Detaillierte Erläuterung der SQLite-PHP-Schnittstelle

Dieser Artikel vermittelt Ihnen hauptsächlich das Wissen über die SQLite-PHP-Schnittstelle und hofft, Ihnen dabei zu helfen. Werfen wir zunächst einen Blick auf das relevante Wissen über die PHP-Schnittstellen-API.

PHP-Schnittstellen-API

Mit Datenbank verbinden

<?php
   class MyDB extends SQLite3
   {
      function __construct()
      {
         $this->open(&#39;test.db&#39;);
      }
   }
   $db = new MyDB();
   if(!$db){
      echo $db->lastErrorMsg();
   } else {
      echo "Opened database successfully\n";
   }
?>

Tabelle erstellen

<?php
   class MyDB extends SQLite3
   {
      function __construct()
      {
         $this->open(&#39;test.db&#39;);
      }
   }
   $db = new MyDB();
   if(!$db){
      echo $db->lastErrorMsg();
   } else {
      echo "Opened database successfully\n";
   }

   $sql =<<<EOF
      CREATE TABLE COMPANY
      (ID INT PRIMARY KEY     NOT NULL,
      NAME           TEXT    NOT NULL,
      AGE            INT     NOT NULL,
      ADDRESS        CHAR(50),
      SALARY         REAL);
EOF;

   $ret = $db->exec($sql);
   if(!$ret){
      echo $db->lastErrorMsg();
   } else {
      echo "Table created successfully\n";
   }
   $db->close();
?>

INSERT-Operation

<?php
   class MyDB extends SQLite3
   {
      function __construct()
      {
         $this->open(&#39;test.db&#39;);
      }
   }
   $db = new MyDB();
   if(!$db){
      echo $db->lastErrorMsg();
   } else {
      echo "Opened database successfully\n";
   }

   $sql =<<<EOF
      INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (1, &#39;Paul&#39;, 32, &#39;California&#39;, 20000.00 );

      INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (2, &#39;Allen&#39;, 25, &#39;Texas&#39;, 15000.00 );

      INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (3, &#39;Teddy&#39;, 23, &#39;Norway&#39;, 20000.00 );

      INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (4, &#39;Mark&#39;, 25, &#39;Rich-Mond &#39;, 65000.00 );
EOF;

   $ret = $db->exec($sql);
   if(!$ret){
      echo $db->lastErrorMsg();
   } else {
      echo "Records created successfully\n";
   }
   $db->close();
?>

SELECT-Operation

<?php
   class MyDB extends SQLite3
   {
      function __construct()
      {
         $this->open(&#39;test.db&#39;);
      }
   }
   $db = new MyDB();
   if(!$db){
      echo $db->lastErrorMsg();
   } else {
      echo "Opened database successfully\n";
   }

   $sql =<<<EOF
      SELECT * from COMPANY;
EOF;

   $ret = $db->query($sql);
   while($row = $ret->fetchArray(SQLITE3_ASSOC) ){
      echo "ID = ". $row[&#39;ID&#39;] . "\n";
      echo "NAME = ". $row[&#39;NAME&#39;] ."\n";
      echo "ADDRESS = ". $row[&#39;ADDRESS&#39;] ."\n";
      echo "SALARY =  ".$row[&#39;SALARY&#39;] ."\n\n";
   }
   echo "Operation done successfully\n";
   $db->close();
?>

UPDATE-Operation

<?php
   class MyDB extends SQLite3
   {
      function __construct()
      {
         $this->open(&#39;test.db&#39;);
      }
   }
   $db = new MyDB();
   if(!$db){
      echo $db->lastErrorMsg();
   } else {
      echo "Opened database successfully\n";
   }
   $sql =<<<EOF
      UPDATE COMPANY set SALARY = 25000.00 where ID=1;
EOF;
   $ret = $db->exec($sql);
   if(!$ret){
      echo $db->lastErrorMsg();
   } else {
      echo $db->changes(), " Record updated successfully\n";
   }

   $sql =<<<EOF
      SELECT * from COMPANY;
EOF;
   $ret = $db->query($sql);
   while($row = $ret->fetchArray(SQLITE3_ASSOC) ){
      echo "ID = ". $row[&#39;ID&#39;] . "\n";
      echo "NAME = ". $row[&#39;NAME&#39;] ."\n";
      echo "ADDRESS = ". $row[&#39;ADDRESS&#39;] ."\n";
      echo "SALARY =  ".$row[&#39;SALARY&#39;] ."\n\n";
   }
   echo "Operation done successfully\n";
   $db->close();
?>

DELETE-Operation

<?php
   class MyDB extends SQLite3
   {
      function __construct()
      {
         $this->open(&#39;test.db&#39;);
      }
   }
   $db = new MyDB();
   if(!$db){
      echo $db->lastErrorMsg();
   } else {
      echo "Opened database successfully\n";
   }
   $sql =<<<EOF
      DELETE from COMPANY where ID=2;
EOF;
   $ret = $db->exec($sql);
   if(!$ret){
     echo $db->lastErrorMsg();
   } else {
      echo $db->changes(), " Record deleted successfully\n";
   }

   $sql =<<<EOF
      SELECT * from COMPANY;
EOF;
   $ret = $db->query($sql);
   while($row = $ret->fetchArray(SQLITE3_ASSOC) ){
      echo "ID = ". $row[&#39;ID&#39;] . "\n";
      echo "NAME = ". $row[&#39;NAME&#39;] ."\n";
      echo "ADDRESS = ". $row[&#39;ADDRESS&#39;] ."\n";
      echo "SALARY =  ".$row[&#39;SALARY&#39;] ."\n\n";
   }
   echo "Operation done successfully\n";
   $db->close();
?>

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