href="#passing-parameters-to-sql-statements" title="Permalink to this headline">¶</a></h2>
|
||||
<p>As shown in previous example, passing parameters to SQL statements happens by using placeholders in the statement. By default
|
||||
MariaDB Connector/Python uses a question mark as a placeholder, for compatibility reason also %s placeholders are supported. Passing
|
||||
parameters is supported in methods <a class="reference internal" href="cursor.html#execute" title="execute"><code class="xref py py-func docutils literal notranslate"><span class="pre">execute()</span></code></a> and <a class="reference internal" href="cursor.html#executemany" title="executemany"><code class="xref py py-func docutils literal notranslate"><span class="pre">executemany()</span></code></a> of the cursor class.</p>
|
||||
<p>Since MariaDB Connector/Python uses binary protocol, escaping strings or binary data like in other database drivers is not required.</p>
|
||||
<div class="highlight-python notranslate"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
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14</pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="c1"># update</span>
|
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<span class="n">sql</span><span class="o">=</span> <span class="s2">"UPDATE books SET price=? WHERE book_name=?"</span>
|
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<span class="n">data</span><span class="o">=</span> <span class="p">(</span><span class="mf">14.90</span><span class="p">,</span> <span class="s2">"Dream of the Red Chamber"</span><span class="p">)</span>
|
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<span class="n">cursor</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="n">sql</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span>
|
||||
|
||||
<span class="c1"># delete</span>
|
||||
<span class="n">sql</span><span class="o">=</span> <span class="s2">"DELETE FROM books WHERE id=?"</span>
|
||||
<span class="n">data</span><span class="o">=</span> <span class="p">(</span><span class="mi">4034</span><span class="p">,)</span> <span class="c1"># Don't forget a comma at the end!</span>
|
||||
<span class="n">cursor</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="n">sql</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span>
|
||||
|
||||
|
||||
<span class="c1"># insert</span>
|
||||
<span class="n">sql</span><span class="o">=</span> <span class="s2">"INSERT INTO books (book_name, author_name, price) VALUES (?, ?, ?)"</span>
|
||||
<span class="n">data</span><span class="o">=</span> <span class="p">(</span><span class="s2">"The Lord of the Rings"</span><span class="p">,</span> <span class="s2">"J.R.R. Tolkien"</span><span class="p">,</span> <span class="mf">18.99</span><span class="p">)</span>
|
||||
</pre></div>
|
||||
</td></tr></table></div>
|
||||
<p>Often there is a requirement to update, delete or insert multiple records. This could be done be using <a class="reference internal" href="cursor.html#execute" title="execute"><code class="xref py py-func docutils literal notranslate"><span class="pre">execute()</span></code></a> in
|
||||
a loop, but much more effective is using the <a class="reference internal" href="cursor.html#executemany" title="executemany"><code class="xref py py-func docutils literal notranslate"><span class="pre">executemany()</span></code></a> method, especially when using a MariaDB database server 10.2 and above, which supports a special “bulk” protocol. The executemany() works similiar to execute(), but accepts data as a list of tuples:</p>
|
||||
<div class="highlight-python notranslate"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
|
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|
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|
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19</pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="c1"># update</span>
|
||||
<span class="n">sql</span><span class="o">=</span> <span class="s2">"UPDATE books SET price=? WHERE book_name=?"</span>
|
||||
<span class="n">data</span><span class="o">=</span> <span class="p">[(</span><span class="mf">14.90</span><span class="p">,</span> <span class="s2">"Dream of the Red Chamber"</span><span class="p">),</span>
|
||||
<span class="p">(</span><span class="mf">22.30</span><span class="p">,</span> <span class="s2">"The Master and Margarita"</span><span class="p">),</span>
|
||||
<span class="p">(</span><span class="mf">17.10</span><span class="p">,</span> <span class="s2">"And Then There Were None"</span><span class="p">)]</span>
|
||||
<span class="n">cursor</span><span class="o">.</span><span class="n">executemany</span><span class="p">(</span><span class="n">sql</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span>
|
||||
|
||||
<span class="c1"># delete</span>
|
||||
<span class="n">sql</span><span class="o">=</span> <span class="s2">"DELETE FROM books WHERE id=?"</span>
|
||||
<span class="n">data</span><span class="o">=</span> <span class="p">[(</span><span class="mi">4034</span><span class="p">,),(</span><span class="mi">12001</span><span class="p">,),(</span><span class="mi">230</span><span class="p">,)]</span>
|
||||
<span class="n">cursor</span><span class="o">.</span><span class="n">executemany</span><span class="p">(</span><span class="n">sql</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span>
|
||||
|
||||
<span class="c1">#insert</span>
|
||||
<span class="n">sql</span><span class="o">=</span> <span class="s2">"INSERT INTO books (book_name, author_name, price) VALUES (?, ?, ?)"</span>
|
||||
<span class="n">data</span><span class="o">=</span> <span class="p">[(</span><span class="s2">"The Lord of the Rings"</span><span class="p">,</span> <span class="s2">"J.R.R. Tolkien"</span><span class="p">,</span> <span class="mf">18.99</span><span class="p">),</span>
|
||||
<span class="p">(</span><span class="s2">"Le Petit Prince"</span><span class="p">,</span> <span class="s2">"Antoine de Saint-Exupéry"</span><span class="p">,</span> <span class="mf">22.40</span><span class="p">),</span>
|
||||
<span class="p">(</span><span class="s2">"Dream of the Red Chamber"</span><span class="p">,</span> <span class="s2">"Cao Xueqin"</span><span class="p">,</span> <span class="mf">16.90</span><span class="p">),</span>
|
||||
<span class="p">(</span><span class="s2">"The Adventures of Pinocchio"</span><span class="p">,</span> <span class="s2">"Carlo Collodi"</span><span class="p">,</span> <span class="mf">17.10</span><span class="p">)]</span>
|
||||
<span class="n">cursor</span><span class="o">.</span><span class="n">executemany</span><span class="p">(</span><span class="n">sql</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span>
|
||||
</pre></div>
|
||||
</td></tr></table></div>
|
||||
<p>When using executemany(), there are a few restrictions:
|
||||
- All tuples must have the same types as in first tuple. E.g. the parameter [(1),(1.0)] or [(1),(None)] are invalid.
|
||||
- Special values like None or column default value needs to be indicated by an indicator.</p>
|
||||
<div class="section" id="using-indicators">
|
||||
<h3>Using indicators<a class="headerlink" href="#using-indicators" title="Permalink to this headline">¶</a></h3>
|
||||
<p>In certain situations, for example when inserting default values or NULL, special indicators must be used.</p>
|
||||
<div class="highlight-python notranslate"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1
|
||||
2
|
||||
3
|
||||
4
|
||||
5</pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="n">cursor</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s2">"CREATE TABLE cakes(id int, cake varchar(100), price decimal(10,2) default 1.99)"</span><span class="p">)</span>
|
||||
|
||||
<span class="n">sql</span><span class="o">=</span> <span class="s2">"INSERT INTO cakes (id, cake, price) VALUES (?,?)"</span>
|
||||
<span class="n">data</span><span class="o">=</span> <span class="p">[(</span><span class="mi">1</span><span class="p">,</span> <span class="s2">"Cherry Cake"</span><span class="p">,</span> <span class="mf">2.10</span><span class="p">),</span> <span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="s2">"Apple Cake"</span><span class="p">,</span> <span class="n">mariadb</span><span class="o">.</span><span class="n">indicator_default</span><span class="p">)]</span>
|
||||
<span class="n">cursor</span><span class="o">.</span><span class="n">executemany</span><span class="p">(</span><span class="n">sql</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span>
|
||||
</pre></div>
|
||||
</td></tr></table></div>
|
||||
<dl class="simple">
|
||||
<dt>Beside the default indicator which inserts the default value of 1.99, the following indicators are supported:</dt><dd><ul class="simple">
|
||||
<li><p>indicator_ignore: Ignores the value (only update commands)</p></li>
|
||||
<li><p>indicator_null: Value is NULL</p></li>
|
||||
<li><p>indicator_row: Don’t update or insert row</p></li>
|
||||
</ul>
|
||||
</dd>
|
||||
</dl>
|
||||
<div class="admonition note">
|
||||
<p class="admonition-title">Note</p>
|
||||
<ul class="simple">
|
||||
<li><p>Mixing different parameter styles is not supported and will raise an exception</p></li>
|
||||
<li><p>The Python string operator % must not be used. The <a class="reference internal" href="cursor.html#execute" title="execute"><code class="xref py py-func docutils literal notranslate"><span class="pre">execute()</span></code></a> method accepts a tuple or list as second parameter.</p></li>
|
||||
<li><p>Placeholders between quotation marks are interpreted as a string.</p></li>
|
||||
<li><p>Parameters for <a class="reference internal" href="cursor.html#execute" title="execute"><code class="xref py py-func docutils literal notranslate"><span class="pre">execute()</span></code></a> needs to be passed as a tuple. If only one parameter will be passed, tuple needs to contain a comma at the end.</p></li>
|
||||
<li><p>Parameters for <a class="reference internal" href="cursor.html#executemany" title="executemany"><code class="xref py py-func docutils literal notranslate"><span class="pre">executemany()</span></code></a> need to be passed as a list of tuples.</p></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section" id="supported-data-types">
|
||||
<h4>Supported Data types<a class="headerlink" href="#supported-data-types" title="Permalink to this headline">¶</a></h4>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
|
||||
</div>
|
||||
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|
||||
</div>
|
||||
<div class="sphinxsidebar" role="navigation" aria-label="main navigation">
|
||||
<div class="sphinxsidebarwrapper">
|
||||
<h3><a href="index.html">Table of Contents</a></h3>
|
||||
<ul>
|
||||
<li><a class="reference internal" href="#">Basic usage</a><ul>
|
||||
<li><a class="reference internal" href="#connecting">Connecting</a></li>
|
||||
<li><a class="reference internal" href="#passing-parameters-to-sql-statements">Passing parameters to SQL statements</a><ul>
|
||||
<li><a class="reference internal" href="#using-indicators">Using indicators</a><ul>
|
||||
<li><a class="reference internal" href="#supported-data-types">Supported Data types</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
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|
||||
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|
||||
|
||||
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|
||||
<p class="topless"><a href="install.html"
|
||||
title="previous chapter">Installation</a></p>
|
||||
<h4>Next topic</h4>
|
||||
<p class="topless"><a href="module.html"
|
||||
title="next chapter">The mariadb module</a></p>
|
||||
<div role="note" aria-label="source link">
|
||||
<h3>This Page</h3>
|
||||
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||||
<li><a href="_sources/usage.rst.txt"
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<form class="search" action="search.html" method="get">
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>index</a></li>
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