python操作sqlite

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Python操作Sqlite

python3.8.5测试通过

sqlite数据封装为字典类型

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# 核心代码
self.conn.row_factory = self.dict_factory

def dict_factory(self, cursor, row):
        d = {}  
        for idx, col in enumerate(cursor.description):  
            d[col[0]] = row[idx]  
        return d

封装成常用的工具

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# -*- coding: utf-8 -*-
import sqlite3

DATABASE_NAME = 'records.db'

class DbSqliteTool(object):
    def __init__(self):
        self.database = DATABASE_NAME

    def db_conn(self,dictFlag=False):
        self.conn = sqlite3.connect(self.database)
        if dictFlag:
            self.conn.row_factory = self.dict_factory
        self.cursor = self.conn.cursor()

    def db_close(self):
        try:
            if self.cursor:
                self.cursor.close()
        except:
            pass
        try:
            if self.conn:
                self.conn.close()
        except:
            pass
    
    def dict_factory(self, cursor, row):  
        d = {}  
        for idx, col in enumerate(cursor.description):  
            d[col[0]] = row[idx]  
        return d  
    
    def check_params_val(self,params,key):
        return params and key in params and params[key]
    
    def get_params_val(self,params,key):
        if self.check_params_val(params,key):
            return params[key]
        else:
            return ''

    def db_parser_params(self,params):
        sql_table = self.get_params_val(params,'table')
        sql_params = self.get_params_val(params,'params')
        sql_where = self.get_params_val(params,'where')
        if sql_where:
            sql_where = 'WHERE ' + sql_where
        sql = ''
        if self.get_params_val(params,'sql'):
            sql = self.get_params_val(params,'sql')
        elif self.get_params_val(params,'insert_flag'):
            values = ''
            total = len(sql_params.split(','))
            values = ', '.join(['?' for _ in range(total)])
            sql = 'INSERT INTO {table} ({params}) VALUES ({values});'\
.format(table=sql_table,params=sql_params,values=values)
        elif self.get_params_val(params,'update_flag'):
            if sql_params:
                params_arr = sql_params.split(',')
                params_tmp = [ f + ' = ?' for f in params_arr]
                params_val = ', '.join(params_tmp)
            sql = 'UPDATE {table} SET {params} {where};'.format(table=sql_table,\
params=params_val,where=sql_where)
        elif self.get_params_val(params,'delete_flag'):
            sql = 'DELETE FROM {table} {where};'.format(table=sql_table,where=sql_where)
        elif self.get_params_val(params,'select_flag'):
            if not sql_params:
                sql_params = '*'
            group_by = self.get_params_val(params,'group_by')
            if group_by:
                group_by = ' GROUP BY {0}'.format(group_by)
            having = self.get_params_val(params,'having')
            if having:
                having = ' HAVING {0}'.format(having)
            asc = self.get_params_val(params,'order_by_asc')
            if asc:
                asc_arr = asc.split(',')
                asc = [f + ' ASC' for f in asc_arr]
                asc = ','.join(asc)
            desc = self.get_params_val(params,'order_by_desc')
            if desc:
                desc_arr = desc.split(',')
                desc = [f + ' DESC' for f in desc_arr]
                desc = ','.join(desc)
            if asc and desc:
                order_by = 'ORDER BY {0}, {1}'.format(asc,desc)
            elif asc or desc:
                order_by = 'ORDER BY {0} {1}'.format(asc,desc)
            else:
                order_by = ''
            limit = self.get_params_val(params,'limit')
            if limit:
                limit = 'LIMIT {0}'.format(limit)
            last = self.get_params_val(params,'last')
            if last:
                last = '{0}'.format(last)
            sql = 'SELECT {params} FROM {table} {where} {group_by} {having} {order_by} {limit} {last}'\
.format(params=sql_params,table=sql_table,where=sql_where,group_by=group_by,having=having,\
order_by=order_by,limit=limit,last=last)
        return sql

    def update_one(self,sql,values=''):
        try:
            self.db_conn()
            if values:
                self.cursor.execute(sql,values)
            else:
                self.cursor.execute(sql)
            self.conn.commit()
            return True
        except Exception as e:
            print(e)
            self.conn.rollback()
        finally:
            self.db_close()
        return False
    
    def update_batch(self,sql,values=''):
        try:
            self.db_conn()
            if values:
                self.cursor.executemany(sql,values)
            else:
                self.cursor.executemany(sql)
            self.conn.commit()
            return True
        except Exception as e:
            print(e)
            self.conn.rollback()
        finally:
            self.db_close()
        return False

    def insert_one(self,params):
        try:
            params['insert_flag'] = True
            sql = self.db_parser_params(params)
            values = self.get_params_val(params,'values')
            return self.update_one(sql,values)
        except Exception as e:
            print(e)
        return False

    def insert_batch(self,params):
        try:
            params['insert_flag'] = True
            sql = self.db_parser_params(params)
            values = self.get_params_val(params,'values')
            return self.update_batch(sql,values)
        except Exception as e:
            print(e)
        return False

    def update(self,params):
        try:
            params['update_flag'] = True
            sql = self.db_parser_params(params)
            values = self.get_params_val(params,'values')
            return self.update_one(sql,values)
        except Exception as e:
            print(e)
        return False

    def delete(self,params):
        try:
            params['delete_flag'] = True
            sql = self.db_parser_params(params)
            values = self.get_params_val(params,'values')
            return self.update_one(sql,values)
        except Exception as e:
            print(e)
        return False

    def select_one(self,params):
        try:
            params['select_flag'] = True
            sql = self.db_parser_params(params)
            values = self.get_params_val(params,'values')
            self.db_conn(dictFlag=True)
            if values:
                self.cursor.execute(sql,values)
            else:
                self.cursor.execute(sql)
            rows = self.cursor.fetchone()
            return rows
        except Exception as e:
            print(e)
        finally:
            self.db_close()
        return ''

    def select_batch(self,params):
        try:
            params['select_flag'] = True
            values = self.get_params_val(params,'values')
            sql = self.db_parser_params(params)
            self.db_conn(dictFlag=True)
            if values:
                self.cursor.execute(sql,values)
            else:
                self.cursor.execute(sql)
            rows = self.cursor.fetchall()
            return rows
        except Exception as e:
            print(e)
        finally:
            self.db_close()
        return ''

    def count(self,params):
        try:
            params['select_flag'] = True
            values = self.get_params_val(params,'values')
            if not self.check_params_val(params,'params'):
                params['params'] = 'COUNT(1)'
            sql = self.db_parser_params(params)
            self.db_conn()
            if values:
                self.cursor.execute(sql,values)
            else:
                self.cursor.execute(sql)
            return int(self.cursor.fetchone()[0])
        except Exception as e:
            print(e)
        finally:
            self.db_close()
        return 0


if __name__ == '__main__':
    dt = DbSqliteTool()
    # 插入
    insert_models = {
        'name': 'sakura',
        'gender': 'female',
        'age': 18
    }
    dt.insert_one({
        'table': 'test_table',
        'params': ','.join(insert_models.keys()),
        'values': list(insert_models.values())
    })
    # 更新
    update_models = {
        'name': 'sakura',
        'gender': 'female',
        'age': 18
    }
    values = list(update_models.values())
    values.append(1)
    dt.update({
        'table': 'test_table',
        'params': ','.join(update_models.keys()),
        'where': 'id = ?',
        'values': values
    })
    # 删除
    dt.delete({
        'table': 'test_table',
        'where': 'id = ?',
        'values': (1,)
    })
    # 查询
    dt.select_one({
        'table': 'test_table',
        'where': 'id = ?',
        'values': (1,)
    })
    dt.select_batch({
        'table': 'test_table',
        'where': 'id <= ?',
        'values': (10,)
    })
    dt.count({
        'table': 'test_table'
    })
    pass