Postgresql DB 简单操作类

只用来执行SQL的 其它的不懂

//使用

define(&＃39;DB_NAME&＃39;, &＃39;aaaa&＃39;);// 数据库名
define(&＃39;DB_USER&＃39;, &＃39;root&＃39;);// 数据库用户
define(&＃39;DB_PASSWORD&＃39;, &＃39;123456&＃39;);//数据库密码
define(&＃39;DB_HOST&＃39;, &＃39;localhost&＃39;);// 服务器名或服务器ip,一般为localhost
define(&＃39;DB_CHARSET&＃39;, &＃39;utf8&＃39;);//PostgreSQL编码设置.如果您的程序出现乱码现象，需要设置此项来修复. 请不要随意更改此项，否则将可能导致系统出现乱码现象
define(&＃39;DB_PREFIX&＃39;, &＃39;icms_&＃39;);// 表名前缀, 同一数据库安装多个请修改此处
define(&＃39;DB_PREFIX_TAG&＃39;, &＃39;#iCMS@__&＃39;);// SQL表名前缀替换


iDB::query(sql);
iDB::getValue(sql);
iDB::getRow(sql);
iDB::getArray(sql);

1.iPgsql.class.php

* @site http://www.iiiphp.com
* @licence http://www.iiiphp.com/license
* @version 1.0.1
* @package iDB
* @$Id: iPgsql.class.php 44 2012-03-30 04:02:10Z coolmoo $
*/
define(&＃39;DB_PORT&＃39;, 5432);
define(&＃39;OBJECT&＃39;, &＃39;OBJECT&＃39;, true);
define(&＃39;ARRAY_A&＃39;, &＃39;ARRAY_A&＃39;, false);
define(&＃39;ARRAY_N&＃39;, &＃39;ARRAY_N&＃39;, false);
 
defined(&＃39;SAVEQUERIES&＃39;) OR define(&＃39;SAVEQUERIES&＃39;, true);
 
class iDB{
    public static $show_errors = false;
    public static $num_queries = 0;
    public static $last_query;
    public static $col_info;
    public static $queries;
    public static $func_call;
    public static $last_result;
    public static $num_rows;
    public static $insert_id;
 
    private static $collate;
    private static $time_start;
    private static $last_error ;
    private static $dbh;
    private static $result;
 
    function __construct() {
        if (!self::$dbh)
            self::connect();
    }
    function connect() {
        extension_loaded(&＃39;pgsql&＃39;) OR die(&＃39;您的 PHP 安装看起来缺少 PostgreSQL 数据库部分，
        这对 iPHP 来说是必须的。&＃39;);
         
        defined(&＃39;DB_COLLATE&＃39;) && self::$collate = DB_COLLATE;
 
        self::$dbh = pg_connect("host=".DB_HOST." port=".DB_PORT." dbname=".DB_NAME.
        " user=".DB_USER." password=".DB_PASSWORD);
 
        defined(&＃39;DB_CHARSET&＃39;) && self::query("set client_encoding to &＃39;".DB_CHARSET."&＃39;");
 
        self::$dbh OR self::bail("
数据库链接失败
        
请检查 config.php 的配置是否正确!

        
请确认主机支持PostgreSQL?
请确认用户名和密码正确?
        
请确认主机名正确?(一般为localhost)
如果你不确定这些情况,请询问你的主机提供商.
        如果你还需要帮助你可以随时浏览 iPHP 支持论坛.
");
        //@mysql_select_db(DB_NAME, self::$dbh) OR self::bail("
        
链接到".DB_NAME."数据库失败
我们能连接到数据库服务器（即数据库用户名和密码正确） ，但是不能链接到$db数据库.
你确定$db存在?
如果你不确定这些情况,请询问你的主机提供商.如果你还需要帮助你可以随时浏览 
iPHP 支持论坛.
");
 
    }
    // ==================================================================
    //  Print SQL/DB error.
 
    function print_error($str = &＃39;&＃39;) {
        if (!$str)
            $str = pg_result_error(self::$dbh);
 
        $EZSQL_ERROR[]  = array (&＃39;query&＃39; => self::$last_query, &＃39;error_str&＃39; => $str);
 
        $str    = htmlspecialchars($str, ENT_QUOTES);
        $query  = htmlspecialchars(self::$last_query, ENT_QUOTES);
        // Is error output turned on or not..
        if ( self::$show_errors ) {
            // If there is an error then take note of it
            die("

            
iPHP database error: [$str]

            $query
            
");
        } else {
            return false;
        }
    }
    // ==================================================================
    //  Kill cached query results
 
    function flush() {
        self::$last_result  = array();
        self::$col_info     = null;
        self::$last_query   = null;
    }
 
    // ==================================================================
    //  Basic Query - see docs for more detail
 
    function query($query,$QT=NULL) {
        if (!self::$dbh) {
            self::connect();
        }
        // filter the query, if filters are available
        // NOTE: some queries are made before the plugins have been loaded, 
        and thus cannot be filtered with this method
        $query=str_replace(DB_PREFIX_TAG,DB_PREFIX, $query);
 
        // initialise return
        $return_val = 0;
        self::flush();
 
        // Log how the function was called
        self::$func_call = __CLASS__."::query(\"$query\")";
 
        // Keep track of the last query for debug..
        self::$last_query = $query;
 
        // Perform the query via std pgsql_query function..
        if (SAVEQUERIES) self::timer_start();
 
        self::$result = pg_query(self::$dbh,$query);
         
 
        self::$num_queries++;
 
        if (SAVEQUERIES) self::$queries[] = array( $query, self::timer_stop());
 
        // If there is an error then take note of it..
        if ( self::$last_error = pg_result_error(self::$result) ) {
            self::print_error();
            return false;
        }
        $QH = strtoupper(substr($query,0,strpos($query, &＃39; &＃39;)));
        if (in_array($QH,array("INSERT","DELETE","UPDATE","REPLACE"))) {
            $rows_affected = pg_affected_rows (self::$result);
            // Take note of the insert_id
            if (in_array($QH,array("INSERT","REPLACE"))) {
                self::$insert_id = pg_last_oid(self::$result);
            }
            // Return number of rows affected
            $return_val = $rows_affected;
        } else {
            if($QT=="field") {
                $i = 0;
                while ($i  value relationships. 
      Multiple member pairs will be joined with ANDs.  
      WARNING: the column names are not currently sanitized!
     * @return mixed results of self::query()
     */
    function update($table, $data, $where) {
//      $data = add_magic_quotes($data);
        $bits = $wheres = array();
        foreach ( array_keys($data) as $k )
            $bits[] = "`$k` = &＃39;$data[$k]&＃39;";
 
        if ( is_array( $where ) )
            foreach ( $where as $c => $v )
                $wheres[] = "$c = &＃39;" . addslashes( $v ) . "&＃39;";
        else
            return false;
        return self::query("UPDATE ".DB_PREFIX_TAG."{$table} SET " 
        . implode( &＃39;, &＃39;, $bits ) . &＃39; WHERE &＃39; . 
        implode( &＃39; AND &＃39;, $wheres ) . &＃39; LIMIT 1&＃39; );
    }
    /**
     * Get one variable from the database
     * @param string $query (can be null as well, for caching, see codex)
     * @param int $x = 0 row num to return
     * @param int $y = 0 col num to return
     * @return mixed results
     */
    function getValue($query=null, $x = 0, $y = 0) {
        self::$func_call = __CLASS__."::getValue(\"$query\",$x,$y)";
        if ( $query )
            self::query($query);
 
        // Extract var out of cached results based x,y vals
        if ( !empty( self::$last_result[$y] ) ) {
            $values = array_values(get_object_vars(self::$last_result[$y]));
        }
        // If there is a value return it else return null
        return (isset($values[$x]) && $values[$x]!==&＃39;&＃39;) ? $values[$x] : null;
    }
 
    /**
     * Get one row from the database
     * @param string $query
     * @param string $output ARRAY_A | ARRAY_N | OBJECT
     * @param int $y row num to return
     * @return mixed results
     */
    function getRow($query = null, $output = OBJECT, $y = 0) {
        self::$func_call = __CLASS__."::getRow(\"$query\",$output,$y)";
        if ( $query )
            self::query($query);
 
        if ( !isset(self::$last_result[$y]) )
            return null;
 
        if ( $output == OBJECT ) {
            return self::$last_result[$y] ? self::$last_result[$y] : null;
        } elseif ( $output == ARRAY_A ) {
            return self::$last_result[$y] ? get_object_vars(self::$last_result[$y]) : null;
        } elseif ( $output == ARRAY_N ) {
            return self::$last_result[$y] 
            ? array_values(get_object_vars(self::$last_result[$y])) : null;
        } else {
            self::print_error(__CLASS__."::getRow(string query, output type, int offset) 
            -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N");
        }
    }
 
    /**
     * Return an entire result set from the database
     * @param string $query (can also be null to pull from the cache)
     * @param string $output ARRAY_A | ARRAY_N | OBJECT
     * @return mixed results
     */
    function getArray($query = null, $output = ARRAY_A) {
        self::$func_call = __CLASS__."::getArray(\"$query\", $output)";
 
        if ( $query )
            self::query($query);
 
        // Send back array of objects. Each row is an object
        if ( $output == OBJECT ) {
            return self::$last_result;
        } elseif ( $output == ARRAY_A || $output == ARRAY_N ) {
            if ( self::$last_result ) {
                $i = 0;
                foreach( (array) self::$last_result as $row ) {
                    if ( $output == ARRAY_N ) {
                        // ...integer-keyed row arrays
                        $new_array[$i] = array_values( get_object_vars( $row ) );
                    } else {
                        // ...column name-keyed row arrays
                        $new_array[$i] = get_object_vars( $row );
                    }
                    ++$i;
                }
                return $new_array;
            } else {
                return null;
            }
        }
    }
 
    /**
     * Gets one column from the database
     * @param string $query (can be null as well, for caching, see codex)
     * @param int $x col num to return
     * @return array results
     */
    function getCol($query = null , $x = 0) {
        if ( $query )
            self::query($query);
 
        $new_array = array();
        // Extract the column values
        for ( $i=0; $i {$info_type};
                    $i++;
                }
                return $new_array;
            } else {
                return self::$col_info[$col_offset]->{$info_type};
            }
        }
    }
    function version() {
        // Make sure the server has PostgreSQL 4.0
        $v = pg_version(self::$dbh);
        return $v[&＃39;client&＃39;];
    }
 
    /**
     * Starts the timer, for debugging purposes
     */
    function timer_start() {
        $mtime = microtime();
        $mtime = explode(&＃39; &＃39;, $mtime);
        self::$time_start = $mtime[1] + $mtime[0];
        return true;
    }
 
    /**
     * Stops the debugging timer
     * @return int total time spent on the query, in milliseconds
     */
    function timer_stop() {
        $mtime = microtime();
        $mtime = explode(&＃39; &＃39;, $mtime);
        $time_end = $mtime[1] + $mtime[0];
        $time_total = $time_end - self::$time_start;
        return $time_total;
    }
 
    /**
     * Wraps fatal errors in a nice header and footer and dies.
     * @param string $message
     */
    function bail($message){ // Just wraps errors in a nice header and footer
        if ( !self::$show_errors ) {
            return false;
        }
        header(&＃39;Content-Type: text/html; charset=utf8&＃39;);
        echo &＃39;
        
        
     

        
&＃39;.$message.&＃39;
&＃39;;
        exit();
    }
}

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