db export to make files smaller

image_list.py

@@ -33,6 +33,8 @@ def setup_options():
                       help="Depth of summarization for --du.")
     parser.add_argument("--exportDesc",action="store",dest="export_descriptions",default=None,
                       help="Walk through folders, and write "+DESCFILE+" in each folder. Format descriptions with {desc} {width}x{height} {red} {green} {blue} {Bred} {Bgreen} {Bblue} {size} {date} {name} {tags}")
+    parser.add_argument("--export",action="store",dest="exportfile",default=None,
+                      help="Export database to new sqlite database.")
     parser.add_argument("-f",action="store",dest="sqlfile",default=SQLFILE,
                       help="SQL file name to use [%(default)s]")
     parser.add_argument("-i",action="store",dest="importfile",default=None,
@@ -85,7 +87,8 @@ def setup_options():
        options.diskused:
         options.add=not options.add
     if options.tag or\
-       options.importfile:
+       options.importfile or\
+       options.exportfile:
         options.add=False
     return options
 
@@ -98,8 +101,8 @@ def createdb(sqlfile):
                width INTEGER,height INTEGER,\
                fingerprint TEXT,sharpness NUMERIC,\
                R REAL,G REAL, B REAL, BR REAL, BG REAL, BB REAL)')
-    db.execute('CREATE TABLE list (file TEXT,hash TEXT,date INTEGER,size INTEGER)')
-    db.execute('CREATE TABLE tags (tag TEXT,hash TEXT)')
+    db.execute('CREATE TABLE list (file TEXT PRIMARY KEY,hash TEXT,date INTEGER,size INTEGER)')
+    db.execute('CREATE TABLE tags (hash TEXT PRIMARY KEY,tag TEXT)')
     conn.commit() 
     return
 
@@ -957,6 +960,25 @@ def import_metadata(options):
     
     print("Imported %d metadata, %d tags." % (count,tagsafter-tagsbefore))
 
+def export_database(options):
+    """ export data to new sqlite file. Minimize file size of sqlite."""
+    if not os.path.exists(options.exportfile):
+        createdb(options.exportfile)
+    
+    conn=sqlite3.connect(options.sqlfile)
+    conn.text_factory=str
+    db=conn.cursor()
+    db.execute("ATTACH ? as toDB", (options.exportfile, ))
+    db.execute("INSERT OR REPLACE INTO toDB.list SELECT * FROM main.list")
+    db.execute("INSERT OR REPLACE INTO toDB.data SELECT * FROM main.data")
+    db.execute("INSERT OR IGNORE INTO toDB.tags SELECT * FROM main.tags")
+    conn.commit()
+    count=db.execute("SELECT COUNT(hash) FROM toDB.list").fetchall()[0][0]
+    metacount=db.execute("SELECT COUNT(hash) FROM toDB.data").fetchall()[0][0]
+    tagscount=db.execute("SELECT COUNT(hash) FROM toDB.tags").fetchall()[0][0]
+    
+    print("Exported %d files, %d metadata, %d tags." % (count,metacount,tagscount))
+
 def check_path(path,opt):
     """ return relative path name to DB if real path doesnt exist """
     if os.path.isfile(path):
@@ -1036,6 +1058,9 @@ def main():
     if options.importfile:
         print("Importing metadata")
         import_metadata(options)
+    if options.exportfile:
+        print("Exporting database")
+        export_database(options)
     if options.import_descriptions:
         print("Import descriptions")
         import_descriptions(options)