便捷输出sql查询结果为TXT/CSV文件

1. 创建存储过程sql_to_csv

create or replace procedure sql_to_csv(p_query in varchar2, --sql query statement
p_dir in varchar2, --the directory of file
p_filename in varchar2, --the export filename
p_max_linesize in number default 32000 --max linesize,must less than 32787
) is
l_output utl_file.file_type;
l_theCursor integer default dbms_sql.open_cursor;
l_columnValue varchar2(4000);
l_status integer;
l_colCnt number := 0;
l_separator varchar2(1);
l_descTbl dbms_sql.desc_tab;
begin
--open file
l_output := utl_file.fopen(p_dir, p_filename, 'w', p_max_linesize);
--define date format
execute immediate 'alter session set nls_date_format=''yyyy-mm-dd hh24:mi:ss''';
--open cursor
dbms_sql.parse(l_theCursor, p_query, dbms_sql.native);
dbms_sql.describe_columns(l_theCursor, l_colCnt, l_descTbl);
--dump table column name
for i in 1 .. l_colCnt loop
/*
utl_file.put(l_output,
l_separator || '"' || l_descTbl(i).col_name || '"');
*/ --注释1
dbms_sql.define_column(l_theCursor, i, l_columnValue, 4000);
l_separator := ',';
end loop;
-- utl_file.new_line(l_output); --注释1和本行都注释表示输出到文件不输出表列名
--execute the query statement
l_status := dbms_sql.execute(l_theCursor);
-- generate file
--dump table column value
while (dbms_sql.fetch_rows(l_theCursor) > 0) loop
l_separator := '';--表示文件里面数据行首分隔符
for i in 1 .. l_colCnt loop
dbms_sql.column_value(l_theCursor, i, l_columnValue);
utl_file.put(l_output, l_separator || l_columnValue); --generate txt file
--utl_file.put( l_output, l_separator || '"' ||trim(both ' ' from replace(l_columnValue,'"','""')) || '"'); -- generate csv file
l_separator := ','; --separator表示文件里面数据分隔符
end loop;
utl_file.new_line(l_output);
end loop;
--close cursor
dbms_sql.close_cursor(l_theCursor);
--close file
utl_file.fclose(l_output);
exception
when others then
raise;
end sql_to_csv;
/

2. 创建导出文件的目录

SQL> create directory test as '/home/oracle';

Directory created.

3. 调用存储过程，导出txt或csv文件

SQL> exec sql_to_csv('select * from test','TEST','test.txt'); # 参数：sql语句+directory name+导出文件名(sql语句中如果有引号要使用转义，另外directorr name要大写)

PL/SQL procedure successfully completed.