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You can use ssh-agent to save yourself from constantly having to enter private keys. With this program, you can cache keys for a given shell environment. After starting ssh-agent from a shell prompt, you need to add the passphrase for the private key that belongs to it. This is something that you ll do for a specific shell, so, after you close that specific shell or load another shell, you ll need to add the passphrase to that shell again. After adding a passphrase to ssh-agent, the passphrase is stored in RAM, and only the user who added the key to RAM is able to read it from there. Also, ssh-agent listens only to ssh and scp commands that you ve started locally, so there s no way that you can access a key that is kept by ssh-agent over the network. So you can be sure that using ssh-agent is pretty secure. Apart from being secure, it s pretty easy as well. Enabling ssh-agent and adding a passphrase to it is a simple two-step procedure:

Caution If you use delete without any arguments, it will delete all rows in the table, so be careful! Most

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Multicolumn primary keys are common in tables that connect two other tables in a many-to-many relationship. A classic many-to-many relationship is the relationship of students and classes. Any one student can register for multiple classes. Most classes have multiple students. A table for storing student grades across multiple classes can have at least three columns. One column can identify the class, such as a ClassID number. A second column can identify individual students with another number, such as StudentID. A third column can store the grade for the student in the class. The CH04PKStudentGrades.sql file shows the syntax for defining a multicolumn primary key in a table called ClassGrades. The CREATE TABLE for the table follows. The ClassID and StudentID columns each have an int data type. The GradeLetter column stores grades. This column has a varchar(2) type. The first character of the GradeLetter column denotes a letter for the grade, and the second column optionally records a + or for grades such as A+ or A . The name for the primary key constraint is PK_ClassGrades. The two columns defining the primary key are ClassID and StudentID. Notice the declaration for this constraint appears at the same level as the column declarations.

1. From the shell prompt, use ssh-agent followed by the name of the shell you want to use it from. For example, use ssh-agent /bin/bash to activate ssh-agent for the Bash shell. 2. Now type ssh-add. You ll be prompted for the passphrase of your current private key, and you ll then see the message identity added, followed by the private key whose passphrase is added to ssh-agent.

CREATE TABLE ClassGrades( ClassID int, StudentID int, GradeLetter varchar(2), Constraint PK_ClassGrades PRIMARY KEY(ClassID, StudentID) ) The following three INSERT statements attempt to add three new rows to the ClassGrades table. The first statement adds a grade of A for the student with a StudentID of 1 in the class with a ClassID of 1. The second statement adds a grade of B for another student with a StudentID of 2 in the same class as the first student. The third INSERT statement designates a grade of C for a student in the class with a ClassID of 1. This statement does not specify a value for StudentID. Because StudentID is a part of the table s primary key, SSE automatically imposes a NOT NULL constraint for the column. As a result of the missing value for StudentID, the third INSERT statement fails and does not add a new row. INSERT ClassGrades VALUES(1,1,'A') INSERT ClassGrades VALUES(1,2,'B-') INSERT ClassGrades (ClassID, GradeLetter) VALUES(1,'C-') An excerpt from the listing for running the script in CH04PKStudentGrades.sql describes the error message for the null value for StudentID in the third INSERT statement. Then, the listing enumerates the two rows added to the ClassGrades table. The statement generating the following output is SELECT * FROM ClassGrades. Msg 515, Level 16, State 2, Line 4 Cannot insert the value NULL into column 'StudentID', table 'ProSSEAPPSCh04.dbo.ClassGrades'; column does not allow nulls. INSERT fails. The statement has been terminated. ClassID StudentID GradeLetter ----------- ----------- ----------1 1 A 1 2 B-

So far, we ve been very nice to our models and have been making them happy by providing them with just the information that they need. But we know that in the previous chapter, we provided validations that were preventing us from saving bad records to the database. Specifically, we told the Event model that it should never allow itself to be saved to the database if it isn t provided a title and location. Taking a look at the Event model, shown in Listing 4-1, you can recall how validations are specified.

A CHECK constraint can also have multiple columns. In the context of the ClassGrades table, you can specify a set of valid letter grades and a range of valid integer values to denote classes. Rows with GradeLetter values outside the letter range or ClassID values outside of scope of valid numbers for classes can be rejected by a CHECK constraint. The following CREATE TABLE statement is from the Ch04CheckPKStudentGrades.sql file. The file s contents are exactly the same as for the CREATE TABLE statement in the preceding sample, except for one constraint.

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