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MySQL--连接属性

时间：2021-07-01 10:21:17 帮助过：3人阅读

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.

Requires: CLIENT_PROTOCOL_41

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.

MySQL--连接属性

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MySQL--连接属性

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