oracle 导出insert sql

将oracle表中数据以insert into 语句导出，存储过程实现

创建游标对象

create or replace package test.PK_EXPORT_TABLE  is  type result is ref cursor;end ;

创建存储过程

CREATE OR REPLACE PROCEDURE P_EXPORT_TABLE(v_table in varchar,
cresult out PK_EXPORT_TABLE.result 
) 
as
TYPE v_cur_tab_columns IS REF CURSOR;/*表各字段信息*/
v_tab_columns v_cur_tab_columns;
v_sql_columns varchar2(500);/*查询字段信息*/
v_column_infor user_tab_columns%rowtype; /*行字录各字段数型为USRE_TAB_COLUMNS*/
v_sqlstr_part_1 varchar2(200):='';/*存放形成sql的第一部分*/
v_sqlstr_part_2 varchar2(500):='';/*存放形成sql的第二部分*/
v_sqlstr_part_3 varchar2(4000):='';/*存放形成sql的第三部分*/
v_sql varchar2(5000):='';/*存放形成的sql*/
v_sqlneed varchar2(100):=','||''''||','||''''||','; /*形成在VALUES中的分隔符 ”, “ */
begin
v_sqlstr_part_1:='insert into '||upper(v_table)||' (';
/*查询表中各字段信息*/
v_sql_columns:='select * from user_tab_columns where table_name='||''''||UPPER(v_table)||''''||' AND data_type not in ('||''''||'BLOB'||''''||','||''''||'CLOB'||''''||') AND ROWNUM<20';
open  v_tab_columns for v_sql_columns;
loop
fetch v_tab_columns into v_column_infor;
exit when v_tab_columns%notfound;
/*用于形成insert into table (。。。)中的字段*/
    v_sqlstr_part_2:=v_sqlstr_part_2||v_column_infor.COLUMN_NAME||',';
    /*用于形成values (。。。)中的字段*/
    v_sqlstr_part_3:=case
    when v_column_infor.DATA_TYPE='DATE' THEN v_sqlstr_part_3||'to_date(to_char('||'BZRQ'||','||''''||'yyyy-mm-dd hh24:mi:ss'||''''||'), '||''''||'yyyy-mm-dd hh24:mi:ss'||''''||')'||v_sqlneed    
    when v_column_infor.DATA_TYPE='VARCHAR2' OR v_column_infor.DATA_TYPE='VARCHAR' or v_column_infor.DATA_TYPE='CHAR' THEN v_sqlstr_part_3||' case when '||v_column_infor.column_name||' IS NOT NULL THEN '||''''''''''||'||'||v_column_infor.COLUMN_NAME||'||'||''''''''''||' ELSE NULL END AS '||v_column_infor.COLUMN_NAME||v_sqlneed
    when v_column_infor.DATA_TYPE='NUMBER' THEN v_sqlstr_part_3||' case when '||v_column_infor.column_name||' IS NOT NULL THEN '||v_column_infor.COLUMN_NAME||' ELSE NULL END AS '||v_column_infor.COLUMN_NAME||v_sqlneed
    else
    --v_sqlstr_part_3||' case when '||v_column_infor.column_name||' IS NOT NULL THEN '||''''''''''||'||'||v_column_infor.COLUMN_NAME||'||'||''''''''''||' ELSE NULL END AS '||v_column_infor.COLUMN_NAME||v_sqlneed
    v_sqlstr_part_3||'NULL'||v_sqlneed
    end;    
end loop;
/*去掉最后的“，”并加上VALUES*/
v_sqlstr_part_2:=substr(v_sqlstr_part_2,0,length(v_sqlstr_part_2)-1)||') values (';
/*去掉最后的“，“*/
v_sqlstr_part_3:=substr(v_sqlstr_part_3,0,length(v_sqlstr_part_3)-5)||','||''')''';
/*形成的sql*/
v_sql:='SELECT '''||v_sqlstr_part_1||v_sqlstr_part_2||''''||','||v_sqlstr_part_3||' FROM '||upper(v_table)||' ';
/*打开游标并返回*/
open cresult for v_sql;
Exception 
when others then
  open cresult for 'select * from '||v_table;
--outstr:=v_sql;
end P_EXPORT_TABLE;