Python3-cx_Oracle模块-数据库操作之Oracle

模块安装

　　1.安装cx_Oracle模块之前必须要安装Oracle客户端,否则无法使用

　　2.系统上需要装有对应版本的c++编译套件(Linux下:g++ Windows下:VC++)

参考文档

　　https://oracle.github.io/python-cx_Oracle/

　　http://cx-oracle.readthedocs.io/en/5.3/index.html

代码示例

import cx_Oracle

conn = None
cursor = None
try:
    # 1.连接数据库
    # conn = cx_Oracle.Connection("username", "password", "13.13.13.123:1521/orcl")
    # 或
    conn = cx_Oracle.connect("username/password@13.13.13.123:1521/orcl")

    # 2.创建游标对象
    cursor = conn.cursor()

    # 3.执行插入语句
    sql = "INSERT INTO TAB_STUDENT(ID,NAME,AGE) VALUES(:id, :name,:age)"
    sql_args = {"id": 30, "name": "Jet", "age": 18}
    cursor.execute(sql, sql_args)
    print(cursor.rowcount)

    # 3.批量执行插入语句
    # sql = "INSERT INTO TAB_STUDENT(ID,NAME,AGE) VALUES(:1, :2, :3)"
    # sql_args = [
    #     (10, "Jesdsat", 18,),
    #     (11, "Jedsadt", 18,),
    #     (12, "Jeadst", 18,),
    #     (13, "Jedast", 18,),
    # ]
    # cursor.executemany(sql, sql_args)     # 执行多条插入语句的方法
    sql = "INSERT INTO TAB_STUDENT(ID,NAME,AGE) VALUES(:id, :name, :age)"
    sql_args = [
        {"id": 20, "name": "Jet", "age": 18},
        {"id": 21, "name": "Jet", "age": 18},
        {"id": 22, "name": "Jet", "age": 18},
        {"id": 23, "name": "Jet", "age": 18},
        {"id": 24, "name": "Jet", "age": 18},
        ]
    cursor.executemany(sql, sql_args)     # 执行多条插入语句的方法
    print(cursor.rowcount)                # 获取受影响的行数

    # 4.提交事务
    conn.commit()
except Exception as ex:
    pass
finally:
    # 5.关闭游标与连接
    cursor.close()
    conn.close()

增-INSERT

---

import cx_Oracle

conn = None
cursor = None
try:
    # 1.连接数据库
    conn = cx_Oracle.connect("username/password@13.13.13.123:1521/orcl")

    # 2.创建游标对象
    cursor = conn.cursor()

    # 3.执行删除语句
    sql = "DELETE FROM TAB_STUDENT WHERE ID = :id"
    sql_args = {"id": 30}
    cursor.execute(sql, sql_args)
    print(cursor.rowcount)                # 获取受影响的行数

    # 4.提交事务
    conn.commit()
except Exception as ex:
    pass
finally:
    # 5.关闭游标与连接
    cursor.close()
    conn.close()

删-DELETE

---

import cx_Oracle

conn = None
cursor = None
try:
    # 1.连接数据库
    conn = cx_Oracle.connect("username/password@13.13.13.123:1521/orcl")
    # 2.创建游标对象
    cursor = conn.cursor()
    # 3.执行更新语句
    sql = "UPDATE TAB_STUDENT SET NAME = :new_name WHERE ID = :id"
    sql_args = {"id": 1, "new_name": "Jack"}
    cursor.execute(sql, sql_args)
    print(cursor.rowcount)                # 获取受影响的行数
    # 4.提交事务
    conn.commit()
except Exception as ex:
    pass
finally:
    # 5.关闭游标与连接
    cursor.close()
    conn.close()

改-UPDATE

---

import cx_Oracle
conn = None
cursor = None
try:
    # 1.连接数据库
    conn = cx_Oracle.connect("username/password@13.13.13.123/orcl")
    # 2.创建一个游标对象Cursor对象
    cursor = conn.cursor()
    # 3.执行查询语句
    sql = "SELECT * FROM TAB_STUDENT WHERE USER_NAME=:user_name AND MOBILE=:mobile"
    sql_args = {"user_name": "qq1207501666", "mobile": 18888888888}
    cursor.execute(sql, sql_args)
    # 4.提取查询结果
    print(cursor.fetchone())      # 提取一行结果,相当于cursor.next()
    # cursor.fetchmany(3)         # 提取3行结果
    # cursor.fetchall()           # 提取全部结果
except Exception as ex:
    pass
finally:
    # 8.关闭游标与连接
    cursor.close()
    conn.close()

查-SELECT

---

# 1.使用"命名参数"进行绑定
sql = "SELECT * FROM TAB_STUDENT WHERE ID = :ID"
sql_args = {"ID": 1}
cursor.execute(sql, sql_args)   # 传入的是一个字典

# 2.使用"位置参数"进行绑定
sql = "SELECT * FROM TAB_STUDENT WHERE ID = :1"
sql_args = (888,)
cursor.execute(sql, sql_args)   # 传入的是一个元组

SQL语句绑定参数的两种方式