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pg_send_query

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pg_send_query

(PHP 4 >= 4.2.0, PHP 5)

pg_send_query 发送异步查询

说明

bool pg_send_query ( resource $connection , string $query ) bool pg_send_query ( string $query )

pg_send_query()connection 连接发送异步查询。和 pg_query() 不同,它可以向 PostgreSQL 发送多个查询并用 pg_get_result() 依次得到结果。当执行查询时脚本的执行不会被锁定。用 pg_connection_busy() 来检查连接连接是否为忙(即查询正在执行中)。调用 pg_cancel_query() 则有可能取消查询。

尽管用户可以一次发送多个查询,但用户不能通过正忙的连接发送多个查询。如果向正忙的连接发送了查询,则会等待上一条查询结束并丢弃所有结果。

Example #1 异步查询

<?php
    $dbconn 
pg_connect("dbname=publisher") or die("Could not connect");
    if (!
pg_connection_busy($dbconn)) {
        
pg_send_query($dbconn,"select * from authors; select count(*) from authors;");
    }
    
$res1 pg_get_result($dbconn);
    echo 
"First call to pg_get_result(): $res1 ";
    
$rows1 pg_num_rows($res1);
    echo 
"$res1 has $rows1 records ";
    
$res2 pg_get_result($dbconn);
    echo 
"second call to pg_get_result(): $res2 ";
    
$rows2 pg_num_rows($res2);
    echo 
"$res2 has $rows2 records ";
?>

上例输出如下:

first call to pg_get_result(): Resource id #3
Resource id #3 has 3 records

second call to pg_get_result(): Resource id #4
Resource id #4 has 1 records

参见 pg_query()pg_cancel_query()pg_get_result()pg_connection_busy()


  • pg_affected_rows
  • pg_cancel_query
  • pg_client_encoding
  • pg_close
  • pg_connect
  • pg_connection_busy
  • pg_connection_reset
  • pg_connection_status
  • pg_convert
  • pg_copy_from
  • pg_copy_to
  • pg_dbname
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  • pg_escape_bytea
  • pg_escape_identifier
  • pg_escape_literal
  • pg_escape_string
  • pg_execute
  • pg_fetch_all
  • pg_fetch_all_columns
  • pg_fetch_array
  • pg_fetch_assoc
  • pg_fetch_object
  • pg_fetch_result
  • pg_fetch_row
  • pg_field_is_null
  • pg_field_name
  • pg_field_num
  • pg_field_prtlen
  • pg_field_size
  • pg_field_table
  • pg_field_type
  • pg_field_type_oid
  • pg_free_result
  • pg_get_notify
  • pg_get_pid
  • pg_get_result
  • pg_host
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  • pg_last_error
  • pg_last_notice
  • pg_last_oid
  • pg_lo_close
  • pg_lo_create
  • pg_lo_export
  • pg_lo_import
  • pg_lo_open
  • pg_lo_read
  • pg_lo_read_all
  • pg_lo_seek
  • pg_lo_tell
  • pg_lo_unlink
  • pg_lo_write
  • pg_meta_data
  • pg_num_fields
  • pg_num_rows
  • pg_options
  • pg_parameter_status
  • pg_pconnect
  • pg_ping
  • pg_port
  • pg_prepare
  • pg_put_line
  • pg_query
  • pg_query_params
  • pg_result_error
  • pg_result_error_field
  • pg_result_seek
  • pg_result_status
  • pg_select
  • pg_send_execute
  • pg_send_prepare
  • pg_send_query
  • pg_send_query_params
  • pg_set_client_encoding
  • pg_set_error_verbosity
  • pg_trace
  • pg_transaction_status
  • pg_tty
  • pg_unescape_bytea
  • pg_untrace
  • pg_update
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