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- DB_Model: workaround for CI_DB_driver->_list_columns (if there are two

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tables with the same name in two different schemas, it returns a list of
fields from the two tables)
- DB_Model: changed loadTree to use the new method _list_columns
- DB_Model: added the method getSchemaAndTable
- Updated Studiengang_model to specify the schema when using the
loadTree method
- Studiengang_model: removed the titel parameter from method getAppliedStudiengang
- Studiengang2 controller removed the titel parameter from method getAppliedStudiengang
This commit is contained in:
Paolo
2017-04-04 18:27:31 +02:00
parent fb059e98bb
commit 4984b69366
3 changed files with 82 additions and 33 deletions
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application/core/DB_Model.php
+59 -2
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@@ -8,6 +8,7 @@ class DB_Model extends FHC_Model
const PGSQL_BOOLEAN_TRUE = 't';
const PGSQL_BOOLEAN_FALSE = 'f';
const MODEL_POSTFIX = '_model';
const DEFAULT_SCHEMA = 'public';
protected $dbTable; // Name of the DB-Table for CI-Insert, -Update, ...
protected $pk; // Name of the PrimaryKey for DB-Update, Load, ...
@@ -226,6 +227,8 @@ class DB_Model extends FHC_Model
* - Adding support for composed primary key
* - Adding support for cascading side tables (useful?)
*
* NOTE: sub queries are not supported in the from clause
*
* @return array
*/
public function loadTree($mainTable, $sideTables, $where = null, $sideTablesAliases = null)
@@ -246,13 +249,26 @@ class DB_Model extends FHC_Model
$select = '';
for ($t = 0; $t < count($tables); $t++)
{
$fields = $this->db->list_fields($tables[$t]); // list of the columns of the current table
// Get the schema if it is specified
$schemaAndTable = $this->getSchemaAndTable($tables[$t]);
// Discard the schema, not needed in the next steps
$tables[$t] = $schemaAndTable->table;
// List of the columns of the current table
// NOTE: $this->db->list_fields($tables[$t]) doesn't work if there are two tables with
// the same name in two different schemas, use this workaround
$fields = array();
if (isSuccess($lstColumns = $this->_list_columns($schemaAndTable->schema, $schemaAndTable->table)))
{
$fields = $lstColumns->retval;
}
for ($f = 0; $f < count($fields); $f++)
{
// To avoid overwriting of the properties within the object returned by CI
// will be given an alias to every column, that will be composed with the following schema
// <table name>.<column name> AS <table_name>_<column name>
$select .= $tables[$t] . '.' . $fields[$f] . ' AS ' . $tables[$t] . '_' . $fields[$f];
$select .= $tables[$t] . '.' . $fields[$f]->column_name . ' AS ' . $tables[$t] . '_' . $fields[$f]->column_name;
if ($f < count($fields) - 1) $select .= ', ';
}
@@ -640,6 +656,32 @@ class DB_Model extends FHC_Model
return $result;
}
/**
* Get schema and table name from the parameter
* If no schema are specified it will returns the parameter as table name,
* and the default schema as schema
* Ex:
* If the parameters is 'lehre.tbl_studienplan' it will returns the following object:
* obj
* |--->schema: lehre
* |--->table: tbl_studienplan
*/
protected function getSchemaAndTable($schemaAndTable)
{
$result = new stdClass();
$result->schema = DB_Model::DEFAULT_SCHEMA;
$result->table = $schemaAndTable;
// If a schema is specified
if (($pos = strpos($schemaAndTable, '.')) !== false)
{
$result->schema = substr($schemaAndTable, 0, $pos);
$result->table = substr($schemaAndTable, $pos + 1);
}
return $result;
}
/**
* Checks if the caller is entitled to perform this operation with this right
*/
@@ -755,4 +797,19 @@ class DB_Model extends FHC_Model
return false;
}
/**
* Workaround of CI_DB_driver->_list_columns
* CI_DB_driver->list_fields($tableName), that calls CI_DB_postgre_driver->_list_columns,
* doesn't work if there are two tables with the same name in two different schemas
*/
private function _list_columns($schema, $table)
{
$query = 'SELECT column_name
FROM information_schema.columns
WHERE LOWER(table_schema) = ?
AND LOWER(table_name) = ?';
return $this->execQuery($query, array(strtolower($schema), strtolower($table)));
}
}