1 from django.db.backends.oracle.base import DatabaseOperations |
1 from django.db.backends import BaseDatabaseIntrospection |
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2 import cx_Oracle |
2 import re |
3 import re |
3 import cx_Oracle |
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4 |
4 |
5 quote_name = DatabaseOperations().quote_name |
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6 foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)") |
5 foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)") |
7 |
6 |
8 def get_table_list(cursor): |
7 class DatabaseIntrospection(BaseDatabaseIntrospection): |
9 "Returns a list of table names in the current database." |
8 # Maps type objects to Django Field types. |
10 cursor.execute("SELECT TABLE_NAME FROM USER_TABLES") |
9 data_types_reverse = { |
11 return [row[0].upper() for row in cursor.fetchall()] |
10 cx_Oracle.CLOB: 'TextField', |
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11 cx_Oracle.DATETIME: 'DateTimeField', |
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12 cx_Oracle.FIXED_CHAR: 'CharField', |
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13 cx_Oracle.NCLOB: 'TextField', |
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14 cx_Oracle.NUMBER: 'DecimalField', |
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15 cx_Oracle.STRING: 'CharField', |
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16 cx_Oracle.TIMESTAMP: 'DateTimeField', |
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17 } |
12 |
18 |
13 def get_table_description(cursor, table_name): |
19 def get_table_list(self, cursor): |
14 "Returns a description of the table, with the DB-API cursor.description interface." |
20 "Returns a list of table names in the current database." |
15 cursor.execute("SELECT * FROM %s WHERE ROWNUM < 2" % quote_name(table_name)) |
21 cursor.execute("SELECT TABLE_NAME FROM USER_TABLES") |
16 return cursor.description |
22 return [row[0].upper() for row in cursor.fetchall()] |
17 |
23 |
18 def _name_to_index(cursor, table_name): |
24 def get_table_description(self, cursor, table_name): |
19 """ |
25 "Returns a description of the table, with the DB-API cursor.description interface." |
20 Returns a dictionary of {field_name: field_index} for the given table. |
26 cursor.execute("SELECT * FROM %s WHERE ROWNUM < 2" % self.connection.ops.quote_name(table_name)) |
21 Indexes are 0-based. |
27 return cursor.description |
22 """ |
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23 return dict([(d[0], i) for i, d in enumerate(get_table_description(cursor, table_name))]) |
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24 |
28 |
25 def get_relations(cursor, table_name): |
29 def table_name_converter(self, name): |
26 """ |
30 "Table name comparison is case insensitive under Oracle" |
27 Returns a dictionary of {field_index: (field_index_other_table, other_table)} |
31 return name.upper() |
28 representing all relationships to the given table. Indexes are 0-based. |
32 |
29 """ |
33 def _name_to_index(self, cursor, table_name): |
30 cursor.execute(""" |
34 """ |
31 SELECT ta.column_id - 1, tb.table_name, tb.column_id - 1 |
35 Returns a dictionary of {field_name: field_index} for the given table. |
32 FROM user_constraints, USER_CONS_COLUMNS ca, USER_CONS_COLUMNS cb, |
36 Indexes are 0-based. |
33 user_tab_cols ta, user_tab_cols tb |
37 """ |
34 WHERE user_constraints.table_name = %s AND |
38 return dict([(d[0], i) for i, d in enumerate(self.get_table_description(cursor, table_name))]) |
35 ta.table_name = %s AND |
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36 ta.column_name = ca.column_name AND |
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37 ca.table_name = %s AND |
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38 user_constraints.constraint_name = ca.constraint_name AND |
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39 user_constraints.r_constraint_name = cb.constraint_name AND |
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40 cb.table_name = tb.table_name AND |
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41 cb.column_name = tb.column_name AND |
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42 ca.position = cb.position""", [table_name, table_name, table_name]) |
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43 |
39 |
44 relations = {} |
40 def get_relations(self, cursor, table_name): |
45 for row in cursor.fetchall(): |
41 """ |
46 relations[row[0]] = (row[2], row[1]) |
42 Returns a dictionary of {field_index: (field_index_other_table, other_table)} |
47 return relations |
43 representing all relationships to the given table. Indexes are 0-based. |
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44 """ |
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45 cursor.execute(""" |
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46 SELECT ta.column_id - 1, tb.table_name, tb.column_id - 1 |
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47 FROM user_constraints, USER_CONS_COLUMNS ca, USER_CONS_COLUMNS cb, |
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48 user_tab_cols ta, user_tab_cols tb |
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49 WHERE user_constraints.table_name = %s AND |
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50 ta.table_name = %s AND |
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51 ta.column_name = ca.column_name AND |
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52 ca.table_name = %s AND |
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53 user_constraints.constraint_name = ca.constraint_name AND |
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54 user_constraints.r_constraint_name = cb.constraint_name AND |
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55 cb.table_name = tb.table_name AND |
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56 cb.column_name = tb.column_name AND |
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57 ca.position = cb.position""", [table_name, table_name, table_name]) |
48 |
58 |
49 def get_indexes(cursor, table_name): |
59 relations = {} |
50 """ |
60 for row in cursor.fetchall(): |
51 Returns a dictionary of fieldname -> infodict for the given table, |
61 relations[row[0]] = (row[2], row[1]) |
52 where each infodict is in the format: |
62 return relations |
53 {'primary_key': boolean representing whether it's the primary key, |
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54 'unique': boolean representing whether it's a unique index} |
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55 """ |
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56 # This query retrieves each index on the given table, including the |
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57 # first associated field name |
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58 # "We were in the nick of time; you were in great peril!" |
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59 sql = """ |
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60 WITH primarycols AS ( |
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61 SELECT user_cons_columns.table_name, user_cons_columns.column_name, 1 AS PRIMARYCOL |
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62 FROM user_cons_columns, user_constraints |
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63 WHERE user_cons_columns.constraint_name = user_constraints.constraint_name AND |
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64 user_constraints.constraint_type = 'P' AND |
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65 user_cons_columns.table_name = %s), |
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66 uniquecols AS ( |
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67 SELECT user_ind_columns.table_name, user_ind_columns.column_name, 1 AS UNIQUECOL |
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68 FROM user_indexes, user_ind_columns |
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69 WHERE uniqueness = 'UNIQUE' AND |
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70 user_indexes.index_name = user_ind_columns.index_name AND |
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71 user_ind_columns.table_name = %s) |
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72 SELECT allcols.column_name, primarycols.primarycol, uniquecols.UNIQUECOL |
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73 FROM (SELECT column_name FROM primarycols UNION SELECT column_name FROM |
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74 uniquecols) allcols, |
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75 primarycols, uniquecols |
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76 WHERE allcols.column_name = primarycols.column_name (+) AND |
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77 allcols.column_name = uniquecols.column_name (+) |
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78 """ |
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79 cursor.execute(sql, [table_name, table_name]) |
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80 indexes = {} |
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81 for row in cursor.fetchall(): |
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82 # row[1] (idx.indkey) is stored in the DB as an array. It comes out as |
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83 # a string of space-separated integers. This designates the field |
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84 # indexes (1-based) of the fields that have indexes on the table. |
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85 # Here, we skip any indexes across multiple fields. |
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86 indexes[row[0]] = {'primary_key': row[1], 'unique': row[2]} |
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87 return indexes |
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88 |
63 |
89 # Maps type objects to Django Field types. |
64 def get_indexes(self, cursor, table_name): |
90 DATA_TYPES_REVERSE = { |
65 """ |
91 cx_Oracle.CLOB: 'TextField', |
66 Returns a dictionary of fieldname -> infodict for the given table, |
92 cx_Oracle.DATETIME: 'DateTimeField', |
67 where each infodict is in the format: |
93 cx_Oracle.FIXED_CHAR: 'CharField', |
68 {'primary_key': boolean representing whether it's the primary key, |
94 cx_Oracle.NCLOB: 'TextField', |
69 'unique': boolean representing whether it's a unique index} |
95 cx_Oracle.NUMBER: 'DecimalField', |
70 """ |
96 cx_Oracle.STRING: 'CharField', |
71 # This query retrieves each index on the given table, including the |
97 cx_Oracle.TIMESTAMP: 'DateTimeField', |
72 # first associated field name |
98 } |
73 # "We were in the nick of time; you were in great peril!" |
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74 sql = """ |
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75 WITH primarycols AS ( |
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76 SELECT user_cons_columns.table_name, user_cons_columns.column_name, 1 AS PRIMARYCOL |
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77 FROM user_cons_columns, user_constraints |
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78 WHERE user_cons_columns.constraint_name = user_constraints.constraint_name AND |
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79 user_constraints.constraint_type = 'P' AND |
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80 user_cons_columns.table_name = %s), |
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81 uniquecols AS ( |
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82 SELECT user_ind_columns.table_name, user_ind_columns.column_name, 1 AS UNIQUECOL |
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83 FROM user_indexes, user_ind_columns |
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84 WHERE uniqueness = 'UNIQUE' AND |
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85 user_indexes.index_name = user_ind_columns.index_name AND |
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86 user_ind_columns.table_name = %s) |
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87 SELECT allcols.column_name, primarycols.primarycol, uniquecols.UNIQUECOL |
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88 FROM (SELECT column_name FROM primarycols UNION SELECT column_name FROM |
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89 uniquecols) allcols, |
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90 primarycols, uniquecols |
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91 WHERE allcols.column_name = primarycols.column_name (+) AND |
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92 allcols.column_name = uniquecols.column_name (+) |
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93 """ |
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94 cursor.execute(sql, [table_name, table_name]) |
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95 indexes = {} |
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96 for row in cursor.fetchall(): |
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97 # row[1] (idx.indkey) is stored in the DB as an array. It comes out as |
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98 # a string of space-separated integers. This designates the field |
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99 # indexes (1-based) of the fields that have indexes on the table. |
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100 # Here, we skip any indexes across multiple fields. |
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101 indexes[row[0]] = {'primary_key': row[1], 'unique': row[2]} |
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102 return indexes |
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103 |