Oracle 生成流水号函数
CREATE OR REPLACE FUNCTION fn_no_make(v_type VARCHAR2,v_number_col VARCHAR2,
v_table_name VARCHAR2)
/*
* 编码示例：DJJT12090600003
* author: Rock.et
* create date: 2012/09/06
* 参数说明：
* v_type: 编码前缀
* v_number_col：编码所在列名
* v_table_name：编码所在表名
*/
RETURN VARCHAR2 IS
v_old_no VARCHAR2(50); --原编码
v_old_numNUMBER; -- 原编码后五位编号
v_new_numVARCHAR2(10); --新编码后五位编号
v_maked_no VARCHAR2(50); --新编码
v_date_noVARCHAR2(20); --当前日期编号
v_sql VARCHAR2(4000);
BEGIN
v_sql := 'SELECT MAX(' || v_number_col || ') FROM ' || v_table_name;
EXECUTE IMMEDIATE v_sql
INTO v_old_no;
v_sql := 'SELECT SUBSTR(TO_CHAR(SYSDATE,''YYMMDD''), 1, 6) AS DATE_NO FROM DUAL';
EXECUTE IMMEDIATE v_sql
INTO v_date_no;
v_old_num := to_number(substr(v_old_no, 11, 5));
v_new_num := to_char(v_old_num + 1);
WHILE length(v_new_num) < 5
LOOP
v_new_num := '0' || v_new_num;
END LOOP;
IF v_old_no IS NULL OR
substr(v_old_no, 5, 6) <> v_date_no
THEN
v_maked_no := v_type || v_date_no || '00001';
ELSE
v_maked_no := v_type || v_date_no || v_new_num;
END IF;
RETURN(v_maked_no);
EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line(SQLERRM);
END fn_no_make;
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