cursor

存储过程

由 匆匆过客 提交于 2019-12-31 05:43:24
存储过程如同一门程序设计语言，同样包含了数据类型、流程控制、输入和输出和它自己的函数库。 --------------------基本语法-------------------- 一 . 创建存储过程 create procedure sp_name() begin ......... end 二 . 调用存储过程 1.基本语法：call sp_name() 注意：存储过程名称后面必须加括号，哪怕该存储过程没有参数传递 三 . 删除存储过程 1.基本语法： drop procedure sp_name// 2.注意事项 (1)不能在一个存储过程中删除另一个存储过程，只能调用另一个存储过程 四 . 其他常用命令 1.show procedure status 显示数据库中所有存储的存储过程基本信息，包括所属数据库，存储过程名称，创建时间等 2.show create procedure sp_name 显示某一个mysql存储过程的详细信息 --------------------数据类型及运算符-------------------- 一、基本数据类型： 略 二、变量： 自定义变量：DECLARE a INT ; SET a=100; 可用以下语句代替：DECLARE a INT DEFAULT 100; 变量分为 用户变量 和 系统变量 ，系统变量又分为会话和全局级变量 用户变量

I cannot access Position of the cursor (move mouse programatically)

由 这一生的挚爱 提交于 2019-12-31 04:13:14
问题 this is my code: private void MoveCursor(int x, int y) { // Set the Current cursor, move the cursor's Position, // and set its clipping rectangle to the form. System.Windows.Forms.Cursor cursorMouse = new System.Windows.Forms.Cursor(System.Windows.Forms.Cursor.Current.Handle); cursorMouse.Position = new System.Drawing.Point(x, y); System.Windows.Forms.Cursor.Clip = new System.Drawing.Rectangle(cursorMouse.Position, cursorMouse.Size); } This is what my console says: Error 11 Member 'System

Vertical vim cursor in command mode

由 半城伤御伤魂 提交于 2019-12-31 04:08:10
问题 Im on mac and I have my terminal cursor set to the vertical bar option. However in vim command mode the cursor is the vertical bar but it wont let me use hjkl to go to the end of the line, it always stops right before the end. This is especially annoying because you have to use the arrow keys in insert mode to make the cursor go the end of the line. Any fix would be appreciated eg: hello worl | d , what I want is hello world | 回答1: I think you're looking for set virtualedit=onemore . From

What is the equivalent of Oracle’s REF CURSOR in MySQL?

由 老子叫甜甜 提交于 2019-12-31 03:57:05
问题 I am trying to make a procdure in mysql that returns me an array with the result, I used to do with the oracle ref cursor, but in mysql do not know how to proceed, I have to pass parameters too... Anyone know how I can do, or have an example to show me? Thank you very much... 回答1: There is no analog of REF CURSOR in MySQL. Stored procedures and functions allow to pass and return only scalar datata types, see the reference here - CREATE PROCEDURE and CREATE FUNCTION Syntax. MySQL cannot

How do I create a dynamic mouse cursor .NET without using interop?

由 强颜欢笑 提交于 2019-12-31 01:45:59
问题 I have an application which I'm interested in eventually porting to mono so I'm trying to avoid using p/invoke's to accomplish this task. I would like to load a cursor dynamically, as in I have a Bitmap that is generated on the fly in the application. From what I can tell the safest way to do it without using p/invoke's is to create a .cur file which I can then load to a memory stream and use the Cursor(Stream) constructor. However I have no idea how to create a .cur file. I found this

Functionally processing a database cursor in Scala

由 拜拜、爱过 提交于 2019-12-31 01:45:16
问题 When I need to read millions of database rows from a PostgreSQL database using the JDBC driver, I always use a cursor, otherwise I will get an OutOfMemoryError. Here is the pattern (pseudocode) that I use: begin transaction execute("declare cursor...") while (true) { boolean processedSomeRows = false resultSet = executeQuery("fetch forward...") while (resultSet.next()) { processedSomeRows = true ... } if (!processedSomeRows) break } close cursor commit This is a more "functional" equivalent

PL/SQL FOR LOOP IMPLICIT CURSOR

由 丶灬走出姿态 提交于 2019-12-30 18:41:20
问题 There are 2 tables EMPLOYEES and DEPARTMENTS with department_id as primary key for DEPARTMENTS and foreign key on EMPLOYEES . I want to print all the employee names that belong to a particular department. I know it can be easily achieved by JOINS or EXPLICIT cursors. I thought why not try with FOR loop and a IMPLICIT cursors. My question is if it is syntactically correct to write INTO like this. If so why is not assigning any values? DECLARE emp_dept_id employees.department_id%TYPE; emp_emp

ORACLE中DBMS_SQL的用法

由 こ雲淡風輕ζ 提交于 2019-12-30 18:37:52
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 对于一般的select操作,如果使用动态的sql语句则需要进行以下几个步骤: open cursor---> parse---> define column---> excute---> fetch rows---> close cursor; 而对于dml操作(insert,update)则需要进行以下几个步骤: open cursor---> parse---> bind variable---> execute---> close cursor; 对于delete操作只需要进行以下几个步骤: open cursor---> parse---> execute---> close cursor; www.2cto.com 例一： create table test(n_id number, v_name varchar2(50), d_insert_date date); alter table test add constraint pk_id primary key(n_id); declare v_cursor number; v_sql varchar2(200); v_id number; v_name varchar2(50); v_date date; v_stat number; begin

open cursor for sql

由 偶尔善良 提交于 2019-12-30 18:17:01
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> open cursor for sql 可以方便的执行动态sql. 动态sql和游标经常性结合在一起使用。 Oracle中Cursor介绍 关键字 概念 类型 异常处理 一 概念 游标是SQL的一个内存工作区，由系统或用户以变量的形式定义。游标的作用就是用于临时存储从数据库中提取的数据块。在某些情况下，需要把数据从存放在磁盘的表中调到计算机内存中进行处理，最后将处理结果显示出来或最终写回数据库。这样数据处理的速度才会提高，否则频繁的磁盘数据交换会降低效率。 二 类型 Cursor类型包含三种: 隐式Cursor，显式Cursor和Ref Cursor（动态Cursor）。 1． 隐式Cursor: 1).对于Select …INTO…语句，一次只能从数据库中获取到一条数据，对于这种类型的DML Sql语句，就是隐式Cursor。例如：Select /Update / Insert/Delete操作。 2)作用：可以通过隐式Cusor的属性来了解操作的状态和结果，从而达到流程的控制。Cursor的属性包含： SQL%ROWCOUNT 整型 代表DML语句成功执行的数据行数 SQL%FOUND 布尔型 值为TRUE代表插入、删除、更新或单行查询操作成功 SQL%NOTFOUND 布尔型 与SQL

Edge customize cursor doesn't work

由 喜夏-厌秋 提交于 2019-12-30 13:00:48
问题 Below is my code, cursor1.cur icon is under the same root folder as index.html. The cur icon can be downloaded from this link: http://samples.msdn.microsoft.com/workshop/samples/author/dhtml/refs/cursors/cursor1.cur It works well in IE11, but doesn't work in Edge. Can anyone help me? Update: if replace cursor1.cur with url: http://samples.msdn.microsoft.com/workshop/samples/author/dhtml/refs/cursors/cursor1.cur. It works in Edge as well. But still I'd like to know how to use relative path in
订阅 cursor