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概況

當mysql客戶端使用show column命令時即對應這個FieldList命令包。

mysql通訊報文結構

FieldList命令包

Payload

1              [04
 
] COM_FIELD_LIST
string[NUL]    table
string[EOF]    field wildcard

FieldList命令包操作

1. FieldList命令包類

/**
 * 
 * <pre><b>mysql field list packet.</b></pre>
 * @author 
 * <pre>seaboat</pre>
 * <pre><b>email: </b>[email protected]</pre>
 * <pre><b>blog: </b>http://blog.csdn.net/wangyangzhizhou</pre>
 * @version
 
 1.0
 * @see http://dev.mysql.com/doc/internals/en/com-field-list.html
 */
public class FieldListPacket extends MySQLPacket {
    public byte flag;
    public byte[] table;
    public byte[] fieldWildcard;

    @Override
    public void read(byte[] data) {
        MySQLMessage mm = new MySQLMessage(data);
        packetLength = mm.readUB3();
        packetId = mm.read();
        flag = mm.read();
        table = mm.readBytesWithNull();
        fieldWildcard = mm.readBytes();
    }

    @Override
 

    public void write(ByteBuffer buffer) {
        BufferUtil.writeUB3(buffer, calcPacketSize());
        buffer.put(packetId);
        buffer.put(COM_FIELD_LIST);
        BufferUtil.writeWithNull(buffer, table);
        buffer.put(fieldWildcard);
    }

    @Override
    public int calcPacketSize() {
        int i = 1;
        i += table.length + 1;
        i += fieldWildcard.length;
        return i;
    }

    @Override
    protected String getPacketInfo() {
        return "MySQL Field List Packet";
    }

}

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