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} return NULL; // end of getCommonName() method } // get all details of the entity represented by this->certificate // aka, the Distinguished Name public function getDN() { if ( isset( $this->x509['subject'] ) ) { return $this->x509['subject']; } return NULL; // end of getDN() method } // find common name of the issuer of this->certificate public function getCACommonName() { if ( isset( $this->x509['issuer']['CN'] ) ) { return $this->x509['issuer']['CN']; } return NULL; // end of getCACommonName() method } // get all details of the issuer of this->certificate // aka, the Certificate Authority public function getCA() { if ( isset( $this->x509['issuer'] ) ) { return $this->x509['issuer']; } return NULL; // end of getCA() method } // end of openSSL class } > These methods simply return the relevant parts of $this->x509, which was created either when makeKeys() generated a new certificate, or when an existing certificate was passed to certificate() to become the active public key. As we mentioned before, the OpenSSL module doesn t have the same setup/cleanup overhead that the mcrypt module does, so we don t need any kind of destructor function. The reader who is even more paranoid than we are may wish to attempt to overwrite part of the memory used by this class, overwriting the value of $this->privatekey for instance. But it must be noted, if this concerns you, that the private key s password is used in a number of locations, and all of those references would need to be scrubbed as well. In this situation, the effort doesn t seem worthwhile to us.

ALTER TABLE modifies the structure of an existing table. See Listing E-18 for a description of its format.

package faq; import java.io.Serializable; public class Question implements Serializable { private String questionText; private String answerText; private boolean isShowingAnswer = false; private int rating = 0; public Question(String questionText, String answerText) { this.questionText = questionText; this.answerText = answerText; } public String getQuestionText() { return questionText; } public String getAnswerText() { return answerText; } public String trigger() { isShowingAnswer = !isShowingAnswer; return null;

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Listing E-18. The SQL Statement ALTER TABLE ALTER TABLE tbl_name <alter_tbl_op> [, <alter_tbl_op> ...]; <alter_tbl_op> = { ADD <col_def> | ADD <tbl_constr> | DROP col_name | DROP CONSTRAINT constr_name | <alter_col_def> } <alter_col_def> = { ALTER [COLUMN] col_name SET DEFAULT <val> /* MySQL, postgreSQL */ | ALTER [COLUMN] col_name DROP DEFAULT /* MySQL, postgreSQL */ | CHANGE [COLUMN] col_name <col_def> /* MySQL */ | MODIFY [COLUMN] <col_def> /* MySQL */ | ALTER [COLUMN] col_name { SET | DROP } NOT NULL /* PostgreSQL */ | RENAME [COLUMN] col_name TO new_col_name /* PostgreSQL */ | ALTER [COLUMN] col_name TO new_col_name /* FirebirdSQL */ | ALTER [COLUMN] TYPE new_col_type /* FirebirdSQL */ } As you can see from Listing E-18, the DBMS vendors once more haven t managed to agree on how you can modify columns. The addition or removal of columns and table constraints is pretty straightforward. Refer to CREATE TABLE for a description of <col_def> and <tbl_constr>. What you can do in terms of changing the definition of an existing column depends on which DBMS you ve chosen. Only MySQL gives you full flexibility in redefining the column with ALTER TABLE tbl_name CHANGE col_name <col_def>. Note that <col_def> must be complete, including a column name. If you don t want to change the name of a column, you can use its current name within <col_def>. In fact, besides being compatible with Oracle, the only reason for having MODIFY is that you don t need to type the same column name twice.

A third typical task that requires encryption is the verification or protection of the integrity of data. If you need to make sure that binaries or scripts or data have not been affected by outside modification (whether that modification is accidental, as in transmission errors, or deliberate, as in sabotage), then you are faced with this task.

} public boolean isShowingAnswer() { return isShowingAnswer; } public String rate() { System.out.println("Setting rating to: " + rating); return null; } public int getRating() { return rating; } public void setRating(int rating) { this.rating = rating; } }

UPDATE modifies the content of one or more existing rows in a table (or view). See Listing E-19 for a description of its format. Listing E-19. The SQL Statement UPDATE UPDATE {tbl_name | view_name} SET col_name = <val> [, col_name = <val> ...] [WHERE <where_condition>] ; For example, use the statement UPDATE employee_tbl SET first_name = 'John' WHERE first_name = 'Jihn' to correct a typing error. Nothing could be simpler.

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