PostgreSQL 常用函数

http://PHP.net/manual/zh/ref.pgsql.PHP

注释

Note:

Not all functions are supported by all builds. It depends on your libpq (The Postgresql C client library) version and how libpq is compiled. If PHP Postgresql extensions are missing,then it is because your libpq version does not support them.

Note:

Most Postgresql functions acceptconnectionas the optional first parameter. If it is not provided,the last opened connection is used. If it doesn't exist,functions returnFALSE.

Note:

Postgresql automatically folds all identifiers (e.g. table/column names) to lower-case values at object creation time and at query time. To force the use of mixed or upper case identifiers,you must escape the identifier using double quotes ("").

Note:

Postgresql does not have special commands for fetching database schema information (eg. all the tables in the current database). Instead,there is a standard schema namedinformation_schemain Postgresql 7.4 and above containing system views with all the necessary information,in an easily queryable form. See the»PostgreSQL Documentationfor full details.

Table of Contents

• pg_affected_rows— 返回受影响的记录数目
• pg_cancel_query— 取消异步查询
• pg_client_encoding— 取得客户端编码方式
• pg_close— 关闭一个 Postgresql 连接
• pg_connect— 打开一个 Postgresql 连接
• pg_connection_busy— 获知连接是否为忙
• pg_connection_reset— 重置连接（再次连接）
• pg_connection_status— 获得连接状态
• pg_convert— 将关联的数组值转换为适合 sql 语句的格式。
• pg_copy_from— 根据数组将记录插入表中
• pg_copy_to— 将一个表拷贝到数组中
• pg_dbname— 获得数据库名
• pg_delete— 删除记录
• pg_end_copy— 与 Postgresql 后端同步
• pg_escape_bytea— 转义 bytea 类型的二进制数据
• pg_escape_identifier— Escape a identifier for insertion into a text field
• pg_escape_literal— Escape a literal for insertion into a text field
• pg_escape_string— 转义 text/char 类型的字符串
• pg_execute— Sends a request to execute a prepared statement with given parameters,and waits for the result.
• pg_fetch_all_columns— Fetches all rows in a particular result column as an array
• pg_fetch_all— 从结果中提取所有行作为一个数组
• pg_fetch_array— 提取一行作为数组
• pg_fetch_assoc— 提取一行作为关联数组
• pg_fetch_object— 提取一行作为对象
• pg_fetch_result— 从结果资源中返回值
• pg_fetch_row— 提取一行作为枚举数组
• pg_field_is_null— 测试字段是否为 NULL
• pg_field_name— 返回字段的名字
• pg_field_num— 返回字段的编号
• pg_field_prtlen— 返回打印出来的长度
• pg_field_size— 返回指定字段占用内部存储空间的大小
• pg_field_table— Returns the name or oid of the tables field
• pg_field_type_oid— Returns the type ID (OID) for the corresponding field number
• pg_field_type— 返回相应字段的类型名称
• pg_free_result— 释放查询结果占用的内存
• pg_get_notify— Ping 数据库连接
• pg_get_pid— Ping 数据库连接
• pg_get_result— 取得异步查询结果
• pg_host— 返回和某连接关联的主机名
• pg_insert— 将数组插入到表中
• pg_last_error— 得到某连接的最后一条错误信息
• pg_last_notice— 返回 Postgresql 服务器最新一条公告信息
• pg_last_oid— 返回上一个对象的 oid
• pg_lo_close— 关闭一个大型对象
• pg_lo_create— 新建一个大型对象
• pg_lo_export— 将大型对象导出到文件
• pg_lo_import— 将文件导入为大型对象
• pg_lo_open— 打开一个大型对象
• pg_lo_read_all— 读入整个大型对象并直接发送给浏览器
• pg_lo_read— 从大型对象中读入数据
• pg_lo_seek— 移动大型对象中的指针
• pg_lo_tell— 返回大型对象的当前指针位置
• pg_lo_unlink— 删除一个大型对象
• pg_lo_write— 向大型对象写入数据
• pg_meta_data— 获得表的元数据
• pg_num_fields— 返回字段的数目
• pg_num_rows— 返回行的数目
• pg_options— 获得和连接有关的选项
• pg_parameter_status— Looks up a current parameter setting of the server.
• pg_pconnect— 打开一个持久的 Postgresql 连接
• pg_ping— Ping 数据库连接
• pg_port— 返回该连接的端口号
• pg_prepare— Submits a request to create a prepared statement with the given parameters,and waits for completion.
• pg_put_line— 向 Postgresql 后端发送以 NULL 结尾的字符串
• pg_query_params— Submits a command to the server and waits for the result,with the ability to pass parameters separately from the sql command text.
• pg_query— 执行查询
• pg_result_error_field— Returns an individual field of an error report.
• pg_result_error— 获得查询结果的错误信息
• pg_result_seek— 在结果资源中设定内部行偏移量
• pg_result_status— 获得查询结果的状态
• pg_select— 选择记录
• pg_send_execute— Sends a request to execute a prepared statement with given parameters,without waiting for the result(s).
• pg_send_prepare— Sends a request to create a prepared statement with the given parameters,without waiting for completion.
• pg_send_query_params— Submits a command and separate parameters to the server without waiting for the result(s).
• pg_send_query— 发送异步查询
• pg_set_client_encoding— 设定客户端编码
• pg_set_error_verbosity— Determines the verbosity of messages returned by pg_last_error and pg_result_error.
• pg_trace— 启动一个 Postgresql 连接的追踪功能
• pg_transaction_status— Returns the current in-transaction status of the server.
• pg_tty— 返回该连接的 tty 号
• pg_unescape_bytea— 取消 bytea 类型中的字符串转义
• pg_untrace— 关闭 Postgresql 连接的追踪功能
• pg_update— 更新表
• pg_version— Returns an array with client,protocol and server version (when available)

原文地址：https://www.jb51.cc/postgresql/196090.html