如果您想了解如何利用Procreate画正圆形?Procreate画正圆形技巧方法的相关知识，那么本文是一篇不可错过的文章，我们将对procreate如何画一个正圆进行全面详尽的解释，并且为您提供关于

如果您想了解如何利用Procreate画正圆形?Procreate画正圆形技巧方法的相关知识，那么本文是一篇不可错过的文章，我们将对procreate如何画一个正圆进行全面详尽的解释，并且为您提供关于CREATE PROCEDURE and CREATE FUNCTION Syntax、procreate pocket如何撤销重做 procreate pocket撤销重做方法介绍、procreate pocket如何撤销重做?procreate pocket撤销重做方法介绍、procreate pocket怎么吸色？procreate pocket吸色教程的有价值的信息。

本文目录一览：

• 如何利用Procreate画正圆形?Procreate画正圆形技巧方法（procreate如何画一个正圆）
• CREATE PROCEDURE and CREATE FUNCTION Syntax
• procreate pocket如何撤销重做 procreate pocket撤销重做方法介绍
• procreate pocket如何撤销重做?procreate pocket撤销重做方法介绍
• procreate pocket怎么吸色？procreate pocket吸色教程

如何利用Procreate画正圆形?Procreate画正圆形技巧方法（procreate如何画一个正圆）

Procreate画正圆形技巧方法。procreate pocket是为iPhone推出的专业画画工具，那么如何利用Procreate画正圆形呢?下面小编准备好了相关的操作方法，还不会的用户一起来看看吧。

1、打开软件，新建一个画布，在空白画布中画一个不规则的圆形，保持不动，圆形就会成为规则的椭圆;

2、然后在利用另一个手指按住屏幕，这时椭圆就会成为正圆形。

以上就是Procreate怎么画正圆形的全部内容，希望以上内容能帮助到朋友们。

———想要了解更多资讯就请继续关注锁定小编吧！

CREATE PROCEDURE and CREATE FUNCTION Syntax

CREATE
    [DEFINER = { user | CURRENT_USER }]
    PROCEDURE sp_name ([proc_parameter[,...]])
    [characteristic ...] routine_body

CREATE
    [DEFINER = { user | CURRENT_USER }]
    FUNCTION sp_name ([func_parameter[,...]])
    RETURNS type
    [characteristic ...] routine_body

proc_parameter:
    [ IN | OUT | INOUT ] param_name type

func_parameter:
    param_name type

type:
    Any valid MySQL data type

characteristic:
    COMMENT ''string''
  | LANGUAGE SQL
  | [NOT] DETERMINISTIC
  | { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }
  | SQL SECURITY { DEFINER | INVOKER }

routine_body:
    Valid SQL routine statement

These statements create stored routines. By default, a routine is associated with the default database. To associate the routine explicitly with a given database, specify the name asdb_name.sp_name when you create it.

The CREATE FUNCTION statement is also used in MySQL to support UDFs (user-defined functions). SeeSection 22.3, “Adding New Functions to MySQL”. A UDF can be regarded as an external stored function. Stored functions share their namespace with UDFs. SeeSection 9.2.4, “Function Name Parsing and Resolution”, for the rules describing how the server interprets references to different kinds of functions.

To invoke a stored procedure, use the CALL statement (see Section 13.2.1, “CALL Syntax”). To invoke a stored function, refer to it in an expression. The function returns a value during expression evaluation.

CREATE PROCEDURE andCREATE FUNCTION require the CREATE ROUTINE privilege. They might also require theSUPER privilege, depending on the DEFINER value, as described later in this section. If binary logging is enabled,CREATE FUNCTION might require the SUPER privilege, as described in Section 18.7, “Binary Logging of Stored Programs”.

By default, MySQL automatically grants the ALTER ROUTINE and EXECUTE privileges to the routine creator. This behavior can be changed by disabling theautomatic_sp_privileges system variable. See Section 18.2.2, “Stored Routines and MySQL Privileges”.

The DEFINER and SQL SECURITY clauses specify the security context to be used when checking access privileges at routine execution time, as described later in this section.

If the routine name is the same as the name of a built-in SQL function, a syntax error occurs unless you use a space between the name and the following parenthesis when defining the routine or invoking it later. For this reason, avoid using the names of existing SQL functions for your own stored routines.

The IGNORE_SPACE SQL mode applies to built-in functions, not to stored routines. It is always permissible to have spaces after a stored routine name, regardless of whetherIGNORE_SPACE is enabled.

The parameter list enclosed within parentheses must always be present. If there are no parameters, an empty parameter list of() should be used. Parameter names are not case sensitive.

Each parameter is an IN parameter by default. To specify otherwise for a parameter, use the keywordOUT or INOUT before the parameter name.

An IN parameter passes a value into a procedure. The procedure might modify the value, but the modification is not visible to the caller when the procedure returns. AnOUT parameter passes a value from the procedure back to the caller. Its initial value isNULL within the procedure, and its value is visible to the caller when the procedure returns. AnINOUT parameter is initialized by the caller, can be modified by the procedure, and any change made by the procedure is visible to the caller when the procedure returns.

For each OUT or INOUT parameter, pass a user-defined variable in theCALL statement that invokes the procedure so that you can obtain its value when the procedure returns. If you are calling the procedure from within another stored procedure or function, you can also pass a routine parameter or local routine variable as an IN or INOUT parameter.

Routine parameters cannot be referenced in statements prepared within the routine; seeSection D.1, “Restrictions on Stored Programs”.

The following example shows a simple stored procedure that uses an OUT parameter:

mysql> delimiter //

mysql> CREATE PROCEDURE simpleproc (OUT param1 INT)
    -> BEGIN
    ->   SELECT COUNT(*) INTO param1 FROM t;
    -> END//
Query OK, 0 rows affected (0.00 sec)

mysql> delimiter ;

mysql> CALL simpleproc(@a);
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT @a;
+------+
| @a   |
+------+
| 3    |
+------+
1 row in set (0.00 sec)

The example uses the mysql client delimiter command to change the statement delimiter from ; to // while the procedure is being defined. This enables the; delimiter used in the procedure body to be passed through to the server rather than being interpreted bymysql itself. See Section 18.1, “Defining Stored Programs”.

The RETURNS clause may be specified only for a FUNCTION, for which it is mandatory. It indicates the return type of the function, and the function body must contain aRETURN value statement. If theRETURN statement returns a value of a different type, the value is coerced to the proper type. For example, if a function specifies anENUM or SET value in the RETURNS clause, but theRETURN statement returns an integer, the value returned from the function is the string for the correspondingENUM member of set of SET members.

The following example function takes a parameter, performs an operation using an SQL function, and returns the result. In this case, it is unnecessary to usedelimiter because the function definition contains no internal; statement delimiters:

mysql> CREATE FUNCTION hello (s CHAR(20))
mysql> RETURNS CHAR(50) DETERMINISTIC
    -> RETURN CONCAT(''Hello, '',s,''!'');
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT hello(''world'');
+----------------+
| hello(''world'') |
+----------------+
| Hello, world!  |
+----------------+
1 row in set (0.00 sec)

Parameter types and function return types can be declared to use any valid data type. TheCOLLATE attribute can be used if preceded by the CHARACTER SET attribute.

The routine_body consists of a valid SQL routine statement. This can be a simple statement such asSELECT or INSERT, or a compound statement written using BEGIN and END. Compound statements can contain declarations, loops, and other control structure statements. The syntax for these statements is described inSection 13.6, “MySQL Compound-Statement Syntax”.

MySQL permits routines to contain DDL statements, such as CREATE and DROP. MySQL also permits stored procedures (but not stored functions) to contain SQL transaction statements such asCOMMIT. Stored functions may not contain statements that perform explicit or implicit commit or rollback. Support for these statements is not required by the SQL standard, which states that each DBMS vendor may decide whether to permit them.

Statements that return a result set can be used within a stored procedure but not within a stored function. This prohibition includesSELECT statements that do not have an INTO var_list clause and other statements such asSHOW, EXPLAIN, and CHECK TABLE. For statements that can be determined at function definition time to return a result set, aNot allowed to return a result set from a function error occurs (ER_SP_NO_RETSET). For statements that can be determined only at runtime to return a result set, a PROCEDURE %s can''t return a result set in the given context error occurs (ER_SP_BADSELECT).

USE statements within stored routines are not permitted. When a routine is invoked, an implicitUSE db_name is performed (and undone when the routine terminates). The causes the routine to have the given default database while it executes. References to objects in databases other than the routine default database should be qualified with the appropriate database name.

For additional information about statements that are not permitted in stored routines, seeSection D.1, “Restrictions on Stored Programs”.

For information about invoking stored procedures from within programs written in a language that has a MySQL interface, seeSection 13.2.1, “CALL Syntax”.

MySQL stores the sql_mode system variable setting in effect when a routine is created or altered, and always executes the routine with this setting in force,regardless of the current server SQL mode when the routine begins executing.

The switch from the SQL mode of the invoker to that of the routine occurs after evaluation of arguments and assignment of the resulting values to routine parameters. If you define a routine in strict SQL mode but invoke it in nonstrict mode, assignment of arguments to routine parameters does not take place in strict mode. If you require that expressions passed to a routine be assigned in strict SQL mode, you should invoke the routine with strict mode in effect.

The COMMENT characteristic is a MySQL extension, and may be used to describe the stored routine. This information is displayed by theSHOW CREATE PROCEDURE and SHOW CREATE FUNCTION statements.

The LANGUAGE characteristic indicates the language in which the routine is written. The server ignores this characteristic; only SQL routines are supported.

A routine is considered “deterministic” if it always produces the same result for the same input parameters, and“not deterministic” otherwise. If neitherDETERMINISTIC nor NOT DETERMINISTIC is given in the routine definition, the default isNOT DETERMINISTIC. To declare that a function is deterministic, you must specifyDETERMINISTIC explicitly.

Assessment of the nature of a routine is based on the “honesty” of the creator: MySQL does not check that a routine declaredDETERMINISTIC is free of statements that produce nondeterministic results. However, misdeclaring a routine might affect results or affect performance. Declaring a nondeterministic routine asDETERMINISTIC might lead to unexpected results by causing the optimizer to make incorrect execution plan choices. Declaring a deterministic routine asNONDETERMINISTIC might diminish performance by causing available optimizations not to be used.

If binary logging is enabled, the DETERMINISTIC characteristic affects which routine definitions MySQL accepts. SeeSection 18.7, “Binary Logging of Stored Programs”.

A routine that contains the NOW() function (or its synonyms) or RAND() is nondeterministic, but it might still be replication-safe. ForNOW(), the binary log includes the timestamp and replicates correctly.RAND() also replicates correctly as long as it is called only a single time during the execution of a routine. (You can consider the routine execution timestamp and random number seed as implicit inputs that are identical on the master and slave.)

Several characteristics provide information about the nature of data use by the routine. In MySQL, these characteristics are advisory only. The server does not use them to constrain what kinds of statements a routine will be permitted to execute.

The SQL SECURITY characteristic can be DEFINER or INVOKER to specify the security context; that is, whether the routine executes using the privileges of the account named in the routineDEFINER clause or the user who invokes it. This account must have permission to access the database with which the routine is associated. The default value isDEFINER. The user who invokes the routine must have theEXECUTE privilege for it, as must the DEFINER account if the routine executes in definer security context.

The DEFINER clause specifies the MySQL account to be used when checking access privileges at routine execution time for routines that have theSQL SECURITY DEFINER characteristic.

If a user value is given for the DEFINER clause, it should be a MySQL account specified as ''user_name''@''host_name'' (the same format used in theGRANT statement), CURRENT_USER, or CURRENT_USER(). The default DEFINER value is the user who executes the CREATE PROCEDURE or CREATE FUNCTION or statement. This is the same as specifyingDEFINER = CURRENT_USER explicitly.

If you specify the DEFINER clause, these rules determine the validDEFINER user values:

For more information about stored routine security, see Section 18.6, “Access Control for Stored Programs and Views”.

Within a stored routine that is defined with the SQL SECURITY DEFINER characteristic,CURRENT_USER returns the routine''s DEFINER value. For information about user auditing within stored routines, seeSection 6.3.12, “SQL-Based MySQL Account Activity Auditing”.

Consider the following procedure, which displays a count of the number of MySQL accounts listed in themysql.user table:

CREATE DEFINER = ''admin''@''localhost'' PROCEDURE account_count()
BEGIN
  SELECT ''Number of accounts:'', COUNT(*) FROM mysql.user;
END;

The procedure is assigned a DEFINER account of ''admin''@''localhost'' no matter which user defines it. It executes with the privileges of that account no matter which user invokes it (because the default security characteristic isDEFINER). The procedure succeeds or fails depending on whether invoker has theEXECUTE privilege for it and ''admin''@''localhost'' has the SELECT privilege for the mysql.user table.

Now suppose that the procedure is defined with the SQL SECURITY INVOKER characteristic:

CREATE DEFINER = ''admin''@''localhost'' PROCEDURE account_count()
SQL SECURITY INVOKER
BEGIN
  SELECT ''Number of accounts:'', COUNT(*) FROM mysql.user;
END;

The procedure still has a DEFINER of ''admin''@''localhost'', but in this case, it executes with the privileges of the invoking user. Thus, the procedure succeeds or fails depending on whether the invoker has theEXECUTE privilege for it and the SELECT privilege for the mysql.user table.

The server handles the data type of a routine parameter, local routine variable created withDECLARE, or function return value as follows:

procreate pocket如何撤销重做 procreate pocket撤销重做方法介绍

如何撤销和重做 procreate pocket 中的绘制？绘画时出现错误在所难免。procreate pocket 提供了撤销和重做功能，让您轻松修复失误。php小编苹果将指导您完成撤销和重做的过程，让您无后顾之忧地进行创作。阅读以下详细说明，了解如何在 procreate pocket 中撤销或重做您的绘制。

procreate pocket如何撤销重做？procreate pocket撤销重做方法介绍

1、打开你的app

2、随便点进行一幅画作，可在左侧看到有一个撤回按钮，点击就能实现撤回

3、或者可以双指轻点屏幕的任意区域来快速撤回

4、在ipad上使用procreate的用户为了防止手掌误触可启用palm support功能

以上就是procreate pocket如何撤销重做 procreate pocket撤销重做方法介绍的详细内容，更多请关注php中文网其它相关文章！

procreate pocket如何撤销重做?procreate pocket撤销重做方法介绍

procreate pocket画画app，这款app是使用iPad进行画画的用户进场能用到的，但平时在使用时也会遇到一些小问题，不小心误碰了，该如何撤销重做呢?想要了解的伙伴随小编一起往下看看。

1、打开你的app

2、随便点进行一幅画作，可在左侧看到有一个撤回按钮，点击就能实现撤回

3、或者可以双指轻点屏幕的任意区域来快速撤回

4、在ipad上使用procreate的用户为了防止手掌误触可启用palm support功能

———想要了解更多资讯就请继续关注锁定小编吧！

procreate pocket怎么吸色？procreate pocket吸色教程

      procreate pocket自带吸色功能，你可以在画布中的任意区域吸取颜色并将它保存到调色盘上，那么procreate

pocket怎么吸色?下面小编给大家介绍procreate pocket吸色教程，一起来学习下吧。

      procreate pocket怎么吸色?procreate pocket吸色教程

      1、打开画布，点击右上角的颜色

      2、点击吸管

      3、选择你要吸取的颜色

      4、可看到颜色会自动改变

      以上这篇文章就是procreate pocket吸色教程，更多精彩教程请关注小编!

今天的关于如何利用Procreate画正圆形?Procreate画正圆形技巧方法和procreate如何画一个正圆的分享已经结束，谢谢您的关注，如果想了解更多关于CREATE PROCEDURE and CREATE FUNCTION Syntax、procreate pocket如何撤销重做 procreate pocket撤销重做方法介绍、procreate pocket如何撤销重做?procreate pocket撤销重做方法介绍、procreate pocket怎么吸色？procreate pocket吸色教程的相关知识，请在本站进行查询。

本文标签：

• procreate
• 画正圆形技巧
• 绘制正圆方法
• 图形设计工具