Php Sql Result Error
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this mysqli_query error site About Us Learn more about Stack Overflow the company Business Learn die(mysql_error()) more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question i cannot select mysql database x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up how http://php.net/manual/en/mysqli.error.php to display MySql error in php up vote 14 down vote favorite In PHP, I am trying to execute a long MySql query that depends on the user input. However, my query fails with the following message, "Query Failed". Actually I have printed this message whenever the query fails but I am having hard time looking for the reason behind this failure. Unfortunately, I http://stackoverflow.com/questions/12227626/how-to-display-mysql-error-in-php couldn't find it because the error is not specified on the web page. My question is, is there any way to display the error message that caused the failure on the web page. Thank you. Here's my code, $from= "Findings"; $where=""; if($service!= null) { $from = $from . ", ServiceType_Lookup"; $where= "Findings.ServiceType_ID= ServiceType_Lookup.ServiceType_ID AND ServiceType_Name= ". $service; if($keyword!= null) $where= $where . " AND "; } if( $keyword != null) { $where= $where . "Finding_ID LIKE '%$keyword%' OR ServiceType_ID LIKE '%$keyword%' OR Title LIKE '%$keyword%' OR RootCause_ID LIKE '%$keyword%' OR RiskRating_ID LIKE '%$keyword%' OR Impact_ID LIKE '%$keyword%' OR Efforts_ID LIKE '%$keyword%' OR Likelihood_ID LIKE '%$keyword%' OR Finding LIKE '%$keyword%' OR Implication LIKE '%$keyword%' OR Recommendation LIKE '%$keyword%' OR Report_ID LIKE '%$keyword%'"; } $query = "SELECT Finding_ID, ServiceType_ID, Title, RootCause_ID, RiskRating_ID, Impact_ID, Efforts_ID, Likelihood_ID, Finding, Implication, Recommendation, Report_ID FROM ".$from . " WHERE " . $where; echo "wala 2eshiq"; $this->result = $this->db_link->query($query); if (!$this->result) { printf("Query failed: %s\n", mysqli_connect_error()); exit; } $r = mysqli_query($this->db_link, $query); if($r==false) printf("error: %s\n", mysqli_errno($this->db_link)); php mysql share|improve this question asked Sep 1 '12 at 12:16 Traveling Salesman 56131640 You can just use: $this->db
the new WordPress Code Reference! Class Reference/wpdb Languages: English • Italiano • 日本語 • Русский • 中文(繁體) • 한국어 • (Add your language) Contents 1 Talking to the Database: The wpdb Class 1.1 Using the $wpdb Object 1.2 A Warning 2 SELECT a Variable 2.1 https://codex.wordpress.org/Class_Reference/wpdb Examples 3 SELECT a Row 3.1 Examples 4 SELECT a Column 4.1 Examples 5 SELECT http://wiki.hashphp.org/PDO_Tutorial_for_MySQL_Developers Generic Results 5.1 Examples 6 INSERT row 6.1 Examples 7 REPLACE row 7.1 Examples 8 UPDATE rows 8.1 Examples 9 DELETE Rows 9.1 Usage 9.2 Parameters 9.3 Examples 10 Running General Queries 10.1 General Syntax 10.2 Examples 11 Protect Queries Against SQL Injection Attacks 11.1 Placeholders 11.2 Examples 12 Show and Hide SQL Errors 13 Getting Column Information 14 Clearing mysql error the Cache 15 Class Variables 15.1 Multi-Site Variables 16 Tables 16.1 Multisite Tables 17 Source File 18 Related 18.1 Articles 18.2 Code Documentation Talking to the Database: The wpdb Class WordPress defines a class called wpdb, which contains a set of functions used to interact with a database. Its primary purpose is to provide an interface with the WordPress database, but can be used to communicate with any other appropriate database. The class source php sql result code is loosely based on the ezSQL class; written and maintained by Justin Vincent Using the $wpdb Object Warning: Methods in the wpdb() class should not be called directly. Use the global $wpdb object instead! WordPress provides a global object variable, $wpdb, which is an instantiation of the wpdb class defined in /wp-includes/wp-db.php. By default, $wpdb is instantiated to talk to the WordPress database. To access $wpdb in your WordPress PHP code, declare $wpdb as a global variable using the global keyword, or use the superglobal $GLOBALS in the following manner:
// 1st Method - Declaring $wpdb as global and using it to execute an SQL query statement that returns a PHP object global $wpdb; $results = $wpdb->get_results( 'SELECT * FROM wp_options WHERE option_id = 1', OBJECT ); // 2nd Method - Utilizing the $GLOBALS superglobal. Does not require global keyword ( but may not be best practice ) $results = $GLOBALS['wpdb']->get_results( 'SELECT * FROM wp_options WHERE option_id = 1', OBJECT );
The $wpdb object is not limited to the default tables created by WordPress; it can be used to read data from any table in the WordPress database (such as custom plugin tables). For example to SELECT some information from a custom table called "mytable", you can do the following.
$myrows = $wpdb->