thinkphp3.1 can't even connect to MySQL database please help

thinkphp3.1 can't even get a MySQL database. Please help me with the shrimp.
Thinkphp 3.1 can't even get a MySQL database please help me!!!

Project configuration file config.php:

Return Array (
' App_status ' = ' Debug ',
' Db_type ' = ' mysql ',//database type
' db_host ' = ' localhost ',//server address
' Db_name ' = ' thinkphp ',//database name
' Db_user ' = ' root ',//user name
' Db_pwd ' = ' 123456 ',//password
' Db_port ' = ' 3306 ',//Port
' Db_prefix ' = ' think_ ',//database table prefix
' Db_fieldtype_check ' = false,//whether field type checking is performed
' Db_fields_cache ' = = true,//enable field caching
' Db_charset ' = ' gb2312 ',//Database encoding defaults to UTF8
' Db_deploy_type ' + 0,//Database deployment method: 0 Centralized (single server), 1 distributed (Master-slave server)

' Db_rw_separate ' = false,//database read/write is separate master-slave valid
' Db_master_num ' + 1,//read/write separation of the number of servers
' Db_slave_no ' + ',//Specify the number from the server
' Db_sql_build_cache ' = false,//database query SQL Create cache
' Db_sql_build_queue ' + ' file ',//SQL cache queue cache mode support for file XCache and APC
' Db_sql_build_length ' =////SQL Cache Queue Length
' Db_sql_log ' = false,//SQL execution logging

);
?>

MySQL has a thinkphp database, THINK_ABC table with ID int primary key auto_increment,name varchar (), Age int,sex bool Field

Controller file IndexAction.class.php:

Class Indexaction extends Action {
Public Function index () {
$data =array (
' Name ' = ' dong ',
' Age ' =>21,
' Sex ' =>1
);
M (' ABC ')->add ($data);
}
}
?>

Browser display ' page error after browser input http://localhost/app/index.php, please try again later ' http://localhost/app/index.php/index/also tried ha In this case, the definition of other non-connected MySQL functions to run normal I have no way for beginners to get the expert guidance

------Solution--------------------
Delete the Runtime directory under the app and try again!

If you still can't, please call

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