python讀取blob數據,python blob

本文目錄一覽：

• 1、python如何保存從oracle數據庫中讀取的BLOB文件
• 2、python往mysql的blob字段寫入二進制數據，怎麼做
• 3、怎麼用Python腳本怎麼從oracle數據庫中取出clob數據

python如何保存從oracle數據庫中讀取的BLOB文件

import cx_Oracle

con = cx_Oracle.connect(『username』, 『password』, 『dsn』)

blob_sql = “select column_name from table where clause”

cursor = con.cursor()

cursor.execute(blob_sql)

result = cursor.fetchall()

file = open(‘file_name’, “wb”)

file.write(result[0][0].read()) #可以print查看result的內容，根據實際情況read

file.close()

python往mysql的blob字段寫入二進制數據，怎麼做

這有什麼難的嗎？

你把你的二進制數據可以轉成文本串插入，就跟普通的插入一樣啊。

import MySQLdb, cPickle

# Connect to a DB, e.g., the test DB on your localhost, and get a cursor

connection = MySQLdb.connect(db=”test”)

cursor = connection.cursor( )

# Make a new table for experimentation

cursor.execute(“CREATE TABLE justatest (name TEXT, ablob BLOB)”)

try:

# Prepare some BLOBs to insert in the table

names = ‘aramis’, ‘athos’, ‘porthos’

data = { }

for name in names:

datum = list(name)

datum.sort( )

data[name] = cPickle.dumps(datum, 2)

# Perform the insertions

sql = “INSERT INTO justatest VALUES(%s, %s)”

for name in names:

cursor.execute(sql, (name, MySQLdb.escape_string(data[name])) )

# Recover the data so you can check back

sql = “SELECT name, ablob FROM justatest ORDER BY name”

cursor.execute(sql)

for name, blob in cursor.fetchall( ):

print name, cPickle.loads(blob), cPickle.loads(data[name])

finally:

# Done. Remove the table and close the connection.

cursor.execute(“DROP TABLE justatest”)

connection.close( )

怎麼用Python腳本怎麼從oracle數據庫中取出clob數據

stmt = con.prepareStatement(“select attach,fjmc,piid,swsj from　receiveFile　”);//attach是clolb對象

rs = stmt.executeQuery( );

while (rs.next()) {

java.sql.Blob blob = rs.getBlob(1);//這一句可獲得blob，clob等對象。

然後再把blob轉成文件

File file = new File(“G:\\XiangMu_dwoa\\數據庫文件資料\\aaa”);

OutputStream fout = new FileOutputStream(file);

//下面將BLOB數據寫入文件

byte[] b = new byte[1024];

int len = 0;

while ( (len = ins.read(b)) != -1) {

fout.write(b, 0, len);

你可以參考一下