标签:oracle的显式游标
declare cursor user_cur is select * from my_user; user_row my_user%rowtype; begin open user_cur; loop fetch user_cur into user_row; exit when user_cur%notfound; dbms_output.put_line(user_row.user_id||'----'||user_row.name); end loop; close user_cur; end;declare cursor user_cur is select * from my_user; row_user my_user%rowtype; begin open user_cur; loop fetch user_cur into row_user; exit when user_cur%notfound; dbms_output.put_line(row_user.user_id||'----'||row_user.name||'----'||row_user.age); end loop; close user_cur; end;
declare cursor row_user is select * from my_user; type my_user_tab is table of my_user%rowtype; /* 定义和表my_user行对象一致的集合类型cur_row_user, 用于存放批量得到的数据 */ cur_row_user my_user_tab; begin open row_user; loop /*从结果集中提取数据,每次提取两行*/ fetch row_user bulk collect into cur_row_user limit 2; /*遍历集合cur_row_user中的数据*/ for i in 1..cur_row_user.count loop dbms_output.put_line(cur_row_user(i).user_id||'----'||cur_row_user(i).name||'----'||cur_row_user(i).age); end loop; exit when row_user%notfound; end loop; close row_user; end;
declare cursor user_cur is select * from my_user; type my_user_tab is table of my_user%rowtype; /* 定义和表my_user行对象一致的集合类型cur_user_cur, 用于存放批量得到的数据 */ cur_user_cur my_user_tab; begin open user_cur; loop /*从结果集中提取数据,每次提取两行*/ fetch user_cur bulk collect into cur_user_cur limit 2; /*遍历集合cur_user_cur中的数据*/ for i in 1..cur_user_cur.count loop dbms_output.put_line(cur_user_cur(i).user_id||'----'||cur_user_cur(i).name||'----'||cur_user_cur(i).age); end loop; exit when user_cur%notfound; end loop; close user_cur; end;
declare cursor user_cur is select * from my_user; begin for cdr in user_cur loop dbms_output.put_line(cdr.user_id||'----'||cdr.name||'----'||cdr.age); end loop; end; /*cursor for loop 不需要特别的申明变量,它可以提取出行对象类型数据*/
declare cursor user_cur is select * from my_user; cdr my_user%rowtype; begin if user_cur%isopen then fetch user_cur into cdr; dbms_output.put_line(cdr.user_id||'----'||cdr.name||'----'||cdr.age); else dbms_output.put_line('游标没有打开'); end if; end;
declare cursor user_cur is select * from my_user; cdr my_user%rowtype; begin open user_cur; if user_cur%isopen then loop fetch user_cur into cdr; exit when user_cur%notfound; dbms_output.put_line(cdr.user_id||'----'||cdr.name||'----'||cdr.age); end loop; else dbms_output.put_line('游标没有打开'); end if; end;
declare cursor user_cur is select * from my_user; cdr my_user%rowtype; begin open user_cur; loop fetch user_cur into cdr; if user_cur%found then dbms_output.put_line(cdr.user_id||'----'||cdr.name||'----'||cdr.age); else dbms_output.put_line('游标没有打开'); exit; end if; end loop; end;
declare /*这里的取值写在declare和begin中都可以*/ v_user_id my_user.user_id%type:='&v_user_id'; /*这里的v_user_id的类型写number和my_user.user_id%type都可以*/ cursor c_my_user(v_user_id my_user.user_id%type) is select * from my_user where user_id=v_user_id; cdr my_user%rowtype; begin open c_my_user(v_user_id); loop fetch c_my_user into cdr; if c_my_user%found then dbms_output.put_line(cdr.user_id||'----'||cdr.name||'----'||cdr.age); else dbms_output.put_line('游标没有打开'); exit; end if; end loop; end;
标签:oracle的显式游标
原文地址:http://blog.51cto.com/matengbing/2044941