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from tqdm import tqdm
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class SyncService:
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def __init__(self, mysql_conn, ch_conn, mapper, schema_path):
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self.mysql_conn = mysql_conn
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self.ch_conn = ch_conn
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self.mapper = mapper
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self.schema_path = schema_path
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self.columns = None # 初始化为None，稍后加载
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def create_ch_table(self,table):
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"""创建ClickHouse表"""
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with open(self.schema_path, 'r', encoding='utf-8') as f:
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create_sql = f.read()
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client = self.ch_conn.connect()
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client.execute("DROP TABLE IF EXISTS "+table) # 删除表（如果存在）
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client.execute(create_sql) # 创建新表
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def _load_table_columns(self,table):
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"""加载表的列信息"""
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result = self.ch_conn.connect().execute("DESCRIBE TABLE "+table)
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return [row[0] for row in result]
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# 同步数据
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def sync_data(self, table, batch_size):
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# 加载表的列信息
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self.columns = self._load_table_columns(table)
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# 统计个数的连接
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count_conn = self.mysql_conn.create_count_connection()
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# 读取数据的连接
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mysql_conn = self.mysql_conn.connect()
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with count_conn.cursor() as count_cursor:
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count_cursor.execute("SELECT COUNT(*) FROM " + table)
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total = count_cursor.fetchone()[0]
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with mysql_conn.cursor() as cursor:
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cursor.execute("SELECT * FROM " + table + " ORDER BY id")
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progress = tqdm(total=total, desc="同步进度", unit="rec")
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batch = []
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while True:
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row = cursor.fetchone()
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if not row:
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break
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mapped = self.mapper.map_row(self.columns, row)
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batch.append(mapped)
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if len(batch) >= batch_size:
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self._insert_batch(batch,table)
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progress.update(len(batch))
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batch = []
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if batch:
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self._insert_batch(batch,table)
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progress.update(len(batch))
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progress.close()
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def _insert_batch(self, batch, table):
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"""批量插入数据到ClickHouse"""
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self.ch_conn.connect().execute(
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'INSERT INTO ' + table + ' VALUES',
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batch,
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types_check=True,
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settings={
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'date_time_input_format': 'best_effort',
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'allow_experimental_analyzer': 0,
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'input_format_null_as_default': 1
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}
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)
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