pycharm操作mysql数据库 创建表 向表中插入数据 操作mysql数据库查询 修改 删除数据

时间：2024-11-07 07:22:31

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1，安装PyMySQL模块

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语法为 pip install PyMySQL
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2，集成环境里面操作MySQL数据库创建表

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# 导入pymysql
import pymysql

# 创建连接
con = (host="localhost", user="root", password="root", database="test", port=3306)

# 创建游标对象
cur = ()

# 编写创建表的sql
sql = """
    create table python_student(
    sno int primary key auto_increment,
    sname varchar(30) not null,
    age int(2),
    score float(3,1)
    )
"""

try:
    # 执行创建表的sql
    (sql)
    print("创建表成功")
except Exception as e:
    print(e)
    print("创建表失败")
finally:
	# 关闭游标连接
	()
    # 关闭数据库连接
    ()

可打开Navicat查看创建完成的表

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3，向创建的表中插入数据

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1，插入单条数据

# 导入pymysql
import pymysql

# 创建连接
con = (host="localhost", user="root", password="root", database="test", port=3306)

# 创建游标对象
cur = ()

# 编写插入数据的sql
sql = "insert into python_student (sname,age,score) values (%s, %s, %s)"

try:
    # 执行sql
    (sql, ("小强", 18, 99.5))
    ()
    print("插入数据成功")
except Exception as e:
    print(e)
    ()
    print("插入数据失败")
finally:
	# 关闭游标连接
	()
    # 关闭数据库连接
    ()

2，插入多条数据

# 导入pymysql
import pymysql

# 创建连接
con = (host="localhost", user="root", password="root", database="test", port=3306)

# 创建游标对象
cur = ()

# 编写插入数据的sql
sql = "insert into python_student (sname,age,score) values (%s, %s, %s)"

try:
    # 执行sql
    (sql, [("小强", 18, 97.5),("小二", 19, 98.5),("小五", 20, 99.5)])
    ()
    print("插入数据成功")
except Exception as e:
    print(e)
    ()
    print("插入数据失败")
finally:
	# 关闭游标连接
	()
    # 关闭数据库连接
    ()

**

4，操作mysql数据库查询所有数据

**

# 导入pymysql
import pymysql

# 创建连接
con = (host="localhost", user="root", password="root", database="test", port=3306)

# 创建游标对象
cur = ()

# 编写查询的sql
sql = "select * from python_student"

try:
    # 执行sql
    (sql)
    # 处理结果集
    students = ()
    for student in students:
        # print(student)
        sno = student[0]
        sname = student[1]
        age = student[2]
        score = student[3]
        print("sno",sno,"sname",sname,"age",age,"score",score)
except Exception as e:
    print(e)
    print("查询所有数据失败")
finally:
	# 关闭游标连接
	()
    # 关闭数据库连接
    ()

**

5，查询mysql数据库的一条数据

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# 导入pymysql
import pymysql

# 创建连接
con = (host="localhost", user="root", password="root", database="test", port=3306)

# 创建游标对象
cur = ()

# 编写查询的sql
sql = "select * from python_student where sname='小二'"

try:
    # 执行sql
    (sql)
    # 处理结果集
    student = ()

    print(student)
    sno = student[0]
    sname = student[1]
    age = student[2]
    score = student[3]
    print("sno",sno,"sname",sname,"age",age,"score",score)
except Exception as e:
    print(e)
    print("查询所有数据失败")
finally:
	# 关闭游标连接
	()
    # 关闭数据库连接
    ()

**

6，操作mysql数据库修改数据

**

# 导入pymysql
import pymysql

# 创建连接
con = (host="localhost", user="root", password="root", database="test", port=3306)

# 创建游标对象
cur = ()

# 编写修改的sql
sql = 'update python_student set sname=%s where sno=%s'

try:
    # 执行sql
    (sql, ("薛宝钗", 1))
    ()
    print("修改成功")
except Exception as e:
    print(e)
    ()
    print("修改失败")
finally:
	# 关闭游标连接
	()
    # 关闭数据库连接
    ()

**

7，操作mysql数据库删除数据

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# 导入pymysql
import pymysql

# 创建连接
con = (host="localhost", user="root", password="root", database="test", port=3306)

# 创建游标对象
cur = ()

# 编写删除的sql
sql = 'delete from python_student where sname=%s'

try:
    # 执行sql
    (sql, ("薛宝钗"))
    ()
    print("删除成功")
except Exception as e:
    print(e)
    ()
    print("删除失败")
finally:
	# 关闭游标连接
	()
    # 关闭数据库连接
    ()

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