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annotate rhodecode/lib/dbmigrate/migrate/changeset/databases/sqlite.py @ 833:9753e0907827 beta

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added dbmigrate package, added model changes moved out upgrade db command to that package
author Marcin Kuzminski <marcin@python-works.com>
date Sat, 11 Dec 2010 01:54:12 +0100
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children 08d2dcd71666
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rev   line source
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1 """
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2 `SQLite`_ database specific implementations of changeset classes.
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3
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4 .. _`SQLite`: http://www.sqlite.org/
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5 """
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6 from UserDict import DictMixin
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7 from copy import copy
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8
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9 from sqlalchemy.databases import sqlite as sa_base
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10
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11 from migrate import exceptions
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12 from migrate.changeset import ansisql, SQLA_06
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13
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14
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15 if not SQLA_06:
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16 SQLiteSchemaGenerator = sa_base.SQLiteSchemaGenerator
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17 else:
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18 SQLiteSchemaGenerator = sa_base.SQLiteDDLCompiler
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19
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20 class SQLiteCommon(object):
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21
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22 def _not_supported(self, op):
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23 raise exceptions.NotSupportedError("SQLite does not support "
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24 "%s; see http://www.sqlite.org/lang_altertable.html" % op)
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25
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26
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27 class SQLiteHelper(SQLiteCommon):
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28
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29 def recreate_table(self,table,column=None,delta=None):
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30 table_name = self.preparer.format_table(table)
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31
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32 # we remove all indexes so as not to have
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33 # problems during copy and re-create
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34 for index in table.indexes:
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35 index.drop()
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36
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37 self.append('ALTER TABLE %s RENAME TO migration_tmp' % table_name)
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38 self.execute()
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39
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40 insertion_string = self._modify_table(table, column, delta)
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41
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42 table.create()
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43 self.append(insertion_string % {'table_name': table_name})
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44 self.execute()
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45 self.append('DROP TABLE migration_tmp')
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46 self.execute()
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47
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48 def visit_column(self, delta):
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49 if isinstance(delta, DictMixin):
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50 column = delta.result_column
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51 table = self._to_table(delta.table)
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52 else:
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53 column = delta
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54 table = self._to_table(column.table)
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55 self.recreate_table(table,column,delta)
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56
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57 class SQLiteColumnGenerator(SQLiteSchemaGenerator,
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58 ansisql.ANSIColumnGenerator,
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59 # at the end so we get the normal
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60 # visit_column by default
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61 SQLiteHelper,
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62 SQLiteCommon
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63 ):
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64 """SQLite ColumnGenerator"""
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65
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66 def _modify_table(self, table, column, delta):
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67 columns = ' ,'.join(map(
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68 self.preparer.format_column,
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69 [c for c in table.columns if c.name!=column.name]))
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70 return ('INSERT INTO %%(table_name)s (%(cols)s) '
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71 'SELECT %(cols)s from migration_tmp')%{'cols':columns}
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72
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73 def visit_column(self,column):
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74 if column.foreign_keys:
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75 SQLiteHelper.visit_column(self,column)
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76 else:
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77 super(SQLiteColumnGenerator,self).visit_column(column)
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78
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79 class SQLiteColumnDropper(SQLiteHelper, ansisql.ANSIColumnDropper):
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80 """SQLite ColumnDropper"""
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81
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82 def _modify_table(self, table, column, delta):
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83 columns = ' ,'.join(map(self.preparer.format_column, table.columns))
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84 return 'INSERT INTO %(table_name)s SELECT ' + columns + \
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85 ' from migration_tmp'
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86
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87
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88 class SQLiteSchemaChanger(SQLiteHelper, ansisql.ANSISchemaChanger):
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89 """SQLite SchemaChanger"""
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90
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91 def _modify_table(self, table, column, delta):
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92 return 'INSERT INTO %(table_name)s SELECT * from migration_tmp'
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93
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94 def visit_index(self, index):
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95 """Does not support ALTER INDEX"""
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96 self._not_supported('ALTER INDEX')
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97
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98
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99 class SQLiteConstraintGenerator(ansisql.ANSIConstraintGenerator, SQLiteHelper, SQLiteCommon):
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100
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101 def visit_migrate_primary_key_constraint(self, constraint):
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102 tmpl = "CREATE UNIQUE INDEX %s ON %s ( %s )"
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103 cols = ', '.join(map(self.preparer.format_column, constraint.columns))
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104 tname = self.preparer.format_table(constraint.table)
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105 name = self.get_constraint_name(constraint)
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106 msg = tmpl % (name, tname, cols)
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107 self.append(msg)
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108 self.execute()
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109
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110 def _modify_table(self, table, column, delta):
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111 return 'INSERT INTO %(table_name)s SELECT * from migration_tmp'
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112
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113 def visit_migrate_foreign_key_constraint(self, *p, **k):
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114 self.recreate_table(p[0].table)
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115
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116 def visit_migrate_unique_constraint(self, *p, **k):
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117 self.recreate_table(p[0].table)
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118
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119
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120 class SQLiteConstraintDropper(ansisql.ANSIColumnDropper,
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121 SQLiteCommon,
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122 ansisql.ANSIConstraintCommon):
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123
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124 def visit_migrate_primary_key_constraint(self, constraint):
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125 tmpl = "DROP INDEX %s "
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126 name = self.get_constraint_name(constraint)
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127 msg = tmpl % (name)
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128 self.append(msg)
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129 self.execute()
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130
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131 def visit_migrate_foreign_key_constraint(self, *p, **k):
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132 self._not_supported('ALTER TABLE DROP CONSTRAINT')
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133
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134 def visit_migrate_check_constraint(self, *p, **k):
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135 self._not_supported('ALTER TABLE DROP CONSTRAINT')
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136
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137 def visit_migrate_unique_constraint(self, *p, **k):
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138 self._not_supported('ALTER TABLE DROP CONSTRAINT')
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139
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140
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141 # TODO: technically primary key is a NOT NULL + UNIQUE constraint, should add NOT NULL to index
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142
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Marcin Kuzminski <marcin@python-works.com>
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143 class SQLiteDialect(ansisql.ANSIDialect):
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144 columngenerator = SQLiteColumnGenerator
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145 columndropper = SQLiteColumnDropper
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Marcin Kuzminski <marcin@python-works.com>
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146 schemachanger = SQLiteSchemaChanger
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147 constraintgenerator = SQLiteConstraintGenerator
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148 constraintdropper = SQLiteConstraintDropper