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  • Oracle使用随机数插入表数据

    http://blog.sina.com.cn/s/blog_61c006ea0100m2uo.html

    1、create table testd(id int,name char(5));

    begin
    for i in 1..1000000 loop
        insert into testd values(
           i, to_char(dbms_random.random()));
    end loop;
    commit;
    end;
    /

    ---------------------------------------------

    ERROR at line 1:
    ORA-12899: value too large for column "BREIN"."TESTA"."NAME"(actual: 9, maximum: 5)
    ORA-06512: at line 3

    ----------------------------------------------------------------------------------------

      原因为name的字段宽度太小了

    begin
    for i in 1..3 loop
        insert into testd values(
           i, to_char(dbms_random.random()));
    end loop;
    commit;
    end;
    /

    ---------------------------------------------------

    ERROR at line 1:
    ORA-12899: value too large for column "BREIN"."TESTA"."NAME"(actual: 9, maximum: 5)
    ORA-06512: at line 3

    ----------------------------------------------------------------------------------------

    还报同样的错误。

    2、create table testd(id int,name char(500));

    begin
    for i in 1..1000000 loop
        insert into testd values(
           i, to_char(dbms_random.random()));
    end loop;
    commit;
    end;
    /

    -----------------------------------------------------

    PL/SQL procedure successfully completed.

    -----------------------------------------------------------

    3、create table testd(id int,name varchar2(20),addrvarchar2(20),dele varchar2(20),modi varchar2(20));

    begin
    for i in 1..1000000 loop
        insert into testd values(
           i, to_char(dbms_random.random()),
    dbms_random.random(), dbms_random.random(),
    to_char(dbms_random.random()));
    end loop;
    commit;
    end;
    /

    ---------------------------------------------------------

    PL/SQL procedure successfully completed.

    原来int型的可以默认插入字符型字段中去

    -----------------------------------------------------------

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  • 原文地址:https://www.cnblogs.com/sdmxl/p/9924169.html
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