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  • MySQL--连接属性

    The capability flags are used by the client and server to indicate which features they support and want to use.

    Protocol::CapabilityFlags:

    CLIENT_LONG_PASSWORD

    Use the improved version of Old Password Authentication.

    Note

    Assumed to be set since 4.1.1.

    Value

    0x00000001

    CLIENT_FOUND_ROWS

    Send found rows instead of affected rows in EOF_Packet.

    Value

    0x00000002

    CLIENT_LONG_FLAG

    Longer flags in Protocol::ColumnDefinition320.

    Value

    0x00000004

    Server

    Supports longer flags.

    Client

    Expects longer flags.

    CLIENT_CONNECT_WITH_DB

    Database (schema) name can be specified on connect in Handshake Response Packet.

    Value

    0x00000008

    Server

    Supports schema-name in Handshake Response Packet.

    Client

    Handshake Response Packet contains a schema-name.

    CLIENT_NO_SCHEMA
    Value

    0x00000010

    Server

    Do not permit database.table.column.

    CLIENT_COMPRESS

    Compression protocol supported.

    Value

    0x00000020

    Server

    Supports compression.

    Client

    Switches to Compression compressed protocol after successful authentication.

    CLIENT_ODBC
    Value

    0x00000040

    Special handling of ODBC behavior.

    Note

    No special behavior since 3.22.

    CLIENT_LOCAL_FILES

    Can use LOAD DATA LOCAL.

    Value

    0x00000080

    Server

    Enables the LOCAL INFILE request of LOAD DATA|XML.

    Client

    Will handle LOCAL INFILE request.

    CLIENT_IGNORE_SPACE
    Value

    0x00000100

    Server

    Parser can ignore spaces before '('.

    Client

    Let the parser ignore spaces before '('.

    CLIENT_PROTOCOL_41
    Value

    0x00000200

    Server

    Supports the 4.1 protocol.

    Client

    Uses the 4.1 protocol.

    Note

    this value was CLIENT_CHANGE_USER in 3.22, unused in 4.0

    CLIENT_INTERACTIVE

    wait_timeout versus wait_interactive_timeout.

    Value

    0x00000400

    Server

    Supports interactive and noninteractive clients.

    Client

    Client is interactive.

    See

    mysql_real_connect()

    CLIENT_SSL
    Value

    0x00000800

    Server

    Supports SSL.

    Client

    Switch to SSL after sending the capability-flags.

    CLIENT_IGNORE_SIGPIPE
    Value

    0x00001000

    Client

    Do not issue SIGPIPE if network failures occur (libmysqlclient only).

    See

    mysql_real_connect()

    CLIENT_TRANSACTIONS
    Value

    0x00002000

    Server

    Can send status flags in EOF_Packet.

    Client

    Expects status flags in EOF_Packet.

    Note

    This flag is optional in 3.23, but always set by the server since 4.0.

    CLIENT_RESERVED

    Unused.

    Value

    0x00004000

    Note

    Was named CLIENT_PROTOCOL_41 in 4.1.0.

    CLIENT_SECURE_CONNECTION
    Value

    0x00008000

    Server

    Supports Authentication::Native41.

    Client

    Supports Authentication::Native41.

    CLIENT_MULTI_STATEMENTS
    Value

    0x00010000

    Server

    Can handle multiple statements per COM_QUERY and COM_STMT_PREPARE.

    Client

    May send multiple statements per COM_QUERY and COM_STMT_PREPARE.

    Note

    Was named CLIENT_MULTI_QUERIES in 4.1.0, renamed later.

    CLIENT_MULTI_RESULTS
    Value

    0x00020000

    Server

    Can send multiple resultsets for COM_QUERY.

    Client

    Can handle multiple resultsets for COM_QUERY.

    Requires

    CLIENT_PROTOCOL_41

    CLIENT_PS_MULTI_RESULTS
    Server

    Can send multiple resultsets for COM_STMT_EXECUTE.

    Client

    Can handle multiple resultsets for COM_STMT_EXECUTE.

    Value

    0x00040000

    Requires

    CLIENT_PROTOCOL_41

    CLIENT_PLUGIN_AUTH
    Value

    0x00080000

    Server

    Sends extra data in Initial Handshake Packet and supports the pluggable authentication protocol.

    Client

    Supports authentication plugins.

    Requires

    CLIENT_PROTOCOL_41

    CLIENT_CONNECT_ATTRS
    Value

    0x00100000

    Server

    Permits connection attributes in Protocol::HandshakeResponse41.

    Client

    Sends connection attributes in Protocol::HandshakeResponse41.

    CLIENT_PLUGIN_AUTH_LENENC_CLIENT_DATA
    Value

    0x00200000

    Server

    Understands length-encoded integer for auth response data in Protocol::HandshakeResponse41.

    Client

    Length of auth response data in Protocol::HandshakeResponse41 is a length-encoded integer.

    Note

    The flag was introduced in 5.6.6, but had the wrong value.

    CLIENT_CAN_HANDLE_EXPIRED_PASSWORDS
    Value

    0x00400000

    Server

    Announces support for expired password extension.

    Client

    Can handle expired passwords.

    CLIENT_SESSION_TRACK
    Value

    0x00800000

    Server

    Can set SERVER_SESSION_STATE_CHANGED in the Status Flags and send session-state change data after a OK packet.

    Client

    Expects the server to send sesson-state changes after a OK packet.

    CLIENT_DEPRECATE_EOF
    Value

    0x01000000

    Server

    Can send OK after a Text Resultset.

    Client

    Expects an OK (instead of EOF) after the resultset rows of a Text Resultset.

    Background

    To support CLIENT_SESSION_TRACK, additional information must be sent after all successful commands. Although the OK packet is extensible, the EOF packet is not due to the overlap of its bytes with the content of the Text Resultset Row.

    Therefore, the EOF packet in the Text Resultset is replaced with an OK packet. EOF packets are deprecated as of MySQL 5.7.5.

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  • 原文地址:https://www.cnblogs.com/JiangLe/p/5701395.html
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