Yast Online Update Installation Source Has Been Corrupted Meaning

Hsqldb User Guide. HSQLDB version 1. SQL statements and syntax described. Notational Conventions Used in this Chapter. All objects of the schema will. Requires Administrative privileges. ALTER TABLE < tablename> ADD .

The optional BEFORE. It accepts a column. Definition as in a CREATE TABLE command. If NOT NULL. is specified and the table is not empty, then a default value must be.

In Linux, Logical Volume Manager (LVM) is a device mapper target that provides logical volume management for the Linux kernel. Most modern Linux distributions are LVM. If you notice any mistakes in this document, please email the author listed at the beginning of the chapter. If you have problems with the.

Download the official source code using the links below. We recommend running the ClamAV Stable Version on production systems. Not the right format for your operating. Latest trending topics being covered on ZDNet including Reviews, Tech Industry, Security, Hardware, Apple, and Windows. Windows' System Restore feature is a good way of making and maintaining entire system backups. If only Linux had a similar feature. Chapter 1, Introduction. Provides introductory material on Linux, Slackware, and the Open Source and Free Software Movements. Chapter 2, Help. Describes the help.

In all other respects, this command is the equivalent of a. CREATE TABLE statement. If an SQL view includes a SELECT * FROM < tablename> in its. This is a. non- standard feature which is likely to change in the future. ALTER TABLE < tablename> DROP .

Will drop any single- column. The command will. It will also fail if an SQL view includes the column. ALTER TABLE < tablename> ALTER COLUMN < columnname> RENAME TO < newname> Changes a column name. ALTER TABLE < tablename> ALTER COLUMN < columnname> SET DEFAULT < defaultvalue>. Use NULL to remove.

ALTER TABLE < tablename> ALTER COLUMN < columnname> SET . It always works when the type of change.

ALTER TABLE < tablename> ALTER COLUMN < columnname>. RESTART WITH < new sequence value> This form is used exclusively for IDENTITY columns and changes the. ALTER TABLE < tablename> ADD . In the current version, a. ALTER TABLE < tablename> ADD . This will not work if there. This will work only if the values of the column list for the.

ALTER TABLE < tablename> ADD . Password must be double. For. reasons of backwards compatibility, the initial schema value will not be. HSQLDB version 1. This command returns a. Result. Set with one column and one row (the result) just like a SELECT. See also: Stored Procedures / Functions, SQL Expression.

CHECKPOINT . Password should be. Example: CREATE ALIAS ABS FOR . The. qualifier DESC can be present for command compatibility with other. Unique indexes can be defined but this. Use UNIQUE constraints instead. The name of an index must.

See also: CREATE TABLE, DROP INDEX. CREATE ROLE < rolename> ;Creates the named role with no members. Requires Administrative. CREATE SCHEMA < schemaname> AUTHORIZATION < grantee>. The authorization grantee may be a.

Optional (nested) CREATE and GRANT statements can be given only. Only the last nested statement. In. the example below, a new schema, ACCOUNTS, is created, then two tables. The default type is INTEGER. The default start. Negative values are not allowed.

If a. sequence goes beyond Integer. MAXVALUE or Long. MAXVALUE, the next result. The next value for a sequence can be included in SELECT, INSERT. UPDATE statements as in the following example: SELECT . If the database is all- in- memory, both MEMORY and CACHED forms. CREATE TABLE return a MEMORY table while the TEXT form is not.

Components of a CREATE TABLE commandcolumn. Definitioncolumnname Datatype . Or a datetime SQL function such as. CURRENT. Identity.

They must be of INTEGER or. BIGINT type and are automatically primary key columns (as a. IDENTITY column present). Using the long SQL syntax the (START. WITH < n> ) clause specifies the first value that will be. The last inserted value into an identity column for a. IDENTITY(), for example.

Id is the identity column): INSERT INTO Test (Id, Name) VALUES (NULL,'Test'). CALL IDENTITY(); constraint.

Definition. In the current version of HSQLDB, the conditions for. CHECK constraint can only reference the current row, meaning. SELECT statement.

Sample table definitions with. CHECK constraints are in. Test. Self. Check.

Constraints. txt. This file is in. the /hsqldb/testrun/hsqldb/ directory of the zip. General syntax limitations. HSQLDB databases are initially created in a legacy mode that.

You can set the. property: sql. When this property has been set, Any supplied column size. CHARACTER and. VARCHAR) are enforced. Use the command, SET PROPERTY. Other constraints cannot be part of the column definition. TEMPORARY TABLE contents for each session (connection) are.

The optional. qualifier ON COMMIT PRESERVE ROWS can be used to keep the rows. The default is ON COMMIT DELETE. ROWS. See also: DROP TABLE.

CREATE TRIGGER < name> . It is the fire method of this class that is. You should provide this class.

Trigger. Class is present in. Since 1. 7. 2 the implementation has been changed and enhanced. When. the 'fire' method is called, it is passed the following. String name, String table, Object row. The. mapping of members of the row arrays to database types is specified in. Data Types. For. example, BIGINT is represented by a java. Long. Object. Note that the number of elements in the row arrays.

Never. modify the last elements of the array, which are not part of the actual. If the trigger method wants to access the database, it must.

JDBC connection. This can cause data inconsistency and. The. jdbc: default: connection: URL is not currently. Implementation note: If QUEUE 0 is specified, the fire method is execued in the same. This allows trigger action to alter the. Data can be checked or. BEFORE INSERT / UPDATE + FOR EACH ROW triggers.

All table. constraints are then enforced by the database engine and if there is a. SQL command that initiated the.

INSERT or UPDATE. There is an exception to this rule, that is with.

UPDATE queries, referential integrity and cascading actions resulting. ON UPDATE CASCASE / SET NULL / SET DEFAULT are all performed prior.

If an invalid value that breaks. Alternatively, if the trigger is used for external communications. This is in the interests of not blocking the.

When this happens, the trigger's. Trigger. Class. fire. There is a queue of events waiting to be. This is particularly useful for 'FOR EACH. ROW' triggers, when a large number of trigger events occur in rapid.

If the. queue becomes full, subsequent additions to it cause the database engine. Take great care to avoid this. This can be avoided either by ensuring the QUEUE. NOWAIT parameter. The default queue size is 1.

Note also that the timing of. With a non- zero QUEUE parameter, if the trigger methods modifies. Please refer to the code for org.

Trigger and org. hsqldb. Trigger. Sample for more information on how to write a trigger class. See also: DROP TRIGGER.

CREATE USER < username> PASSWORD < password> . Password. must be double quoted. Empty password can be made using . You can. change a password afterwards using a ALTER USER.

The data accessible through a view is not stored in the database. What is stored in the database is a SELECT. The result set of the SELECT statement forms the virtual. A user can use this virtual table by.

SQL statements the same way a table is. A view is used to do any or all of these functions: Restrict a user to specific rows in a table.

For example. allow an employee to see only the rows recording his or her work in. Restrict a user to specific columns. For example, allow. Join columns from multiple tables so that they look like a. Aggregate information instead of supplying details. For. example, present the sum of a column, or the maximum or minimum.

Views are created by defining the SELECT statement that retrieves. The data tables referenced by the. SELECT statement are known as the base tables for the view. In this. example, is a view that selects data from three base tables to present a.

CREATE VIEW mealsjv AS. SELECT m. mid mid, m. FROM meals m, mealtypes t, authors a. WHERE m. mealtype = t. AND m. aid = a. aid; You can then reference mealsjv in statements in the same way you.

A view can reference another view. For example, mealsjv presents. A. view can be built that selects only specific mealsjv columns: CREATE VIEW mealswebv AS SELECT name, author FROM mealsjv; The SELECT statement in a VIEW definition should return columns.

If the names of two columns in the SELECT statement. A list of. new column names can always be defined for a view. It is not required to call this command. JDBC interface: it is called automatically when the. After disconnecting, it is not possible to execute.

CONNECT) with this connection. See also: CONNECT. DROP INDEX index . Will not work if.

Slackware Linux Essentials. Alan Hicks. Chris Lumens. David Cantrell. Logan Johnson. Copyright . Where those designations appear in this document, and. Slackware Linux, Inc. We also hope you'll lend it to all of your friends when they come asking about. Slackware Linux operating system you're running.

While this book may not an edge- of- your- seat novel, we certainly tried to make it as. With any luck, we'll get a movie deal.

Of course, we also hope. And now, on with the show. Changes from. the First Edition. This second edition is the culmination of years of hard work by the dedicated members. Slackware Documentation Project.

The following are the major changes in this new. Chapter 3, Installation, has been modified with new. CD installation. Chapter 4, System Configuration, has been updated. Linux 2. 6. x kernels. Chapter 5, Network Configuration, has been.

Samba, NFS, and DHCP. A section on wireless. This chapter now reflects major changes in how Slackware. Chapter 6, X Window System, has been substantially. Xorg based systems. This chapter now also covers the xdm graphical login. Chapter 1. 3, Basic Network Commands, has been.

Chapter 1. 4, Security, is a new chapter with this edition. It. explains how to keep a Slackware Linux system secure. Chapter 1. 7, Emacs, is a new chapter with this edition.

It. describes how to use Emacs, a powerful editor for Unix. Chapter 1. 8, Package Management, has been updated. Slack. Build scripts. There are many other changes, both minor and major, to reflect changes in Slackware as.

Organization of this Book. Chapter 1, Introduction. Provides introductory material on Linux, Slackware, and the Open Source and Free.

Software Movements. Chapter 2, Help. Describes the help resources available on a Slackware Linux system and online. Chapter 3, Installation.

Describes the installation process step- by- step with screenshots to provide an. Chapter 4, System Configuration. Describes the important configuration files and covers kernel recompilation.

Chapter 5, Network Configuration. Describes how to connect a Slackware Linux machine to a network. Covers TCP/IP. PPP/dial- up, wireless networking, and more.

Chapter 6, The X Window System. Describes how to setup and use the graphical X Window System in Slackware. Chapter 7, Booting. Describes the process by which a computer boots into Slackware Linux. Also covers. dual- booting with Microsoft Windows operating systems. Chapter 8, The Shell.

Describes the powerful command line interface for Linux. Chapter 9, Filesystem Structure. Describes the filesystem structure, including file ownership, permission, and. Chapter 1. 0, Handling Files and Directories. Describes the commands used to manipulate files and directories from the command line.

Chapter 1. 1, Process Control. Describes the powerful Linux process management commands used to manage multiple. Chapter 1. 2, Essential System Administration. Describes basic system administration tasks such as adding and removing users. Chapter 1. 3, Basic Network Commands.

Describes the collection of network clients included with Slackware. Chapter 1. 4, Security. Describes many different tools available to help keep your Slackware system secure. Chapter 1. 5, Archive Files. Describes the different compression and archive utilities available for Linux. Chapter 1. 6, vi. Describes the powerful vi text editor.

Chapter 1. 7, Emacs. Describes the powerful Emacs text editor. Chapter 1. 8, Slackware Package Management. Describes the Slackware package utilities and the process used to create custom. Chapter 1. 9, Zip. When Does Ecas Get Updated Browser. Slack. Describes the Zip.

Slack version of Linux that can be used from Windows without. Appendix A, The GNU General Public License. Describes the license terms under which Slackware Linux and this book can be copied. Conventions used in.

To provide a consistent and easy to read text, several conventions are followed. Typographic Conventions. Italic. An italic font is used for. Monospace. A monospaced font is used for error messages, commands. Bold. A bold font is used for user input in examples.

User Input. Keys are shown in bold to stand out from other text. Key. combinations that are meant to be typed simultaneously are shown with `+' between the keys, such as: Ctrl+Alt+Del. Meaning the user should type the Ctrl, Alt, and Del keys at the same time. Keys that are meant to be typed in sequence will be separated with commas, for. Ctrl+X, Ctrl+SWould mean that the user is expected to type the Ctrl and X keys simultaneously and then to type the Ctrl. S keys simultaneously. Examples. Examples starting with E: \> indicate a MS- DOS.

Unless otherwise noted, these commands may. Command Prompt” window in a modern Microsoft. You can login as root to. Examples starting with % indicate a command that should be. Unless otherwise noted, C- shell syntax is used for. Acknowledgments. This project is the accumulation of months of work by many dedicated individuals.

It. would not have been possible for me to produce this work in a vacuum. Many people deserve. Keith Keller for his work on wireless networking.

Joost Kremers for his great work in single- handedly writing the emacs section, Simon. Williams for the security chapter, Jurgen Phillippaerts for basic networking commands. Cibao Cu Ali G Colibri for the inspiration and a good kick in the pants.

Countless others. An incomplete list includes: Jacob Anhoej, John Yast. Sally Welch, Morgan Landry, and Charlie Law.

I'd also like to thank Keith Keller for. Carl Inglis for the initial web. Last but not least, I'd like to thank Patrick J. Volkerding for Slackware Linux.

David Cantrell, Logan Johnson, and Chris Lumens for Slackware Linux Essentials 1st. Edition. Without their initial framework, none of this would have ever happened. Many. others have contributed in small and large ways to this project and have not been listed. He started the project because he wanted to run a Unix- based operating system. In addition, he wanted to learn the ins and outs of the.

Linux was released free of charge to the public so that anyone could study. General Public License. It has been ported to run on a variety of system architectures, including. HP/Compaq's Alpha, Sun's SPARC and Ultra. SPARC, and Motorola's Power. PC chips (through. Apple Macintosh and IBM RS/6.

Hundreds, if not thousands, of programmers. Linux. It runs programs like Sendmail, Apache, and BIND. Internet servers. It's important to remember. Linux” really refers to the kernel - the core of the operating. This core is responsible for controlling your computer's processor, memory, hard. That's all Linux really does: It controls the operations of your.

Various companies and. They entitled their effort GNU, a. GNU's Not Unix”. GNU software ran atop.

Linux kernel from day 1. Their compiler gcc was used to. Today many GNU tools from gcc to gnutar are still at the basis of every major Linux distribution. For. this reason many of the Free Software Foundation's proponents fervently state that their. Linux kernel. They strongly suggest that all. Linux distributions should refer to themselves as GNU/Linux distributions.

This is the topic of many flamewars, surpassed only by the ancient vi versus emacs. The purpose of this book is not to fan the fires of this heated discussion, but. When one sees GNU/Linux it means a Linux. When one sees Linux they can either be referring to the kernel, or to a. It can be rather confusing.

Typically the term GNU/Linux isn't used because. Slackware, started by Patrick Volkerding in late 1. July 1. 7, 1. 99.

Linux distribution to achieve widespread use. One of the few distributions available at the time was SLS Linux from Soft.

Landing Systems. Volkerding used SLS Linux, fixing bugs as he found them. Eventually, he. decided to merge all of these bugfixes into his own private distribution that he and his. This private distribution quickly gained popularity, so Volkerding. Slackware and make it publicly available. Along the way, Patrick added. Slackware; a user friendly installation program based on a menuing system.