99 lines
4.0 KiB
Python
99 lines
4.0 KiB
Python
from django.db.backends.oracle.base import quote_name
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import re
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import cx_Oracle
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foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)")
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def get_table_list(cursor):
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"Returns a list of table names in the current database."
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cursor.execute("SELECT TABLE_NAME FROM USER_TABLES")
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return [row[0].upper() for row in cursor.fetchall()]
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def get_table_description(cursor, table_name):
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"Returns a description of the table, with the DB-API cursor.description interface."
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cursor.execute("SELECT * FROM %s WHERE ROWNUM < 2" % quote_name(table_name))
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return cursor.description
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def _name_to_index(cursor, table_name):
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"""
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Returns a dictionary of {field_name: field_index} for the given table.
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Indexes are 0-based.
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"""
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return dict([(d[0], i) for i, d in enumerate(get_table_description(cursor, table_name))])
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def get_relations(cursor, table_name):
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"""
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Returns a dictionary of {field_index: (field_index_other_table, other_table)}
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representing all relationships to the given table. Indexes are 0-based.
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"""
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cursor.execute("""
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SELECT ta.column_id - 1, tb.table_name, tb.column_id - 1
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FROM user_constraints, USER_CONS_COLUMNS ca, USER_CONS_COLUMNS cb,
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user_tab_cols ta, user_tab_cols tb
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WHERE user_constraints.table_name = %s AND
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ta.table_name = %s AND
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ta.column_name = ca.column_name AND
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ca.table_name = %s AND
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user_constraints.constraint_name = ca.constraint_name AND
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user_constraints.r_constraint_name = cb.constraint_name AND
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cb.table_name = tb.table_name AND
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cb.column_name = tb.column_name AND
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ca.position = cb.position""", [table_name, table_name, table_name])
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relations = {}
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for row in cursor.fetchall():
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relations[row[0]] = (row[2], row[1])
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return relations
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def get_indexes(cursor, table_name):
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"""
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Returns a dictionary of fieldname -> infodict for the given table,
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where each infodict is in the format:
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{'primary_key': boolean representing whether it's the primary key,
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'unique': boolean representing whether it's a unique index}
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"""
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# This query retrieves each index on the given table, including the
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# first associated field name
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# "We were in the nick of time; you were in great peril!"
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sql = """
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WITH primarycols AS (
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SELECT user_cons_columns.table_name, user_cons_columns.column_name, 1 AS PRIMARYCOL
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FROM user_cons_columns, user_constraints
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WHERE user_cons_columns.constraint_name = user_constraints.constraint_name AND
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user_constraints.constraint_type = 'P' AND
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user_cons_columns.table_name = %s),
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uniquecols AS (
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SELECT user_ind_columns.table_name, user_ind_columns.column_name, 1 AS UNIQUECOL
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FROM user_indexes, user_ind_columns
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WHERE uniqueness = 'UNIQUE' AND
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user_indexes.index_name = user_ind_columns.index_name AND
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user_ind_columns.table_name = %s)
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SELECT allcols.column_name, primarycols.primarycol, uniquecols.UNIQUECOL
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FROM (SELECT column_name FROM primarycols UNION SELECT column_name FROM
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uniquecols) allcols,
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primarycols, uniquecols
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WHERE allcols.column_name = primarycols.column_name (+) AND
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allcols.column_name = uniquecols.column_name (+)
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"""
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cursor.execute(sql, [table_name, table_name])
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indexes = {}
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for row in cursor.fetchall():
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# row[1] (idx.indkey) is stored in the DB as an array. It comes out as
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# a string of space-separated integers. This designates the field
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# indexes (1-based) of the fields that have indexes on the table.
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# Here, we skip any indexes across multiple fields.
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indexes[row[0]] = {'primary_key': row[1], 'unique': row[2]}
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return indexes
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# Maps type objects to Django Field types.
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DATA_TYPES_REVERSE = {
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cx_Oracle.CLOB: 'TextField',
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cx_Oracle.DATETIME: 'DateTimeField',
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cx_Oracle.FIXED_CHAR: 'CharField',
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cx_Oracle.NCLOB: 'TextField',
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cx_Oracle.NUMBER: 'DecimalField',
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cx_Oracle.STRING: 'CharField',
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cx_Oracle.TIMESTAMP: 'DateTimeField',
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}
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