schema-evolution:

backported on request to mysql_old (untested)

git-svn-id: http://code.djangoproject.com/svn/django/branches/schema-evolution@5791 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/mysql_old/base.py

@@ -258,6 +258,51 @@ def get_sql_sequence_reset(style, model_list):
     # No sequence reset required
     return []
 
+def get_change_table_name_sql( table_name, old_table_name ):
+    return ['ALTER TABLE '+ quote_name(old_table_name) +' RENAME TO '+ quote_name(table_name) + ';']
+
+def get_change_column_name_sql( table_name, indexes, old_col_name, new_col_name, col_def ):
+    # mysql doesn't support column renames (AFAIK), so we fake it
+    # TODO: only supports a single primary key so far
+    pk_name = None
+    for key in indexes.keys():
+        if indexes[key]['primary_key']: pk_name = key
+    output = []
+    output.append( 'ALTER TABLE '+ quote_name(table_name) +' CHANGE COLUMN '+ quote_name(old_col_name) +' '+ quote_name(new_col_name) +' '+ col_def + ';' )
+    return output
+
+def get_change_column_def_sql( table_name, col_name, col_type, null, unique, primary_key ):
+    output = []
+    col_def = col_type +' '+ ('%sNULL' % (not null and 'NOT ' or ''))
+    if unique:
+        col_def += ' '+ 'UNIQUE'
+    if primary_key:
+        col_def += ' '+ 'PRIMARY KEY'
+    output.append( 'ALTER TABLE '+ quote_name(table_name) +' MODIFY COLUMN '+ quote_name(col_name) +' '+ col_def + ';' )
+    return output
+
+def get_add_column_sql( table_name, col_name, col_type, null, unique, primary_key  ):
+    output = []
+    field_output = []
+    field_output.append('ALTER TABLE')
+    field_output.append(quote_name(table_name))
+    field_output.append('ADD COLUMN')
+    field_output.append(quote_name(col_name))
+    field_output.append(col_type)
+    field_output.append(('%sNULL' % (not null and 'NOT ' or '')))
+    if unique:
+        field_output.append(('UNIQUE'))
+    if primary_key:
+        field_output.append(('PRIMARY KEY'))
+    output.append(' '.join(field_output) + ';')
+    return output
+
+def get_drop_column_sql( table_name, col_name ):
+    output = []
+    output.append( 'ALTER TABLE '+ quote_name(table_name) +' DROP COLUMN '+ quote_name(col_name) + ';' )
+    return output
+    
+    
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': 'LIKE %s',

django/db/backends/mysql_old/introspection.py

@@ -73,6 +73,43 @@ def get_indexes(cursor, table_name):
         indexes[row[4]] = {'primary_key': (row[2] == 'PRIMARY'), 'unique': not bool(row[1])}
     return indexes
 
+def get_columns(cursor, table_name):
+    try:
+        cursor.execute("describe %s" % quote_name(table_name))
+        return [row[0] for row in cursor.fetchall()]
+    except:
+        return []
+    
+def get_known_column_flags( cursor, table_name, column_name ):
+    cursor.execute("describe %s" % quote_name(table_name))
+    dict = {}
+    for row in cursor.fetchall():
+        if row[0] == column_name:
+
+            # maxlength check goes here
+            if row[1][0:7]=='varchar':
+                dict['maxlength'] = row[1][8:len(row[1])-1]
+            
+            # default flag check goes here
+            if row[2]=='YES': dict['allow_null'] = True
+            else: dict['allow_null'] = False
+            
+            # primary/foreign/unique key flag check goes here
+            if row[3]=='PRI': dict['primary_key'] = True
+            else: dict['primary_key'] = False
+            if row[3]=='FOR': dict['foreign_key'] = True
+            else: dict['foreign_key'] = False
+            if row[3]=='UNI': dict['unique'] = True
+            else: dict['unique'] = False
+            
+            # default value check goes here
+            # if row[4]=='NULL': dict['default'] = None
+            # else: dict['default'] = row[4]
+            dict['default'] = row[4]
+            
+    # print table_name, column_name, dict
+    return dict
+    
 DATA_TYPES_REVERSE = {
     FIELD_TYPE.BLOB: 'TextField',
     FIELD_TYPE.CHAR: 'CharField',