python-Sqlite3 常用方法

最新推荐文章于 2025-08-14 17:25:02 发布

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本文介绍如何使用Python的sqlite3模块创建、连接SQLite数据库，并演示了表的创建、数据的插入与查询等基本操作流程。

创建/连接数据库

conn = sqlite3.connect('C:/Patent/patent.db')
conn.execute("PRAGMA synchronous = OFF;") 
conn.execute("PRAGMA cache_size = 40000;")
conn.execute("PRAGMA journal_mode = memory;")

遍历数据库中的表

command = "select name from sqlite_master where type='table' order by name;"
cursor = conn.execute(command)
res = cursor.fetchall()
print("DB has %d tables, names are :" %len(res))
for table in res:
    print("%s",%table[0])

创建表

表名称不含变量

 conn.execute('''CREATE TABLE STAFF
                    (
                     NAME               TEXT  NOT NULL,
                     AGE                TEXT,
                     TITLE              TEXT);
                ''')

表名称含变量（动态创建）

DBTable = "TABLE" + str(count)
sqlStr = "CREATE TABLE if not exists " + DBTable + " (ID TEXT, DATE TEXT);"
conn.execute(sqlStr)
conn.commit()

向表中写入数据

DBTable = "TABLE" + str(count)
value = (Array1[j][k], str(Array2[j][k]))
ins = "INSERT OR IGNORE INTO " + DBTable + " (ID, DATE) VALUES (?,?);"
conn.execute(ins, value)
conn.commit()

查询数据项

#查询该公司相关的所有专利
fuzzyName = "%"+Name+"%"
Age = '30'
command = "SELECT *  from TABLE WHERE NAME like '%s' AND AGE like '%s'" %(fuzzyName, Age)
cursor = conn.execute(command)
res = cursor.fetchall()
total = len(res)
if(total)
    #分析每一项数据信息
    for one in res:
        #do something here

更新数据项

value = (newAge, name)
ins = "update TABLE set AGE = ? where NAME = ?;" 
conn.execute(ins, value)
conn.commit()

关闭数据库

conn.close()

注意事项

Sqlite关键字不可用于表名、列名；
表名不可以数字开头；
另附Sqlite官方给出的关键字：

ABORT
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