Tim (PaulT commit): ConnectDB_xxxx.inc files: Add function DB_table_e…

…xists() function to all DB support files, by Tim suggestion. Note that this function will be used in other files in a future commit.

Signed-off-by: Paul Thursby <pthursby2@gmail.com>

doc/Change.log

@@ -1,5 +1,6 @@
 webERP Change Log
 
+9/2/18   Tim (PaulT commit): ConnectDB_xxxx.inc files: Add function DB_table_exists() function to all DB support files, by Tim suggestion. Note that this function will be used in other files in a future commit.
 7/2/18   Paul Becker (PaulT commit): Z_SalesIntegrityCheck.php: Fix that the does not take into account discountpercent so it shows an issue where non exists. (Reported in forums: http://www.weberp.org/forum/showthread.php?tid=8084) 
 7/2/18   Tim (PaulT commit) UserSettings.php: Fix the 'Maximum Number of Records to Display' from populating with the session default at page load instead of the user's setting. Applied Tim's improved handling. (Reported in forums by Paul Becker: http://www.weberp.org/forum/showthread.php?tid=8081) 
 6/2/18   geo_displaymap_customers.php, geo_displaymap_suppliers.php: Fix a few PHP short-tags, and move some javascript from PHP output to fix 'missing tag' validation complaints.

includes/ConnectDB_mysql.inc

@@ -209,4 +209,16 @@ function DB_ReinstateForeignKeys() {
 	mysql_query('SET FOREIGN_KEY_CHECKS=1',$db);
 }
 
+function DB_table_exists($TableName) {
+	global $db;
+
+	$SQL = "SELECT TABLE_NAME FROM information_schema.tables WHERE TABLE_SCHEMA = '" . $_SESSION['DatabaseName'] . "' AND TABLE_NAME = '" . $TableName . "'";
+	$Result = DB_query($SQL);
+
+	if (DB_num_rows($Result) > 0) {
+		return True;
+	} else {
+		return False;
+	}
+}
 ?>

includes/ConnectDB_mysqli.inc

@@ -224,4 +224,17 @@ function DB_ReinstateForeignKeys() {
 	global $db;
 	mysqli_query($db, 'SET FOREIGN_KEY_CHECKS=1');
 }
+
+function DB_table_exists($TableName) {
+	global $db;
+
+	$SQL = "SELECT TABLE_NAME FROM information_schema.tables WHERE TABLE_SCHEMA = '" . $_SESSION['DatabaseName'] . "' AND TABLE_NAME = '" . $TableName . "'";
+	$Result = DB_query($SQL);
+
+	if (DB_num_rows($Result) > 0) {
+		return True;
+	} else {
+		return False;
+	}
+}
 ?>

includes/ConnectDB_postgres.inc

@@ -149,4 +149,16 @@ function DB_Maintenance() {
 				WHERE confname = 'DB_Maintenance_LastRun'");
 }
 
+function DB_table_exists($TableName) {
+	global $db;
+
+	$SQL = "SELECT TABLE_NAME FROM information_schema.tables WHERE TABLE_SCHEMA = '" . $_SESSION['DatabaseName'] . "' AND TABLE_NAME = '" . $TableName . "'";
+	$Result = DB_query($SQL);
+
+	if (DB_num_rows($Result) > 0) {
+		return True;
+	} else {
+		return False;
+	}
+}
 ?>