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1 from django.db.backends.oracle.base import DatabaseOperations |
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2 import re |
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3 import cx_Oracle |
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4 |
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5 quote_name = DatabaseOperations().quote_name |
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6 foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)") |
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7 |
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8 def get_table_list(cursor): |
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9 "Returns a list of table names in the current database." |
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10 cursor.execute("SELECT TABLE_NAME FROM USER_TABLES") |
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11 return [row[0].upper() for row in cursor.fetchall()] |
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12 |
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13 def get_table_description(cursor, table_name): |
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14 "Returns a description of the table, with the DB-API cursor.description interface." |
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15 cursor.execute("SELECT * FROM %s WHERE ROWNUM < 2" % quote_name(table_name)) |
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16 return cursor.description |
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17 |
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18 def _name_to_index(cursor, table_name): |
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19 """ |
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20 Returns a dictionary of {field_name: field_index} for the given table. |
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21 Indexes are 0-based. |
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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 |
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25 def get_relations(cursor, table_name): |
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26 """ |
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27 Returns a dictionary of {field_index: (field_index_other_table, other_table)} |
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28 representing all relationships to the given table. Indexes are 0-based. |
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29 """ |
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30 cursor.execute(""" |
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31 SELECT ta.column_id - 1, tb.table_name, tb.column_id - 1 |
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32 FROM user_constraints, USER_CONS_COLUMNS ca, USER_CONS_COLUMNS cb, |
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33 user_tab_cols ta, user_tab_cols tb |
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34 WHERE user_constraints.table_name = %s AND |
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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 |
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44 relations = {} |
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45 for row in cursor.fetchall(): |
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46 relations[row[0]] = (row[2], row[1]) |
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47 return relations |
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48 |
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49 def get_indexes(cursor, table_name): |
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50 """ |
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51 Returns a dictionary of fieldname -> infodict for the given table, |
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52 where each infodict is in the format: |
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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 |
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89 # Maps type objects to Django Field types. |
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90 DATA_TYPES_REVERSE = { |
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91 cx_Oracle.CLOB: 'TextField', |
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92 cx_Oracle.DATETIME: 'DateTimeField', |
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93 cx_Oracle.FIXED_CHAR: 'CharField', |
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94 cx_Oracle.NCLOB: 'TextField', |
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95 cx_Oracle.NUMBER: 'DecimalField', |
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96 cx_Oracle.STRING: 'CharField', |
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97 cx_Oracle.TIMESTAMP: 'DateTimeField', |
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98 } |