应用场合：参考网上查询数据表的所有字段名代码，，使用游标生成指定单个表的所有字段名跟逗号组成的用于select 逗号隔开的字段名列表 from字符串等场合。
查询结果输出如下：
当前数据表TB_UD_USER的字段列表字符串为
AH,BIRTHPLACE,BM,CELLPHONE,CJGZRQ,DEPARTMENT2,DJJID,GZCX,GZKH,GZSFZH,HJDZ,HYZK,ID,JHRQ,JTZZ,LAFX_LD,LJDZ,LLY,LXDH,NAME,NXDH,POLICENUMBER,RESERVE1,RESERVE10,RESERVE9,SCCP,SEX,SFJH,SFQBY,SFZ,SPJB,YL_22,ZJ,ZW,ZZMM
当前数据表TB_UD_USER查询所有记录语句为
select AH,BIRTHPLACE,BM,CELLPHONE,CJGZRQ,DEPARTMENT2,DJJID,GZCX,GZKH,GZSFZH,HJDZ,HYZK,ID,JHRQ,JTZZ,LAFX_LD,LJDZ,LLY,LXDH,NAME,NXDH,POLICENUMBER,RESERVE1,RESERVE10,RESERVE9,SCCP,SEX,SFJH,SFQBY,SFZ,SPJB,YL_22,ZJ,ZW,ZZMM from TB_UD_USER
详细脚本代码如下：
–Oracle使用游标查询指定数据表的所有字段名称组合而成的字符串
declare
mytablename NVARCHAR2(200):=’TB_UD_USER’; –定义要查询的数据表名称变量
mystring NVARCHAR2(1000):=’ ‘; –定义要输出的字段名称列表字符串变量
selstring VARCHAR2(2000):=’ ‘; –定义要输出的查询语句字符串变量
cursor mycursor is –定义游标
select distinct TABLE_COLUMN.*,TABLE_NALLABLE.DATA_TYPE,TABLE_NALLABLE.NULLABLE from (select distinct utc.table_name table_name, utc.comments table_comments, ucc.column_name column_name, ucc.comments column_comments from user_tab_comments utc, user_col_comments ucc where utc.table_name = ucc.table_name and utc.table_name not like ‘%_B’ and utc.table_name not like ‘%_Z’ and utc.table_name not like ‘%1%’) TABLE_COLUMN, (select distinct table_name, column_name, nullable, DATA_TYPE from user_tab_cols where table_name not like ‘%_B’ and table_name not like ‘%_Z’ and table_name not like ‘%1%’) TABLE_NALLABLE where TABLE_COLUMN.column_name = TABLE_NALLABLE.column_name and TABLE_COLUMN.TABLE_NAME = TABLE_NALLABLE.table_name and TABLE_COLUMN.TABLE_NAME=mytablename order by TABLE_COLUMN.TABLE_NAME,TABLE_COLUMN.column_name;
myrecord mycursor%rowtype; –定义游标记录类型
Counter int :=0;
begin
open mycursor; –打开游标
if mycursor%isopen then –判断打开成功
loop –循环获取记录集
fetch mycursor into myrecord; –获取游标中的记录
if mycursor%found then –游标的found属性判断是否有记录
begin
–如果是第一个字段
if(mystring=’ ‘) then
mystring:=myrecord.column_name;
else
mystring:=mystring||’,’||myrecord.column_name;
end if;
end;
else
begin
dbms_output.put_line(‘当前数据表’||mytablename||’的字段列表字符串为’);
dbms_output.put_line(mystring);
selstring:=’select ‘||mystring||’ from ‘||mytablename;
dbms_output.put_line(‘当前数据表’||mytablename||’查询所有记录语句为’);
dbms_output.put_line(selstring);
exit;
end;
end if;
end loop;
else
dbms_output.put_line(‘游标没有打开’);
end if;
close mycursor;
end;
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