Database helper added.

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/source/limesurvey_ci@10086 b72ed6b6-b9f8-46b5-92b4-906544132732

application/helpers/database_helper.php

@@ -0,0 +1,232 @@
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+
+$CI =& get_instance(); 
+
+// Number fetch mode not supported by CI.
+/**
+function &db_execute_num($sql,$inputarr=false)
+{
+    global $connect;
+
+    $connect->SetFetchMode(ADODB_FETCH_NUM);
+    $dataset=$connect->Execute($sql,$inputarr);  //Checked
+    return $dataset;
+}
+
+function &db_select_limit_num($sql,$numrows=-1,$offset=-1,$inputarr=false)
+{
+    global $connect;
+
+    $connect->SetFetchMode(ADODB_FETCH_NUM);
+    $dataset=$connect->SelectLimit($sql,$numrows,$offset,$inputarr=false) or safe_die($sql);
+    return $dataset;
+}
+*/
+function &db_execute_assoc($sql,$inputarr=false,$silent=false)
+{
+    //global $connect;
+    global $CI;
+    //$connect->SetFetchMode(ADODB_FETCH_ASSOC);
+    if($inputarr)
+    {
+        $dataset=$CI->db->query($sql,$inputarr);    //Checked
+    }
+    else
+    {
+        $dataset=$CI->db->query($sql);
+    }
+
+    if (!$silent && !$dataset)  {safe_die('Error executing query in db_execute_assoc:'.$sql);}
+    return $dataset;
+}
+
+function &db_select_limit_assoc($sql,$numrows=0,$offset=0,$inputarr=false,$dieonerror=true)
+{
+    //global $connect;
+    global $CI;
+    //$connect->SetFetchMode(ADODB_FETCH_ASSOC);
+    if ($numrows)
+    {
+        if ($offset)
+        {
+            $CI->db->limit($numrows,$offset);
+        }
+        else
+        {
+            $CI->db->limit($numrows);
+        }
+    }
+    if($inputarr)
+    {
+        $dataset=$CI->db->query($sql,$inputarr);    //Checked
+    }
+    else
+    {
+        $dataset=$CI->db->query($sql);
+    }
+    if (!$dataset && $dieonerror) {safe_die('Error executing query in db_select_limit_assoc:'.$sql);}
+    return $dataset;
+}
+
+
+/**
+ * Returns the first row of values of the $sql query result
+ * as a 1-dimensional array
+ *
+ * @param mixed $sql
+ */
+function &db_select_column($sql)
+{
+    //global $connect;
+    global $CI;
+    //$connect->SetFetchMode(ADODB_FETCH_NUM);
+    $dataset=$CI->db->query($sql);
+    $fields = $dataset->list_fields();
+    $firstfield = $fields[0];
+    $resultarray=array();
+    if ($dataset->num_rows() > 0)
+    {
+        foreach ($dataset->result_array() as $row)
+        {
+            $resultarray[] = $row[$firstfield];
+        }
+        /**while ($row = $dataset->fetchRow()) {
+            $resultarray[]=$row[0];
+        }*/
+    }
+    else
+    safe_die('No results were returned from the query :'.$sql);
+    return $resultarray;
+}
+
+
+/**
+ * This functions quotes fieldnames accordingly
+ *
+ * @param mixed $id Fieldname to be quoted
+ */
+ /**
+function db_quote_id($id)
+{
+    global $databasetype;
+    // WE DONT HAVE nor USE other thing that alfanumeric characters in the field names
+    //  $quote = $connect->nameQuote;
+    //  return $quote.str_replace($quote,$quote.$quote,$id).$quote;
+
+    switch ($databasetype)
+    {
+        case "mysqli" :
+        case "mysql" :
+            return "`".$id."`";
+            break;
+        case "mssql_n" :
+        case "mssql" :
+		case "mssqlnative" :
+        case "odbc_mssql" :
+            return "[".$id."]";
+            break;
+        case "postgres":
+            return "\"".$id."\"";
+            break;
+        default:
+            return "`".$id."`";
+    }
+}
+*/
+function db_random()
+{
+    //global $connect,$databasetype;
+    global $CI;
+    if ($CI->db->dbdriver == 'odbc_mssql' || $CI->db->dbdriver == 'mssql_n' || $CI->db->dbdriver == 'odbtp')  {$srandom='NEWID()';}
+    else {$srandom= 0 + lcg_value()*(abs(1));}
+    return $srandom;
+
+}
+/**
+function db_quote($str,$ispostvar=false)
+// This functions escapes the string only inside
+{
+    global $connect;
+    if ($ispostvar) { return $connect->escape($str, get_magic_quotes_gpc());}
+    else {return $connect->escape($str);}
+}
+
+function db_quoteall($str,$ispostvar=false)
+// This functions escapes the string inside and puts quotes around the string according to the used db type
+// IF you are quoting a variable from a POST/GET then set $ispostvar to true so it doesnt get quoted twice.
+{
+    global $connect;
+    if ($ispostvar) { return $connect->qstr($str, get_magic_quotes_gpc());}
+    else {return $connect->qstr($str);}
+
+}
+
+function db_table_name($name)
+{
+    global $dbprefix;
+    return db_quote_id($dbprefix.$name);
+}
+*/
+/**
+ * returns the table name without quotes
+ *
+ * @param mixed $name
+ */
+ /**
+function db_table_name_nq($name)
+{
+    global $dbprefix;
+    return $dbprefix.$name;
+}
+*/
+/**
+ *  Return a sql statement for finding LIKE named tables
+ *  Be aware that you have to escape underscor chars by using a backslash 
+ * otherwise you might get table names returned you don't want
+ *
+ * @param mixed $table
+ */
+function db_select_tables_like($table)
+{
+    //global $databasetype;
+    global $CI;
+    switch ($CI->db->dbdriver) {
+        case 'mysqli':
+        case 'mysql' :
+            return "SHOW TABLES LIKE '$table'";
+        case 'odbtp' :
+        case 'mssql_n' :
+        case 'mssqlnative':
+        case 'odbc_mssql' :
+            return "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES where TABLE_TYPE='BASE TABLE' and TABLE_NAME LIKE '$table'";
+        case 'postgres' :
+            $table=str_replace('\\','\\\\',$table);
+            return "SELECT table_name FROM information_schema.tables WHERE table_schema = 'public' and table_name like '$table'";
+        default: safe_die ("Couldn't create 'select tables like' query for connection type 'databaseType'");
+    }
+}
+
+/**
+ *  Return a boolean stating if the table(s) exist(s)
+ *  Accepts '%' in names since it uses the 'like' statement
+ *
+ * @param mixed $table
+ */
+function db_tables_exist($table)
+{
+    global $CI;
+    return $CI->db->table_exists($table);
+    /**global $connect;
+
+    $surveyHasTokensTblQ = db_select_tables_like("$table");
+    $surveyHasTokensTblResult = db_execute_num($surveyHasTokensTblQ); //Checked
+
+    if ($surveyHasTokensTblResult->RecordCount() >= 1)
+    {
+        return TRUE;
+    }
+    else
+    {
+        return FALSE;
+    }*/
+}