From: mark burdett <mfburdett@gmail.com>
Date: Wed, 20 Feb 2019 00:46:46 +0000 (-0800)
Subject: Provide API for creating TEMPORARY MEMORY tables.
X-Git-Url: https://vcs.fsf.org/?a=commitdiff_plain;h=8ccee4bf13394f5a8ba88d5fc146596ba58ec4c9;p=civicrm-core.git

Provide API for creating TEMPORARY MEMORY tables.
---

diff --git a/CRM/Utils/SQL/TempTable.php b/CRM/Utils/SQL/TempTable.php
index cfcdbac514..cde12a0f67 100644
--- a/CRM/Utils/SQL/TempTable.php
+++ b/CRM/Utils/SQL/TempTable.php
@@ -72,6 +72,8 @@ class CRM_Utils_SQL_TempTable {
   const CATEGORY_REGEXP = ';^[a-zA-Z0-9]+$;';
   const ID_LENGTH = 37; // MAX{64} - CATEGORY_LENGTH{12} - CONST_LENGHTH{15} = 37
   const ID_REGEXP = ';^[a-zA-Z0-9_]+$;';
+  const INNODB = 'ENGINE=InnoDB';
+  const MEMORY = 'ENGINE=MEMORY';
 
   /**
    * @var bool
@@ -84,6 +86,8 @@ class CRM_Utils_SQL_TempTable {
 
   protected $autodrop;
 
+  protected $memory;
+
   /**
    * @return CRM_Utils_SQL_TempTable
    */
@@ -96,6 +100,7 @@ class CRM_Utils_SQL_TempTable {
     // I suspect it would be better to just say utf8=true, but a lot of existing queries don't do the utf8 bit.
     $t->utf8 = CRM_Utils_Constant::value('CIVICRM_TEMP_FORCE_UTF8', FALSE);
     $t->autodrop = FALSE;
+    $t->memory = FALSE;
     return $t;
   }
 
@@ -126,8 +131,9 @@ class CRM_Utils_SQL_TempTable {
    * @return CRM_Utils_SQL_TempTable
    */
   public function createWithQuery($selectQuery) {
-    $sql = sprintf('%s %s AS %s',
+    $sql = sprintf('%s %s %s AS %s',
       $this->toSQL('CREATE'),
+      $this->memory ? self::MEMORY : self::INNODB,
       $this->utf8 ? self::UTF8 : '',
       ($selectQuery instanceof CRM_Utils_SQL_Select ? $selectQuery->toSQL() : $selectQuery)
     );
@@ -144,9 +150,10 @@ class CRM_Utils_SQL_TempTable {
    * @return CRM_Utils_SQL_TempTable
    */
   public function createWithColumns($columns) {
-    $sql = sprintf('%s (%s) %s',
+    $sql = sprintf('%s (%s) %s %s',
       $this->toSQL('CREATE'),
       $columns,
+      $this->memory ? self::MEMORY : self::INNODB,
       $this->utf8 ? self::UTF8 : ''
     );
     CRM_Core_DAO::executeQuery($sql, array(), TRUE, NULL, TRUE, FALSE);
@@ -215,6 +222,13 @@ class CRM_Utils_SQL_TempTable {
     return $this->durable;
   }
 
+  /**
+   * @return bool
+   */
+  public function isMemory() {
+    return $this->memory;
+  }
+
   /**
    * @return bool
    */
@@ -273,6 +287,18 @@ class CRM_Utils_SQL_TempTable {
     return $this;
   }
 
+  /**
+   * Set table engine to MEMORY.
+   *
+   * @param bool $value
+   *
+   * @return $this
+   */
+  public function setMemory($value = TRUE) {
+    $this->memory = $value;
+    return $this;
+  }
+
   /**
    * Set table collation to UTF8.
    *