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  • EXEC SQL BEGIN DECLARE SECTION;...VARCHAR b[10000][31]; char c[3]; EXEC SQL END DECLARE SECTION; ... int delete_rows=10000; ... 1. CHAR类型数组变量 EXEC SQL for :delete_rows

    EXEC SQL BEGIN DECLARE SECTION;
    char a[10000][3];
    VARCHAR b[10000][31];
    char c[3];
    EXEC SQL END DECLARE SECTION;

    ...

    int delete_rows=10000;

    ...


    1. CHAR类型数组变量

    EXEC SQL for :delete_rows

    delete FROM table_name

    WHERE a= :a;

    由于char对应于Oracle的char类型,因此若有空格,则此时char即使用memset初始化,但也会带有后面的空格,有可能造成delete时where a=:a由于空格不匹配无法删除,例如:a赋值为'a’,但数组长度是3,因此实际where条件是a='a ',因为空格导致不能删除。


    2. VARCHAR类型数组变量

    EXEC SQL for :delete_rows

    delete FROM table_name

    WHERE b= :b;

    对于VARCHAR类型对应于Oracle的VARCHAR类型,因此不存在1中的空格问题,会自动滤掉空格,这是最好的一种匹配方法。

    对于删除的数据量,会选择delete_rows与b数组的容量中最小的一个值。


    3. CHAR类型变量

    这里指的是char字符串变量,不是数组,此时使用:

    EXEC SQL for :delete_rows

    delete FROM table_name

    WHERE c= :c;

    由于c只是一个变量字符串,此时delete_rows会失效,只会执行一次该语句,有多少条删除多少条记录。


    总结:

    1. 对于VARCHAR类型数组,Oracle会根据指定删除行数的整数,与array host数组变量的容量之间,选择一个最小值,保证最小删除的行。

    2. 对于CHAR类型字符串,就相当于一个常量,此时Oracle由于不能判断delete ... where c=:c;实际需要删除多少行,所以干脆也不判断了,就执行一次。开始我认为for :delete_rows类似于使用where rownum <= delete_rows,但这个场景是如此判断,想必不会是rownum这种方式做。


    同理,UPDATE与DELETE相同。

    另外,值得提一句,EXEC SQL BEGIN DECLARE SECTION;中char和VARCHAR类型可以不是二维数组,但其它类型的变量必须不能是这种二维数组。


    参考:

    The host variables in the WHERE clause must be either all scalars or all arrays. If they are scalars, Oracle executes the DELETE statement only once. If they are arrays, Oracle executes the statement once for each set of array components. Each execution may delete zero, one, or multiple rows.
    Array host variables in the WHERE clause can have different sizes. In this case, the number of times Oracle executes the statement is determined by the smaller of the following values:
    ■The size of the smallest array
    ■The value of the :host_integer in the optional FOR clause

    展开全文
  • <p>I would like to know how i can get my array varchar in my psql database in array string in go for render it in json. <p>I actually do that <p>In creation of my table i create my column like that ...
  • --字符串序列要这样 declare ... type t is table of number(3) index by varchar2(3); hash_t t; l_row varchar2(3); begin hash_t('a') := 10; hash_t('b') := ...

    --字符串序列要这样
    declare
        type t   is table of number(3) index by varchar2(3);
       hash_t t;  
       l_row varchar2(3);
      begin
      hash_t('a') := 10;
      hash_t('b') := 20;  
      l_row :=hash_t.first;
      while(l_row is not null) loop
      dbms_output.put_line(hash_t(l_row));
      l_row:=hash_t.next(l_row);
      end loop;
      end;
    --数字序列可以这样
    declare
        type t   is table of number(3) index by pls_integer;
       hash_t t;  
       l_row varchar2(3);
      begin
      hash_t(1) := 10;
      hash_t(2) := 20;  
      for i in hash_t.first .. hash_t.last loop
      dbms_output.put_line(hash_t(i));
      end loop;
      end;

    转载于:https://www.cnblogs.com/pangblog/p/3289789.html

    展开全文
  • (1)返回数组: 新建数组类型,此处以nested table类型的数组举例:create or ...程序调用如下:filterAuditGraduation函数返回XH类型数组,程序调用得到返回的varchar数组。 1 Connection conn = null; ...

    (1)返回数组:

    新建数组类型,此处以nested table类型的数组举例:create or replace type XH is table of varchar2(32);

    程序调用如下:filterAuditGraduation函数返回XH类型数组,程序调用得到返回的varchar数组。

     1                 Connection conn = null;
     2                 OracleCallableStatement stmt = null;
     3                 Class.forName("oracle.jdbc.OracleDriver");
     4                 conn = DriverManager.getConnection("jdbc:oracle:thin:@202.96.28.250:1521:test", "new_prd", "heerTOccmu8");
     5                 stmt = (OracleCallableStatement) conn.prepareCall("begin ?:= pkg_cj_jw_graduation.filterAuditByZy('"+id+"'); end;");
     6                 stmt.registerOutParameter(1, OracleTypes.ARRAY, "XH");
     7                 stmt.execute();
     8                 ARRAY simpleArray = stmt.getARRAY(1);
     9                 Datum[] datas=simpleArray.getOracleArray();
    10                 StringBuffer xhs = new StringBuffer("");
    11                 for (int i = 0; i < datas.length; i++){
    12                    String xh = new String(datas[i].shareBytes());
    13                    if(i == (datas.length - 1)) xhs.append(xh);
    14                    else xhs.append(xh +",");
    15                 }

    (2)返回游标:

    返回sys_refcursor

    程序调用在上面的基础上修改如下:

      stmt.registerOutParameter (1, OracleTypes.CURSOR);   

      stmt.setString (1"1234");   

      stmt.execute ();   

      ResultSet rset = (ResultSet)stmt.getObject (1);   

      while (rset.next ())   

        System.out.println (rset.getString ("EName"));   

      rset.close();   

      call.close();   

      conn.close();   

     

    转载于:https://www.cnblogs.com/xh6210/archive/2012/06/27/2565469.html

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  • I have a varchar2 field and want to split it to array of charsLike 'ABCDEF' --> 'A' 'B' 'C' 'D' 'E'How can i convert my Field Values to chars array?解决方案If you actually mean a PL/SQL collection ...

    I have a varchar2 field and want to split it to array of chars

    Like 'ABCDEF' --> 'A' 'B' 'C' 'D' 'E'

    How can i convert my Field Values to chars array?

    解决方案

    If you actually mean a PL/SQL collection of characters, you could do something like

    SQL> ed

    Wrote file afiedt.buf

    1 declare

    2 type char_arr is table of char(1) index by pls_integer;

    3 l_str varchar2(100) := 'ABCDEF';

    4 l_arr char_arr;

    5 begin

    6 for i in 1 .. length(l_str)

    7 loop

    8 l_arr(i) := substr( l_str, i, 1 );

    9 end loop;

    10 dbms_output.put_line( l_arr.count );

    11* end;

    SQL> /

    6

    PL/SQL procedure successfully completed.

    Without understanding the business requirements, though, I would tend to be very suspicious. When you find yourself breaking apart strings in PL/SQL, that almost always implies that you have stored data in a non-atomic form and need to address the data model issue.

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  • 关联数组的错误 $array = ['id' => '03657', 'kf_phone ' => 18796442]; 然后你再读取的时候就需要 $array['id'] 而不是$array[id];这样会报错的 mysql insert varchar 原生的错误 还有在insert的...
  • 数组

    2014-02-05 21:22:02
    1、在PKG包体内建数组 TYPE rec_client IS RECORD(  policy_no VARCHAR2(16),  payee_no VARCHAR2(100),  pay_no VARCHAR2(16),  amount NUMBER(16, 2)); TYPE list_client_am
  • sql erver varchar类型能不能存储BYTE[]数组?我知道varbinrary可以存储,想问下varchar能不能存?比如有5个byte,存进去后是占5个字节吗?
  • <p>My other alternative is to first encode my array of bytes to a string and then saving that string as VARCHAR. But I feel adding the encoding/decoding part could lead to errors like the encoder ...
  • oracle 数组

    2014-09-29 13:49:49
    oracle 数组
  • oracle数组

    2014-11-18 11:04:32
     type type_array is varray(10) of varchar2(20); --一维数组,字符串类型  var_array type_array:=type_array('ggs','jjh','wsb','csl','dd','bb'); begin  for i in 1..
  • Oracle数组

    2020-12-10 09:34:15
    TYPE t_table IS TABLE OF VARCHAR2(36) INDEX BY BINARY_INTEGER;...–bulk collect INTO 数组赋值 SELECT m.REF_PART_ID bulk collect INTO V_REF_PART_IDS FROM CM.T_CM_BU_REF_PART m FOR i IN 1 … V_REF
  • 1.自定义数组格式 eg: type type_array is table of varchar(20) index by binary_integer;...‘varchar(20)’是数组元素的类型,‘index by binary_integer’表示数组内的索引   2.声明数组 使用上面自定义...
  • 有些是字符串,另一些是int,这些是在mysql中用类型(int,varchar)定义的。我创建的数组如下:(由于太长而缩小了数组)[3] => Array([account_id] => *******[month_id] => 201903[month_comment] => 4,5% ...
  • 在本章中,我们将讨论学习PL/SQL中的数组。 PL/SQL编程语言提供了一种称为VARRAY的数据结构,它可以存储相同类型的元素的固定大小顺序集合。varray用于存储有序的数据集合,但通常最好将数组视为相同类型变量的集合...
  • Oracle存储过程 一维数组 二维数组 (范例) /* 在PL/SQL中是没有数组(Array)概念的。但是如果程序员想用Array的话,就得变通一下,用TYPE 和Table of Record来代替多维数组,一样挺好用的。 emp_type 就好象一个...
  • 设有整型二维数组a[3][4]如下:0 1 2 34 5 6 78 9 10 11它的定义为:int a[3][4]={{0,1,2,3},{4,5,6,7},{8,9,10,11}}设数组a的首地址为1000,各下标变量的首地址及其值如图所示。前面介绍过,C语言允许把一个二维...
  • PG数组使用

    千次阅读 2019-09-02 21:42:20
    PG数组使用实例 实例 建表 create table test(id int, name_list varchar[]); 插数据(注意一下使用了两种不同的语法格式) insert into test values(1, ARRAY['lxm','lxm2']); insert into test values(2, ...
  • 数组操作

    2016-11-30 14:18:37
    create or replace procedure SFGL_XF_SFBZ(p_xn in varchar2, p_czr in varchar2, o_errMsg out varchar2) is /...
  • PLSQL数组

    2016-05-27 13:24:00
    type t_varchar_arr is TABLE OF varchar2(60); type t_number_arr is TABLE OF number; v_date t_varchar_arr; v_age t_number_arr; begin v_date := t_varchar_arr('20160429', '20160516'...
  • 昨天在摸索mysql的时候,找不到mysql定义数组的方法,于是在网上...CREATE FUNCTION split ( regex VARCHAR ( 1024 ), Num INTEGER ) RETURNS VARCHAR ( 64 ) DETERMINISTIC BEGIN RETURN SUBSTRING_INDEX( SUBSTRI

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