create or replace procedure pr_export_to_excel(p_table_name varchar2,
p_where_predicate varchar2 default null) is
/*
propose:根据表名和where条件生成excel
p_where_predicate:where条件语句
*/
out_file utl_file.file_type;
str1 varchar2(20000);
str1_chr varchar2(30000);
l_sql varchar2(20000);
l_where_predicate varchar2(30000) default 'where ' || p_where_predicate;
begin
if p_where_predicate is null then
l_where_predicate := null;
end if;
select listagg(column_name, chr(9)) within group(order by column_id)
into str1
from user_tab_columns
where table_name = upper(p_table_name);
select listagg(case
when t.DATA_TYPE = 'DATE' OR t.DATA_TYPE LIKE 'TIMESTAMP%' THEN
'to_char(f_cur.' || column_name || ',''YYYYMMDD HH24:MI:SS'')'
else
'f_cur.' || column_name
END,
'||chr(9)||') within group(order by column_id)
into str1_chr
from user_tab_columns t
where table_name = upper(p_table_name);
l_sql := '
declare
out_file utl_file.file_type; --定义一个文件类型变量
BEGIN
--打开一个文件，指定目录对象、文件名和写入模式
out_file := utl_file.fopen('' DIR_EXCEL '',
''' || p_table_name ||
'.xls '',
'' W '',
32767);
utl_file.put_line(out_file,
''' || str1 ||
'''); --写入字段名，换行
for f_cur in (select *
from ' || p_table_name || ' t ' ||
l_where_predicate || ') loop
utl_file.put_line(out_file, ' || str1_chr || ');
end loop;
utl_file.fclose(out_file);
exception
when others then
utl_file.fclose(out_file); --关闭文件，防止异常关闭
dbms_output.put_line(SQLERRM);
dbms_output.put_line(dbms_utility.format_error_backtrace);
raise; --抛出异常信息
end;
';
dbms_output.put_line(l_sql);
execute immediate l_sql;
exception
when others then
utl_file.fclose(out_file);
dbms_output.put_line(SQLERRM);
dbms_output.put_line(dbms_utility.format_error_backtrace);
raise;
end pr_export_to_excel;
