Python連線SQLite資料庫

sqlite作為一款輕型資料庫，管理工具有很多，比如sqlite expert professional，很適合用來儲存python**，爬蟲的相關資料，下面列出基本的增刪查改操作

讀取操作：

conn1 =sqlite3.connect(board.databasepath)

conn1.row_factory =sqlite3.row
conn1.execute(
"pragma foreign_key=on")
c1 =conn1.cursor()
try:
#執行查詢操作
c1.execute("
\select username as username \
from \
register \
where name=?;
", \
(username,))
#異常處理
except
(sqlite3.databaseerror) as e:
print
e    
return
none
else
:    user_row =c1.fetchone()
#呼叫資料
finally
:    conn1.close()
#關閉連線

conn =sqlite3.connect(board.databasepath)

conn.row_factory =sqlite3.row
conn.execute(
"pragma foreign_key=on")
c =conn.cursor()
md5 =hashlib.md5()
md5.update(password)
encrypted_passwd =md5.hexdigest()
try:
#增加資料
c.execute("
\              insert into register (name,work,email,username,password) values (?,?,?,?,?);
", \
(name, workplace, email, username, encrypted_passwd))
c.execute(
"select last_insert_rowid() as user_id from register;")
except
(sqlite3.databaseerror) as e:
print
e    conn.rollback()
return
false
else
:    conn.commit()
return
true
finally
:    conn.close()

conn=sqlite3.connect(board.databasepath)

conn.execute(
"pragma foreign_key=on")
conn.row_factory=sqlite3.row
c=conn.cursor()
try:
c.execute("\
delete from setting where key=? and parent_id=?;",\
(self.slick.key,self.id))
except
(sqlite3.databaseerror) as e:
print
e    conn.rollback()
return
false
else
:    conn.commit()
self.slick.items.pop(self.id)
self=none
return
true
finally
:    conn.close()    

conn=sqlite3.connect(board.databasepath)

conn.execute(
"pragma foreign_key=on")
conn.row_factory=sqlite3.row
c=conn.cursor()
try:
c.execute("\
update setting set value=? where key=? and name=?;",\
(self.title,self.key,
"jumbotron_title"))
c.execute("\
update setting set value=? where key=? and name=?;",\
(self.content,self.key,
"jumbotron_content"))
except
(sqlite3.databaseerror) as e:
print
e    conn.rollback()
return
false
else
:    conn.commit()
return
true
finally
:    conn.close()

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