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: Read options from the named group from my.cnf or the file specified with MYSQLI_READ_DEFAULT_FILE
MYSQLI_READ_DEFAULT_FILE: Read options from the named option file instead of from my.cnf
MYSQLI_OPT_CONNECT_TIMEOUT: Connect timeout in seconds
MYSQLI_OPT_LOCAL_INFILE: Enables command LOAD LOCAL INFILE
MYSQLI_INIT_COMMAND: Command to execute when connecting to MySQL server. Will automatically be re-executed when reconnecting.
MYSQLI_CLIENT_SSL: 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: Use compression protocol
MYSQLI_CLIENT_INTERACTIVE: 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: Allow spaces after function names. Makes all functions names reserved words.
MYSQLI_CLIENT_NO_SCHEMA: Don't allow the db_name.tbl_name.col_name syntax.
MYSQLI_CLIENT_MULTI_QUERIES: Allows multiple semicolon-delimited queries in a single mysqli_query() call.
MYSQLI_STORE_RESULT: For using buffered resultsets
MYSQLI_USE_RESULT: For using unbuffered resultsets
MYSQLI_ASSOC: Columns are returned into the array having the fieldname as the array index.
MYSQLI_NUM: Columns are returned into the array having an enumerated index.
MYSQLI_BOTH: Columns are returned into the array having both a numerical index and the fieldname as the associative index.
MYSQLI_NOT_NULL_FLAG: Indicates that a field is defined as NOT NULL
MYSQLI_PRI_KEY_FLAG: Field is part of a primary index
MYSQLI_UNIQUE_KEY_FLAG: Field is part of a unique index.
MYSQLI_MULTIPLE_KEY_FLAG: Field is part of an index.
MYSQLI_BLOB_FLAG: Field is defined as BLOB
MYSQLI_UNSIGNED_FLAG: Field is defined as UNSIGNED
MYSQLI_ZEROFILL_FLAG: Field is defined as ZEROFILL
MYSQLI_AUTO_INCREMENT_FLAG: Field is defined as AUTO_INCREMENT
MYSQLI_TIMESTAMP_FLAG: Field is defined as TIMESTAMP
MYSQLI_SET_FLAG: Field is defined as SET
MYSQLI_NUM_FLAG: Field is defined as NUMERIC
MYSQLI_PART_KEY_FLAG: Field is part of an multi-index
MYSQLI_GROUP_FLAG: Field is part of GROUP BY
MYSQLI_TYPE_DECIMAL: Field is defined as DECIMAL
MYSQLI_TYPE_NEWDECIMAL: Precision math DECIMAL or NUMERIC field (MySQL 5.0.3 and up)
MYSQLI_TYPE_BIT: Field is defined as BIT (MySQL 5.0.3 and up)
MYSQLI_TYPE_TINY: Field is defined as TINYINT
MYSQLI_TYPE_SHORT: Field is defined as SMALLINT
MYSQLI_TYPE_LONG: Field is defined as INT
MYSQLI_TYPE_FLOAT: Field is defined as FLOAT
MYSQLI_TYPE_DOUBLE: Field is defined as DOUBLE
MYSQLI_TYPE_NULL: Field is defined as DEFAULT NULL
MYSQLI_TYPE_TIMESTAMP: Field is defined as TIMESTAMP
MYSQLI_TYPE_LONGLONG: Field is defined as BIGINT
MYSQLI_TYPE_INT24: Field is defined as MEDIUMINT
MYSQLI_TYPE_DATE: Field is defined as DATE
MYSQLI_TYPE_TIME: Field is defined as TIME
MYSQLI_TYPE_DATETIME: Field is defined as DATETIME
MYSQLI_TYPE_YEAR: Field is defined as YEAR
MYSQLI_TYPE_NEWDATE: Field is defined as DATE
MYSQLI_TYPE_INTERVAL: Field is defined as INTERVAL
MYSQLI_TYPE_ENUM: Field is defined as ENUM
MYSQLI_TYPE_SET: Field is defined as SET
MYSQLI_TYPE_TINY_BLOB: Field is defined as TINYBLOB
MYSQLI_TYPE_MEDIUM_BLOB: Field is defined as MEDIUMBLOB
MYSQLI_TYPE_LONG_BLOB: Field is defined as LONGBLOB
MYSQLI_TYPE_BLOB: Field is defined as BLOB
MYSQLI_TYPE_VAR_STRING: Field is defined as VARCHAR
MYSQLI_TYPE_STRING: Field is defined as STRING
MYSQLI_TYPE_CHAR: Field is defined as CHAR
MYSQLI_TYPE_GEOMETRY: Field is defined as GEOMETRY
MYSQLI_NEED_DATA: More data available for bind variable
MYSQLI_NO_DATA: No more data available for bind variable
MYSQLI_DATA_TRUNCATED: Data truncation occurred. Available since PHP 5.1.0 and MySQL 5.0.5.
MYSQLI_ENUM_FLAG: Field is defined as ENUM. Available since PHP 5.3.0.
MYSQLI_CURSOR_TYPE_FOR_UPDATE
MYSQLI_CURSOR_TYPE_NO_CURSOR
MYSQLI_CURSOR_TYPE_READ_ONLY
MYSQLI_CURSOR_TYPE_SCROLLABLE
MYSQLI_STMT_ATTR_CURSOR_TYPE
MYSQLI_STMT_ATTR_PREFETCH_ROWS
MYSQLI_STMT_ATTR_UPDATE_MAX_LENGTH
MYSQLI_SET_CHARSET_NAME
MYSQLI_REPORT_INDEX: Report if no index or bad index was used in a query.
MYSQLI_REPORT_ERROR: Report errors from mysqli function calls.
MYSQLI_REPORT_STRICT: Throw a mysqli_sql_exception for errors instead of warnings.
MYSQLI_REPORT_ALL: Set all options on (report all).
MYSQLI_REPORT_OFF: Turns reporting off.
MYSQLI_DEBUG_TRACE_ENABLED: Is set to 1 if mysqli_debug() functionality is enabled.
MYSQLI_SERVER_QUERY_NO_GOOD_INDEX_USED
MYSQLI_SERVER_QUERY_NO_INDEX_USED
MYSQLI_REFRESH_GRANT: Refreshes the grant tables.
MYSQLI_REFRESH_LOG: Flushes the logs, like executing the FLUSH LOGS SQL statement.
MYSQLI_REFRESH_TABLES: Flushes the table cache, like executing the FLUSH TABLES SQL statement.
MYSQLI_REFRESH_HOSTS: Flushes the host cache, like executing the FLUSH HOSTS SQL statement.
MYSQLI_REFRESH_STATUS: Reset the status variables, like executing the FLUSH STATUS SQL statement.
MYSQLI_REFRESH_THREADS: Flushes the thread cache.
MYSQLI_REFRESH_SLAVE: On a slave replication server: resets the master server information, and restarts the slave. Like executing the RESET SLAVE SQL statement.
MYSQLI_REFRESH_MASTER: On a master replication server: removes the binary log files listed in the binary log index, and truncates the index file. Like executing the RESET MASTER SQL statement.