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<?xml version="1.0" encoding="ascii"?>
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<span class="breadcrumbs">
<a href="Gnumed-module.html">Package Gnumed</a> ::
<a href="Gnumed.pycommon-module.html">Package pycommon</a> ::
Module gmPG
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<!-- ==================== MODULE DESCRIPTION ==================== -->
<h1 class="epydoc">Module gmPG</h1><p class="nomargin-top"><span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html">source code</a></span></p>
<hr />
<div class="fields"> <p><strong>Version:</strong>
$Revision: 1.90 $
</p>
<p><strong>Author:</strong>
H.Herb <hherb@gnumed.net>, I.Haywood
<i.haywood@ugrad.unimelb.edu.au>, K.Hilbert
<Karsten.Hilbert@gmx.net>
</p>
<p><strong>License:</strong>
GPL v2 or later (details at http://www.gnu.org)
</p>
</div><!-- ==================== CLASSES ==================== -->
<a name="section-Classes"></a>
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<span class="table-header">Classes</span></td>
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<span class="summary-type"> </span>
</td><td class="summary">
<a href="Gnumed.pycommon.gmPG.ConnectionPool-class.html" class="summary-name">ConnectionPool</a><br />
maintains a static dictionary of available database connections
</td>
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</table>
<!-- ==================== FUNCTIONS ==================== -->
<a name="section-Functions"></a>
<table class="summary" border="1" cellpadding="3"
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<td align="left" colspan="2" class="table-header">
<span class="table-header">Functions</span></td>
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<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="fieldNames"></a><span class="summary-sig-name">fieldNames</span>(<span class="summary-sig-arg">cursor</span>)</span><br />
returns the attribute names of the fetched rows in natural sequence
as a list</td>
<td align="right" valign="top">
<span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#fieldNames">source code</a></span>
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<span class="summary-type"> </span>
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<table width="100%" cellpadding="0" cellspacing="0" border="0">
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<td><span class="summary-sig"><a name="run_query"></a><span class="summary-sig-name">run_query</span>(<span class="summary-sig-arg">aCursor</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">verbosity</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">aQuery</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">*args</span>)</span></td>
<td align="right" valign="top">
<span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#run_query">source code</a></span>
</td>
</tr>
</table>
</td>
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<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a href="Gnumed.pycommon.gmPG-module.html#run_commit2" class="summary-sig-name">run_commit2</a>(<span class="summary-sig-arg">link_obj</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">queries</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">end_tx</span>=<span class="summary-sig-default">False</span>,
<span class="summary-sig-arg">max_tries</span>=<span class="summary-sig-default">1</span>,
<span class="summary-sig-arg">extra_verbose</span>=<span class="summary-sig-default">False</span>,
<span class="summary-sig-arg">get_col_idx</span>=<span class="summary-sig-default">False</span>)</span><br />
Convenience function for running a transaction
that is supposed to get committed.</td>
<td align="right" valign="top">
<span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#run_commit2">source code</a></span>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a href="Gnumed.pycommon.gmPG-module.html#run_commit" class="summary-sig-name">run_commit</a>(<span class="summary-sig-arg">link_obj</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">queries</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">return_err_msg</span>=<span class="summary-sig-default">None</span>)</span><br />
Convenience function for running a transaction
that is supposed to get committed.</td>
<td align="right" valign="top">
<span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#run_commit">source code</a></span>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a href="Gnumed.pycommon.gmPG-module.html#run_ro_query" class="summary-sig-name">run_ro_query</a>(<span class="summary-sig-arg">link_obj</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">aQuery</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">get_col_idx</span>=<span class="summary-sig-default">False</span>,
<span class="summary-sig-arg">*args</span>)</span><br />
Runs a read-only query.</td>
<td align="right" valign="top">
<span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#run_ro_query">source code</a></span>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="get_col_indices"></a><span class="summary-sig-name">get_col_indices</span>(<span class="summary-sig-arg">aCursor</span>=<span class="summary-sig-default">None</span>)</span></td>
<td align="right" valign="top">
<span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#get_col_indices">source code</a></span>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="get_pkey_name"></a><span class="summary-sig-name">get_pkey_name</span>(<span class="summary-sig-arg">aCursor</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">aTable</span>=<span class="summary-sig-default">None</span>)</span></td>
<td align="right" valign="top">
<span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#get_pkey_name">source code</a></span>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a href="Gnumed.pycommon.gmPG-module.html#get_fkey_defs" class="summary-sig-name">get_fkey_defs</a>(<span class="summary-sig-arg">source</span>,
<span class="summary-sig-arg">table</span>)</span><br />
Returns a dictionary of referenced foreign keys.</td>
<td align="right" valign="top">
<span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#get_fkey_defs">source code</a></span>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="add_housekeeping_todo"></a><span class="summary-sig-name">add_housekeeping_todo</span>(<span class="summary-sig-arg">reporter</span>=<span class="summary-sig-default">'$RCSfile: gmPG.py,v $ $Revision: 1.90 $'</span>,
<span class="summary-sig-arg">receiver</span>=<span class="summary-sig-default">'DEFAULT'</span>,
<span class="summary-sig-arg">problem</span>=<span class="summary-sig-default">'lazy programmer'</span>,
<span class="summary-sig-arg">solution</span>=<span class="summary-sig-default">'lazy programmer'</span>,
<span class="summary-sig-arg">context</span>=<span class="summary-sig-default">'lazy programmer'</span>,
<span class="summary-sig-arg">category</span>=<span class="summary-sig-default">'lazy programmer'</span>)</span></td>
<td align="right" valign="top">
<span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#add_housekeeping_todo">source code</a></span>
</td>
</tr>
</table>
</td>
</tr>
</table>
<!-- ==================== VARIABLES ==================== -->
<a name="section-Variables"></a>
<table class="summary" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
<td align="left" colspan="2" class="table-header">
<span class="table-header">Variables</span></td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a name="tz"></a><span class="summary-name">tz</span> = <code title="time.timezone">time.timezone</code>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a href="Gnumed.pycommon.gmPG-module.html#QTablePrimaryKeyIndex" class="summary-name">QTablePrimaryKeyIndex</a> = <code title=""""
SELECT
indkey
FROM
pg_index
WHERE
indrelid =
(SELECT oid FROM pg_class WHERE relname = '%s');
..."><code class="variable-ellipsis">...</code></code>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a href="Gnumed.pycommon.gmPG-module.html#query_pkey_name" class="summary-name">query_pkey_name</a> = <code title=""""
SELECT
pga.attname
FROM
(pg_attribute pga inner join pg_index pgi on (pga.attrelid=pgi.indrel\
id))
WHERE
pga.attnum=pgi.indkey[0]
..."><code class="variable-ellipsis">...</code></code>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a href="Gnumed.pycommon.gmPG-module.html#query_fkey_names" class="summary-name">query_fkey_names</a> = <code title=""""
select tgargs from pg_trigger where
tgname like 'RI%%'
and
tgrelid = (
select oid from pg_class where relname=%s
)
""""><code class="variable-ellipsis">...</code></code>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a href="Gnumed.pycommon.gmPG-module.html#query_table_col_defs" class="summary-name">query_table_col_defs</a> = <code title=""""select
cols.column_name,
cols.udt_name
from
information_schema.columns cols
where
cols.table_schema = %s
and
...">"""sel<code class="variable-ellipsis">...</code></code>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a href="Gnumed.pycommon.gmPG-module.html#query_table_attributes" class="summary-name">query_table_attributes</a> = <code title=""""select
cols.column_name
from
information_schema.columns cols
where
cols.table_schema = %s
and
cols.table_name = %s
...">"""sel<code class="variable-ellipsis">...</code></code>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a href="Gnumed.pycommon.gmPG-module.html#query_child_tables" class="summary-name">query_child_tables</a> = <code title=""""
select
pgn.nspname as namespace,
pgc.relname as table
from
pg_namespace pgn,
pg_class pgc
where
..."><code class="variable-ellipsis">...</code></code>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a name="last_ro_cursor_desc"></a><span class="summary-name">last_ro_cursor_desc</span> = <code title="None">None</code>
</td>
</tr>
</table>
<p class="indent-wrapped-lines"><b>Imports:</b>
<span title="sys">sys</span>
</p><br />
<!-- ==================== FUNCTION DETAILS ==================== -->
<a name="section-FunctionDetails"></a>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
<td align="left" colspan="2" class="table-header">
<span class="table-header">Function Details</span></td>
</tr>
</table>
<a name="run_commit2"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">run_commit2</span>(<span class="sig-arg">link_obj</span>=<span class="sig-default">None</span>,
<span class="sig-arg">queries</span>=<span class="sig-default">None</span>,
<span class="sig-arg">end_tx</span>=<span class="sig-default">False</span>,
<span class="sig-arg">max_tries</span>=<span class="sig-default">1</span>,
<span class="sig-arg">extra_verbose</span>=<span class="sig-default">False</span>,
<span class="sig-arg">get_col_idx</span>=<span class="sig-default">False</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#run_commit2">source code</a></span>
</td>
</tr></table>
<pre class="literalblock">
Convenience function for running a transaction
that is supposed to get committed.
<link_obj>
can be either:
- a cursor
- a connection
- a service name
<queries>
is a list of (query, [args]) tuples to be
executed as a single transaction, the last
query may usefully return rows (such as a
"select currval('some_sequence')" statement)
<end_tx>
- controls whether the transaction is finalized (eg.
committed/rolled back) or not, this allows the
call to run_commit2() to be part of a framing
transaction
- if <link_obj> is a service name the transaction is
always finalized regardless of what <end_tx> says
- if link_obj is a connection then <end_tx> will
default to False unless it is explicitly set to
True which is taken to mean "yes, you do have full
control over the transaction" in which case the
transaction is properly finalized
<max_tries>
- controls the number of times a transaction is retried
after a concurrency error
- note that *all* <queries> are rerun if a concurrency
error occurrs
- max_tries is honored if and only if link_obj is a service
name such that we have full control over the transaction
<get_col_idx>
- if true, the returned data will include a dictionary
mapping field names to column positions
- if false, the returned data returns an empty dict
method result:
- returns a tuple (status, data)
- <status>:
* True - if all queries succeeded (also if there were 0 queries)
* False - if *any* error occurred
- <data> if <status> is True:
* (None, {}) if last query did not return rows
* ("fetchall() result", <index>) if last query returned any rows
* for <index> see <get_col_idx>
- <data> if <status> is False:
* a tuple (error, message) where <error> can be:
* 1: unspecified error
* 2: concurrency error
* 3: constraint violation (non-primary key)
* 4: access violation
</pre>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="run_commit"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">run_commit</span>(<span class="sig-arg">link_obj</span>=<span class="sig-default">None</span>,
<span class="sig-arg">queries</span>=<span class="sig-default">None</span>,
<span class="sig-arg">return_err_msg</span>=<span class="sig-default">None</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#run_commit">source code</a></span>
</td>
</tr></table>
<pre class="literalblock">
Convenience function for running a transaction
that is supposed to get committed.
- link_obj can be
- a cursor: rollback/commit must be done by the caller
- a connection: rollback/commit is handled
- a service name: rollback/commit is handled
- queries is a list of (query, [args]) tuples
- executed as a single transaction
- returns:
- a tuple (<value>, error) if return_err_msg is True
- a scalar <value> if return_err_msg is False
- <value> will be
- None: if any query failed
- 1: if all queries succeeded (also 0 queries)
- data: if the last query returned rows
</pre>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="run_ro_query"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">run_ro_query</span>(<span class="sig-arg">link_obj</span>=<span class="sig-default">None</span>,
<span class="sig-arg">aQuery</span>=<span class="sig-default">None</span>,
<span class="sig-arg">get_col_idx</span>=<span class="sig-default">False</span>,
<span class="sig-arg">*args</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#run_ro_query">source code</a></span>
</td>
</tr></table>
<pre class="literalblock">
Runs a read-only query.
- link_obj can be a service name, connection or cursor object
- return status:
- return data if get_col_idx is False
- return (data, idx) if get_col_idx is True
- if query fails: data is None
- if query is not a row-returning SQL statement: data is None
- data is a list of tuples [(w,x,y,z), (a,b,c,d), ...] where each tuple is a table row
- idx is a map of column name to their position in the row tuples
e.g. { 'name': 3, 'id':0, 'job_description': 2, 'location':1 }
usage: e.g. data[0][idx['name']] would return z from [(w,x,y,z ),(a,b,c,d)]
</pre>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="get_fkey_defs"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">get_fkey_defs</span>(<span class="sig-arg">source</span>,
<span class="sig-arg">table</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="Gnumed.pycommon.gmPG-pysrc.html#get_fkey_defs">source code</a></span>
</td>
</tr></table>
<p>Returns a dictionary of referenced foreign keys.</p>
<p>key = column name of this table value = (referenced table name,
referenced column name) tuple</p>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<br />
<!-- ==================== VARIABLES DETAILS ==================== -->
<a name="section-VariablesDetails"></a>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
<td align="left" colspan="2" class="table-header">
<span class="table-header">Variables Details</span></td>
</tr>
</table>
<a name="QTablePrimaryKeyIndex"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<h3 class="epydoc">QTablePrimaryKeyIndex</h3>
<dl class="fields">
</dl>
<dl class="fields">
<dt>Value:</dt>
<dd><table><tr><td><pre class="variable">
"""
SELECT
indkey
FROM
pg_index
WHERE
indrelid =
(SELECT oid FROM pg_class WHERE relname = '%s');
<code class="variable-ellipsis">...</code>
</pre></td></tr></table>
</dd>
</dl>
</td></tr></table>
</div>
<a name="query_pkey_name"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<h3 class="epydoc">query_pkey_name</h3>
<dl class="fields">
</dl>
<dl class="fields">
<dt>Value:</dt>
<dd><table><tr><td><pre class="variable">
"""
SELECT
pga.attname
FROM
(pg_attribute pga inner join pg_index pgi on (pga.attrelid=pgi.indrel<span class="variable-linewrap"><img src="crarr.png" alt="\" /></span>
id))
WHERE
pga.attnum=pgi.indkey[0]
<code class="variable-ellipsis">...</code>
</pre></td></tr></table>
</dd>
</dl>
</td></tr></table>
</div>
<a name="query_fkey_names"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<h3 class="epydoc">query_fkey_names</h3>
<dl class="fields">
</dl>
<dl class="fields">
<dt>Value:</dt>
<dd><table><tr><td><pre class="variable">
"""
select tgargs from pg_trigger where
tgname like 'RI%%'
and
tgrelid = (
select oid from pg_class where relname=%s
)
"""
</pre></td></tr></table>
</dd>
</dl>
</td></tr></table>
</div>
<a name="query_table_col_defs"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<h3 class="epydoc">query_table_col_defs</h3>
<dl class="fields">
</dl>
<dl class="fields">
<dt>Value:</dt>
<dd><table><tr><td><pre class="variable">
"""select
cols.column_name,
cols.udt_name
from
information_schema.columns cols
where
cols.table_schema = %s
and
<code class="variable-ellipsis">...</code>
</pre></td></tr></table>
</dd>
</dl>
</td></tr></table>
</div>
<a name="query_table_attributes"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<h3 class="epydoc">query_table_attributes</h3>
<dl class="fields">
</dl>
<dl class="fields">
<dt>Value:</dt>
<dd><table><tr><td><pre class="variable">
"""select
cols.column_name
from
information_schema.columns cols
where
cols.table_schema = %s
and
cols.table_name = %s
<code class="variable-ellipsis">...</code>
</pre></td></tr></table>
</dd>
</dl>
</td></tr></table>
</div>
<a name="query_child_tables"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<h3 class="epydoc">query_child_tables</h3>
<dl class="fields">
</dl>
<dl class="fields">
<dt>Value:</dt>
<dd><table><tr><td><pre class="variable">
"""
select
pgn.nspname as namespace,
pgc.relname as table
from
pg_namespace pgn,
pg_class pgc
where
<code class="variable-ellipsis">...</code>
</pre></td></tr></table>
</dd>
</dl>
</td></tr></table>
</div>
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