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"""
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数据库交互模块
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凡是操作数据库的函数均写在该模块
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"""
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import sqlite3
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# 构建一个名为conn的连接对象，实现python程序和SOLite数据库unman_vehicle.db之间的连接
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conn = sqlite3.connect('turndb.db', check_same_thread=False)
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# 创建游标对象，为了进一步操作
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cur = conn.cursor()
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# 外键默认是关闭，若要使用则要设置为打开
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cur.execute("PRAGMA foreign_keys = ON")
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# 返回数据库句柄，可以采用该句柄进行数据库操作
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def get_cur():
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return cur
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# 构建数据表创建及文本数据导入函数
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def create_table(tab_name, col_prop_list, txt_path, conn=conn, cur=cur):
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# 以,为分隔符，将col_prop_list中的元素连接起来
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col_name_props = ','.join(col_prop_list)
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# 如果这个表不存在，就创建这个表，括号内是列名
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cur.execute('CREATE TABLE IF NOT EXISTS %s( %s)' % (tab_name, col_name_props))
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# 以只读的方式打开 txt_path,返回一个文件描述符
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f = open(txt_path, 'r')
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for x in f:
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# 以，为分隔符分割x中的字符，并删除分割好字符右边的空白字符
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x = x.rstrip().split(',')
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# len(x)返回得到x的长度 ？？
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a = ["'%s'" % x[i] for i in range(len(x))]
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# 以，为分隔符将a中的元素连起来
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x = ','.join(a)
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# 插入数据
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cur.execute('INSERT INTO %s VALUES(%s)' % (tab_name, x))
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f.close()
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print('%s 创建成功' % tab_name)
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print('%s 导入成功' % txt_path)
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# 提交事物执行
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conn.commit()
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# 构建数据表创建及文本数据导入函数
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def create_table_without_data(tab_name, col_prop_list, conn=conn, cur=cur):
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# 以,为分隔符，将col_prop_list中的元素连接起来
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col_name_props = ','.join(col_prop_list)
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# 如果这个表不存在，就创建这个表，括号内是列名
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cur.execute('CREATE TABLE IF NOT EXISTS %s( %s)' % (tab_name, col_name_props))
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print('%s 创建成功' % tab_name)
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# 提交事物执行
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conn.commit()
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# 构建数据表结构查询函数
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def table_struct(tab_name, cur=cur):
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cur.execute("PRAGMA table_info(%s)" % tab_name)
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# 返回多个元组，如果没有就返回NOne
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t_struct = cur.fetchall()
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# 在返回的元组的遍历
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for item in t_struct:
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for x in item:
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# 把 x 转换string
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x = str(x)
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# 多值打印是 以制表符为分割，为end添加一个空字符，不换行？
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print(x, sep='\t', end=' ')
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print()
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# 构建数据表内容查询函数
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def table_quer(tab_name='turndb', col_names='*', num_line=None, cur=cur):
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cur.execute('select %s from %s where id=%s' % (col_names, tab_name, 1))
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Li = cur.fetchall()
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"""for line in Li[:num_line]:
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for item in line:
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print(item, sep='\t', end=' ')
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print()"""
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return Li
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# 更新数据
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def update(tab_name='fit_param_Qudong', col_names='*', num_line=None, cur=cur, x=None):
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cur.execute('UPDATE %s SET %s = %s WHERE ID = %s' % (tab_name,col_names,x,1))
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Li = cur.fetchall()
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return Li
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# 获取一定行数的数据
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def table_quer_limit(tab_name, col_names='*', num_line=20, cur=cur):
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sql = 'select %s from %s order by id desc limit 0,%s' % (col_names, tab_name, num_line)
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cur.execute(sql)
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Li = cur.fetchall()
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return Li
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# 添加一列，默认添加类型为float
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def addcol(tab_name, col_name='*', conn=conn, cur=cur):
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cur.execute("ALTER TABLE %s ADD COLUMN '%s' float" % (tab_name, col_name))
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conn.commit()
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# 更新数据
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# 插入数据
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def insert_data(tab_name, data):
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cur.execute('INSERT INTO %s VALUES(%s)' % (tab_name, data))
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conn.commit()
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# 清空表格 @tab_name 表格名称
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def clear_table(tab_name):
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cur.execute('delete from %s ' % tab_name)
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conn.commit()
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# 关闭数据库句柄，要在整个程序运行结束的时候调用该方法
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def close():
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conn.close()
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if __name__ == '__main__':
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pass
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tab_name_3 = 'turndb'
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col_prop_list_3 = ['id','angle',]
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create_table_without_data(tab_name_3, col_prop_list_3)
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