- Patch #137479 by dww: added db_column_exits(). (Yay, the servers are snappy on Saturday evening.)

includes/database.mysql.inc

@@ -421,6 +421,13 @@ function db_table_exists($table) {
   return db_num_rows(db_query("SHOW TABLES LIKE '{". db_escape_table($table) ."}'"));
 }
 
+/**
+ * Check if a column exists in the given table.
+ */
+function db_column_exists($table, $column) {
+  return db_num_rows(db_query("SHOW COLUMNS FROM {%s} LIKE '%s'", $table, $column));
+}
+
 /**
  * Wraps the given table.field entry with a DISTINCT(). The wrapper is added to
  * the SELECT list entry of the given query and the resulting query is returned.

includes/database.mysqli.inc

@@ -401,6 +401,13 @@ function db_table_exists($table) {
   return db_num_rows(db_query("SHOW TABLES LIKE '{". db_escape_table($table) ."}'"));
 }
 
+/**
+ * Check if a column exists in the given table.
+ */
+function db_column_exists($table, $column) {
+  return db_num_rows(db_query("SHOW COLUMNS FROM {%s} LIKE '%s'", $table, $column));
+}
+
 /**
  * Wraps the given table.field entry with a DISTINCT(). The wrapper is added to
  * the SELECT list entry of the given query and the resulting query is returned.

includes/database.pgsql.inc

@@ -394,6 +394,13 @@ function db_table_exists($table) {
   return db_num_rows(db_query("SELECT relname FROM pg_class WHERE relname = '{". db_escape_table($table) ."}'"));
 }
 
+/**
+ * Check if a column exists in the given table.
+ */
+function db_column_exists($table, $column) {
+  return db_result(db_query("SELECT COUNT(pg_attribute.attname) FROM pg_class, pg_attribute WHERE pg_attribute.attrelid = pg_class.oid AND pg_class.relname = '{". db_escape_table($table) ."}' AND attname='%s'", $column));
+}
+
 /**
  * Verify if the database is set up correctly.
  */