從Jython讀取sqlite數據庫

Question

我試圖運行jython sqlite示例發佈here。

################################################################################ 
# 
# sqlite_using_ziclix - An example of using the Python DB-API 2.0 compliant 
#      ziclix implementation to interact with a SQLite database. 
#      Creates a 'planet' table in a SQLite database 
#      named 'solarsys.db', populates it with some data and 
#      then executes a query to retrieve data from that table. 
# 
# Works with Jython 2.5, must have the zentus sqlitejdbc.jar in your 
# CLASSPATH at execution time. 
# Known to work with sqlitejdbc-v056.jar 
# 
################################################################################ 

import sys 

from com.ziclix.python.sql import zxJDBC 

################################################################################ 

DATABASE = "solarsys.db" 
JDBC_URL = "jdbc:sqlite:%s" % DATABASE 
JDBC_DRIVER = "org.sqlite.JDBC" 

TABLE_NAME  = "planet" 
TABLE_DROPPER = "drop table if exists %s;"      % TABLE_NAME 
TABLE_CREATOR = "create table %s (name, size, solar_distance);" % TABLE_NAME 
RECORD_INSERTER = "insert into %s values (?, ?, ?);"    % TABLE_NAME 
PLANET_QUERY = """ 
select name, size, solar_distance 
from %s 
order by size, solar_distance desc 
""" % TABLE_NAME 

PLANET_DATA = [('mercury' , 'small' , 57), # distance in million kilometers 
       ('venus' , 'small' , 107), 
       ('earth' , 'small' , 150), 
       ('mars' , 'small' , 229), 
       ('jupiter' , 'large' , 777), 
       ('saturn' , 'large' , 888), 
       ('uranus' , 'medium', 2871), 
       ('neptune' , 'medium', 4496), 
       ('pluto' , 'tiny' , 5869), 
       ] 

################################################################################ 

def main(): 
    dbConn = getConnection(JDBC_URL, JDBC_DRIVER) 
    cursor = dbConn.cursor() 
    try: 
     cursor.execute(TABLE_DROPPER) 
     cursor.execute(TABLE_CREATOR) 
    except zxJDBC.DatabaseError, msg: 
     print msg 
     sys.exit(1) 

    try: 
     cursor.executemany(RECORD_INSERTER, PLANET_DATA) 
     dbConn.commit() 
    except zxJDBC.DatabaseError, msg: 
     print msg 
     sys.exit(2) 

    try: 
     cursor.execute(PLANET_QUERY) 
     for row in cursor.fetchall(): 
      name, size, dist = row[:] 
      print "%-16.16s %-8.8s %4d" % (name, size, dist) 
    except zxJDBC.DatabaseError, msg: 
     print msg 
     sys.exit(3) 

    cursor.close() 
    dbConn.close() 
    sys.exit(0) 

################################################################################ 

def getConnection(jdbc_url, driverName): 
    """ 
     Given the name of a JDBC driver class and the url to be used 
     to connect to a database, attempt to obtain a connection to 
     the database. 
    """ 

    try: 
     # no user/password combo needed here, hence the None, None 
     dbConn = zxJDBC.connect(jdbc_url, None, None, driverName) 
    except zxJDBC.DatabaseError, msg: 
     print msg 
     sys.exit(-1) 

    return dbConn 

################################################################################ 
################################################################################ 

if __name__ == '__main__': 
    main() 

這需要org.sqlite.JDBC是avaialable，所以我下載jar文件，並把它放在當前目錄。然後我試圖與

jython -Dpython.path=.:sqlitejdbc-v056.jar ./db.py 

運行的例子，但我得到一個類未找到錯誤：

java.lang.ClassNotFoundException: java.lang.ClassNotFoundException: org.sqlite.JDBC 

我怎樣才能運行這個例子？

Answer 1

我只是想設置CLASSPATH環境變量，而不是

export CLASSPATH=`pwd`/sqlitejdbc-v056.jar 
jython ./db.py 

和它的工作。