预定义常量

    下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

    MYSQLI_READ_DEFAULT_GROUP (int)

    Read options from the named group from my.cnf or the file specified with MYSQLI_READ_DEFAULT_FILE

    MYSQLI_READ_DEFAULT_FILE (int)

    Read options from the named option file instead of from my.cnf

    MYSQLI_OPT_CONNECT_TIMEOUT (int)

    Connect timeout in seconds

    MYSQLI_OPT_READ_TIMEOUT (int)

    Command execution result timeout in seconds. Available as of PHP 7.2.0.

    MYSQLI_OPT_LOCAL_INFILE (int)

    Enables command LOAD LOCAL INFILE

    MYSQLI_OPT_INT_AND_FLOAT_NATIVE (int)

    Convert integer and float columns back to PHP numbers. Only valid for mysqlnd.

    MYSQLI_OPT_NET_CMD_BUFFER_SIZE (int)

    The size of the internal command/network buffer. Only valid for mysqlnd.

    MYSQLI_OPT_NET_READ_BUFFER_SIZE (int)

    Maximum read chunk size in bytes when reading the body of a MySQL command packet. Only valid for mysqlnd.

    MYSQLI_OPT_SSL_VERIFY_SERVER_CERT (int)

    需要 MySQL 5.1.10 及更高版本

    MYSQLI_INIT_COMMAND (int)

    Command to execute when connecting to MySQL server. Will automatically be re-executed when reconnecting.

    MYSQLI_CLIENT_SSL (int)

    Use SSL (encrypted protocol). This option should not be set by application programs; it is set internally in the MySQL client library

    MYSQLI_CLIENT_COMPRESS (int)

    Use compression protocol

    MYSQLI_CLIENT_INTERACTIVE (int)

    Allow interactive_timeout seconds (instead of wait_timeout seconds) of inactivity before closing the connection. The client's session wait_timeout variable will be set to the value of the session interactive_timeout variable.

    MYSQLI_CLIENT_IGNORE_SPACE (int)

    Allow spaces after function names. Makes all functions names reserved words.

    MYSQLI_CLIENT_NO_SCHEMA (int)

    Don't allow the db_name.tbl_name.col_name syntax.

    MYSQLI_CLIENT_MULTI_QUERIES (int)

    Allows multiple semicolon-delimited queries in a single mysqli_query() call.

    MYSQLI_STORE_RESULT (int)

    使用缓冲的结果集合。值为 0。

    MYSQLI_USE_RESULT (int)

    使用无缓冲的结果集合。值为 1。

    MYSQLI_ASSOC (int)

    Columns are returned into the array having the fieldname as the array index.

    MYSQLI_NUM (int)

    Columns are returned into the array having an enumerated index.

    MYSQLI_BOTH (int)

    Columns are returned into the array having both a numerical index and the fieldname as the associative index.

    MYSQLI_NOT_NULL_FLAG (int)

    Indicates that a field is defined as NOT NULL

    MYSQLI_PRI_KEY_FLAG (int)

    Field is part of a primary index

    MYSQLI_UNIQUE_KEY_FLAG (int)

    Field is part of a unique index.

    MYSQLI_MULTIPLE_KEY_FLAG (int)

    Field is part of an index.

    MYSQLI_BLOB_FLAG (int)

    Field is defined as BLOB

    MYSQLI_UNSIGNED_FLAG (int)

    Field is defined as UNSIGNED

    MYSQLI_ZEROFILL_FLAG (int)

    Field is defined as ZEROFILL

    MYSQLI_AUTO_INCREMENT_FLAG (int)

    Field is defined as AUTO_INCREMENT

    MYSQLI_TIMESTAMP_FLAG (int)

    Field is defined as TIMESTAMP

    MYSQLI_SET_FLAG (int)

    Field is defined as SET

    MYSQLI_NUM_FLAG (int)

    Field is defined as NUMERIC

    MYSQLI_PART_KEY_FLAG (int)

    Field is part of an multi-index

    MYSQLI_GROUP_FLAG (int)

    Field is part of GROUP BY

    MYSQLI_TYPE_DECIMAL (int)

    Field is defined as DECIMAL

    MYSQLI_TYPE_NEWDECIMAL (int)

    Precision math DECIMAL or NUMERIC field (MySQL 5.0.3 and up)

    MYSQLI_TYPE_BIT (int)

    Field is defined as BIT (MySQL 5.0.3 and up)

    MYSQLI_TYPE_TINY (int)

    Field is defined as TINYINT

    MYSQLI_TYPE_SHORT (int)

    Field is defined as SMALLINT

    MYSQLI_TYPE_LONG (int)

    Field is defined as INT

    MYSQLI_TYPE_FLOAT (int)

    Field is defined as FLOAT

    MYSQLI_TYPE_DOUBLE (int)

    Field is defined as DOUBLE

    MYSQLI_TYPE_NULL (int)

    Field is defined as DEFAULT NULL

    MYSQLI_TYPE_TIMESTAMP (int)

    Field is defined as TIMESTAMP

    MYSQLI_TYPE_LONGLONG (int)

    Field is defined as BIGINT

    MYSQLI_TYPE_INT24 (int)

    Field is defined as MEDIUMINT

    MYSQLI_TYPE_DATE (int)

    Field is defined as DATE

    MYSQLI_TYPE_TIME (int)

    Field is defined as TIME

    MYSQLI_TYPE_DATETIME (int)

    Field is defined as DATETIME

    MYSQLI_TYPE_YEAR (int)

    Field is defined as YEAR

    MYSQLI_TYPE_NEWDATE (int)

    Field is defined as DATE

    MYSQLI_TYPE_INTERVAL (int)

    Field is defined as INTERVAL

    MYSQLI_TYPE_ENUM (int)

    Field is defined as ENUM

    MYSQLI_TYPE_SET (int)

    Field is defined as SET

    MYSQLI_TYPE_TINY_BLOB (int)

    Field is defined as TINYBLOB

    MYSQLI_TYPE_MEDIUM_BLOB (int)

    Field is defined as MEDIUMBLOB

    MYSQLI_TYPE_LONG_BLOB (int)

    Field is defined as LONGBLOB

    MYSQLI_TYPE_BLOB (int)

    Field is defined as BLOB

    MYSQLI_TYPE_VAR_STRING (int)

    Field is defined as VARCHAR

    MYSQLI_TYPE_STRING (int)

    字段定义为 CHAR 或 BINARY

    MYSQLI_TYPE_CHAR (int)

    字段定义为 TINYINT。对于 CHAR，参阅 MYSQLI_TYPE_STRING

    MYSQLI_TYPE_GEOMETRY (int)

    Field is defined as GEOMETRY

    MYSQLI_TYPE_JSON (int)

    字段定义为 JSON。仅对 mysqlnd 和 MySQL 5.7.8 及更高版本有效。

    MYSQLI_NEED_DATA (int)

    More data available for bind variable

    MYSQLI_NO_DATA (int)

    No more data available for bind variable

    MYSQLI_DATA_TRUNCATED (int)

    发生数据截断。自 MySQL 5.0.5 起可用。

    MYSQLI_ENUM_FLAG (int)

    字段定义为 ENUM。

    MYSQLI_BINARY_FLAG (int)

    字段定义为 BINARY。

    MYSQLI_CURSOR_TYPE_FOR_UPDATE (int)

    MYSQLI_CURSOR_TYPE_NO_CURSOR (int)

    MYSQLI_CURSOR_TYPE_READ_ONLY (int)

    MYSQLI_CURSOR_TYPE_SCROLLABLE (int)

    MYSQLI_STMT_ATTR_CURSOR_TYPE (int)

    MYSQLI_STMT_ATTR_PREFETCH_ROWS (int)

    MYSQLI_STMT_ATTR_UPDATE_MAX_LENGTH (int)

    MYSQLI_SET_CHARSET_NAME (int)

    MYSQLI_REPORT_INDEX (int)

    如果在查询中没有使用索引或使用了坏索引，则会报告。

    MYSQLI_REPORT_ERROR (int)

    报告来自 mysqli 函数调用的错误。

    MYSQLI_REPORT_STRICT (int)

    抛出 mysqli_sql_exception 错误而不是警告。

    MYSQLI_REPORT_ALL (int)

    启用所有选项（报告所有）。

    MYSQLI_REPORT_OFF (int)

    关闭报告功能。

    MYSQLI_DEBUG_TRACE_ENABLED (int)

    如果 mysqli_debug() 功能启用，设置为 1。

    MYSQLI_SERVER_QUERY_NO_GOOD_INDEX_USED (int)

    MYSQLI_SERVER_QUERY_NO_INDEX_USED (int)

    MYSQLI_SERVER_PUBLIC_KEY (int)

    MYSQLI_REFRESH_GRANT (int)

    刷新授权表。

    MYSQLI_REFRESH_LOG (int)

    刷新日志，就像执行 FLUSH LOGS SQL 语句。

    MYSQLI_REFRESH_TABLES (int)

    刷新表缓存，就像执行 FLUSH TABLES SQL 语句。

    MYSQLI_REFRESH_HOSTS (int)

    刷新主机缓存，就像执行刷新 FLUSH HOSTS SQL 语句一样。

    MYSQLI_REFRESH_REPLICA (int)

    MYSQLI_REFRESH_SLAVE 常量的别名。自 PHP 8.1.0 起可用。

    MYSQLI_REFRESH_STATUS (int)

    重置状态变量，如执行 FLUSH STATUS SQL 语句。

    MYSQLI_REFRESH_THREADS (int)

    刷新线程缓存。

    MYSQLI_REFRESH_SLAVE (int)

    在从复制服务器上：重置主服务器信息，并重新启动从服务器。就像执行 RESET SLAVE SQL 语句一样。

    MYSQLI_REFRESH_MASTER (int)

    在主复制服务器上：删除二进制日志索引中列出的二进制日志文件，并截断索引文件。就像执行 RESET MASTER SQL 语句一样。

    MYSQLI_TRANS_COR_AND_CHAIN (int)

    追加“AND CHAIN”到 mysqli_commit() 或 mysqli_rollback()。

    MYSQLI_TRANS_COR_AND_NO_CHAIN (int)

    追加“AND NO CHAIN”到 mysqli_commit() 或 mysqli_rollback()。

    MYSQLI_TRANS_COR_RELEASE (int)

    追加“RELEASE”到 mysqli_commit() 或 mysqli_rollback()。

    MYSQLI_TRANS_COR_NO_RELEASE (int)

    追加“NO RELEASE”到 mysqli_commit() 或 mysqli_rollback()。

    MYSQLI_TRANS_START_READ_ONLY (int)

    使用 mysqli_begin_transaction() 作为“START TRANSACTION READ ONLY”启动事务。

    MYSQLI_TRANS_START_READ_WRITE (int)

    使用 mysqli_begin_transaction() 作为“START TRANSACTION READ WRITE”启动事务。

    MYSQLI_TRANS_START_CONSISTENT_SNAPSHOT (int)

    使用 mysqli_begin_transaction() 作为“START TRANSACTION WITH CONSISTENT SNAPSHOT” 启动事务。

    MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT (int)

    需要 MySQL 5.6.5 及其以上版本。

    MYSQLI_IS_MARIADB (bool)

    mysqli 扩展是否针对 MariaDB 客户端库编译。自 PHP 8.1.2 起有效。

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