CREATEPROCEDUREGetEmployees()BEGINDECLAREdoneINTDEFAULTFALSE;DECLAREemp_nameVARCHAR(255);-- 创建一个游标DECLAREcurCURSORFORSELECTnameFROMemployees;-- 打开游标OPENcur;-- 遍历结果集read_loop:LOOP-- 读取下一行数据FETCHcurINTOemp_name;-- 如果没有更多数据,则退出循环IFdoneTHENLEAVEread_loop;ENDIF;-- 显...
from dba_data_files order by tablespace_name; 3、查看回滚段名称及大小 select segment_name, tablespace_name, r.status, (initial_extent/1024) InitialExtent,(next_extent/1024) NextExtent, max_extents, v.curext CurExtent From dba_rollback_segs r, v$rollstat v Where r.segment_id = v.usn(+...
请将"your_database"、"your_username"、"your_password"、"your_host"、"your_port"替换为实际的数据库连接信息。 创建游标对象: 代码语言:txt 复制 cur = conn.cursor() 编写SQL查询语句,使用占位符(%s)表示变量: 代码语言:txt 复制 sql = "SELECT column1, column2 FROM table_name WHERE condition1 =...
A cursor with the name 'cur1' already exists. A fatal scripting error occurred. The file specified for :r command was not found error, please help. A file activation error occurred. The physical file name may be incorrect while creating database A practical approach the Nested Sets when cre...
cur.execute("SELECT * FROM Writers") numrows=int(cur.rowcount) foriinrange(numrows): row=cur.fetchone() printrow[0],row[1] finally: con.close() 分类:Use Python to operate Mysql database 好文要顶关注我收藏该文微信分享 __MagicPower ...
请将"your_host"替换为数据库主机地址,"your_database"替换为数据库名称,"your_user"替换为数据库用户名,"your_password"替换为数据库密码。 创建一个游标对象以执行SQL查询。 代码语言:txt 复制 cur = conn.cursor() 使用SELECT查询并重命名列名。
OPEN cur FOR 'SELECT name FROM my_table PARTITION ('||mypartition||')';--NEW FETCH cur INTO rec;--NEW WHILE cur%FOUND--NEW LOOP utl_file.put(out_file, rec.name); utl_file.new_line(out_file); FETCH cur INTO rec;--NEW END LOOP; CLOSE cur; --NEW utl_file.fclose (out_file)...
conn = pm.connect(host='localhost',user='sa',password='momogua',database='test') cur = conn.cursor() #获取student表的数据,格式化 cur.execute('select sid,sname,ssex,sage from student') student = cur.fetchall() dstudent = DataFrame(student,columns=['sid','sname','ssex','sag...
rows=cur.fetchall() column_names=[i[0]foriincur.description] fp=open('test.csv','w') myFile=csv.writer(fp,delimiter=',', quotechar='"', quoting=csv.QUOTE_ALL) myFile.writerow(column_names) myFile.writerows(rows) fp.close()
FOR SELECT id, name FROM your_table; DECLARE CONTINUE HANDLER FOR NOT FOUND SET v_done = TRUE; OPEN cur; read_loop: LOOP FETCH cur INTO v_id, v_name; IF v_done THEN LEAVE read_loop; END IF; -- 在这里处理每条记录 SELECT v_id, v_name; END LOOP; CLOSE cur; END // DELIMITER...