Weka学习之预处理连接MySql（二）

载入数据

（一）打开文件

（二） 打开url

（三） 打开数据库

（四）从一些数据生成器（DataGenerators）中生成人造数据 

  这篇主要写（三）中的连接mySql

         网上教程很多这里写个简单步骤

推荐一篇文章

http://blog.csdn.net/senaku/article/details/2225943

下载必要的工具 mysql驱动（有的就别下了）

http://pan.baidu.com/share/link?shareid=2530503288&uk=1010575044

weka 3.6.10的（无jre版）

http://pan.baidu.com/share/link?shareid=2578038226&uk=1010575044

jdk

http://pan.baidu.com/share/link?shareid=2585337924&uk=1010575044

下好安装就不介绍了，先安装jdk，配置环境变量，在安装weka。

　　配置环境变量

　　JAVA_HOME

　　D:\Program Files\Java\jdk1.7.0_09

　　ClassPath

　　.

下载完后，在weka的安装目录下"D:\Program Files\Weka-3-6"新建lib文件夹，将jar包复制到lib文件夹下，并且在"D:\Program Files\Java\jdk1.7.0_09\jre\lib\ext"下也放mysql-connector-java-5.1.6-bin.jar

　　设置环境变量

　　JAVA_HOME

　　D:\Program Files\Java\jdk1.7.0_09

　　WEKA_HOME
　　D:\Program Files\Weka-3-6

　　ClassPath

　　.;%WEKA_HOME%\lib\mysql-connector-java-5.1.26-bin.jar;%JAVA_HOME%\jre\lib\ext\mysql-connector-java-5.1.26-bin.jar;

　　设置完成后,weka就能找到放在\lib中的数据库jar包了.

　　在C:\Program Files\Weka-3-6\weka.jar\experiment里找到DatabaseUtils.props.mysql，将其名字改成DatabaseUtils.props，替换原有的DatabaseUtils.props文件，并将其修改文件里的以下内容：

# Database settings for MySQL 3.23.x, 4.x
#
# General information on database access can be found here:
# http://weka.wikispaces.com/Databases
#
# url:     http://www.mysql.com/
# jdbc:    http://www.mysql.com/products/connector/j/
# author:  Fracpete (fracpete at waikato dot ac dot nz)
# version: $Revision: 5836 $
 
# JDBC driver (comma-separated list)
#jdbcDriver=org.gjt.mm.mysql.Driver
jdbcDriver=com.mysql.jdbc.Driver
 
# database URL
#jdbcURL=jdbc:mysql://server_name:3306/database_name
jdbcURL=jdbc:mysql://localhost:3306/rtest
# specific data types
# string, getString() = 0;    --> nominal
# boolean, getBoolean() = 1;  --> nominal
# double, getDouble() = 2;    --> numeric
# byte, getByte() = 3;        --> numeric
# short, getByte()= 4;        --> numeric
# int, getInteger() = 5;      --> numeric
# long, getLong() = 6;        --> numeric
# float, getFloat() = 7;      --> numeric
# date, getDate() = 8;        --> date
# text, getString() = 9;      --> string
# time, getTime() = 10;       --> date
 
# specific data types
 string, getString() = 0;    --> nominal
 boolean, getBoolean() = 1;  --> nominal
 double, getDouble() = 2;    --> numeric
 byte, getByte() = 3;        --> numeric
 short, getByte()= 4;        --> numeric
 int, getInteger() = 5;      --> numeric
 long, getLong() = 6;        --> numeric
 float, getFloat() = 7;      --> numeric
 date, getDate() = 8;        --> date
 text, getString() = 9;      --> string
 time, getTime() = 10;       --> date
TINYINT=3
SMALLINT=4
#SHORT=4
SHORT=5
INTEGER=5
INT=5
INT_UNSIGNED=6
BIGINT=6
LONG=6
REAL=7
NUMERIC=2
DECIMAL=2
FLOAT=2
DOUBLE=2
CHAR=0
TEXT=0
VARCHAR=0
LONGVARCHAR=9
BINARY=0
VARBINARY=0
LONGVARBINARY=9
BIT=1
BLOB=9
DATE=8
TIME=8
DATETIME=8
TIMESTAMP=8
 
# other options
CREATE_DOUBLE=DOUBLE
CREATE_STRING=TEXT
CREATE_INT=INT
CREATE_DATE=DATETIME
DateFormat=yyyy-MM-dd HH:mm:ss
checkUpperCaseNames=false
checkLowerCaseNames=false
checkForTable=true
 
# All the reserved keywords for this database
# Based on the keywords listed at the following URL (2009-04-13):
# http://dev.mysql.com/doc/mysqld-version-reference/en/mysqld-version-reference-reservedwords-5-0.html
Keywords=\
  ADD,\
  ALL,\
  ALTER,\
  ANALYZE,\
  AND,\
  AS,\
  ASC,\
  ASENSITIVE,\
  BEFORE,\
  BETWEEN,\
  BIGINT,\
  BINARY,\
  BLOB,\
  BOTH,\
  BY,\
  CALL,\
  CASCADE,\
  CASE,\
  CHANGE,\
  CHAR,\
  CHARACTER,\
  CHECK,\
  COLLATE,\
  COLUMN,\
  COLUMNS,\
  CONDITION,\
  CONNECTION,\
  CONSTRAINT,\
  CONTINUE,\
  CONVERT,\
  CREATE,\
  CROSS,\
  CURRENT_DATE,\
  CURRENT_TIME,\
  CURRENT_TIMESTAMP,\
  CURRENT_USER,\
  CURSOR,\
  DATABASE,\
  DATABASES,\
  DAY_HOUR,\
  DAY_MICROSECOND,\
  DAY_MINUTE,\
  DAY_SECOND,\
  DEC,\
  DECIMAL,\
  DECLARE,\
  DEFAULT,\
  DELAYED,\
  DELETE,\
  DESC,\
  DESCRIBE,\
  DETERMINISTIC,\
  DISTINCT,\
  DISTINCTROW,\
  DIV,\
  DOUBLE,\
  DROP,\
  DUAL,\
  EACH,\
  ELSE,\
  ELSEIF,\
  ENCLOSED,\
  ESCAPED,\
  EXISTS,\
  EXIT,\
  EXPLAIN,\
  FALSE,\
  FETCH,\
  FIELDS,\
  FLOAT,\
  FLOAT4,\
  FLOAT8,\
  FOR,\
  FORCE,\
  FOREIGN,\
  FROM,\
  FULLTEXT,\
  GOTO,\
  GRANT,\
  GROUP,\
  HAVING,\
  HIGH_PRIORITY,\
  HOUR_MICROSECOND,\
  HOUR_MINUTE,\
  HOUR_SECOND,\
  IF,\
  IGNORE,\
  IN,\
  INDEX,\
  INFILE,\
  INNER,\
  INOUT,\
  INSENSITIVE,\
  INSERT,\
  INT,\
  INT1,\
  INT2,\
  INT3,\
  INT4,\
  INT8,\
  INTEGER,\
  INTERVAL,\
  INTO,\
  IS,\
  ITERATE,\
  JOIN,\
  KEY,\
  KEYS,\
  KILL,\
  LABEL,\
  LEADING,\
  LEAVE,\
  LEFT,\
  LIKE,\
  LIMIT,\
  LINES,\
  LOAD,\
  LOCALTIME,\
  LOCALTIMESTAMP,\
  LOCK,\
  LONG,\
  LONGBLOB,\
  LONGTEXT,\
  LOOP,\
  LOW_PRIORITY,\
  MATCH,\
  MEDIUMBLOB,\
  MEDIUMINT,\
  MEDIUMTEXT,\
  MIDDLEINT,\
  MINUTE_MICROSECOND,\
  MINUTE_SECOND,\
  MOD,\
  MODIFIES,\
  NATURAL,\
  NOT,\
  NO_WRITE_TO_BINLOG,\
  NULL,\
  NUMERIC,\
  ON,\
  OPTIMIZE,\
  OPTION,\
  OPTIONALLY,\
  OR,\
  ORDER,\
  OUT,\
  OUTER,\
  OUTFILE,\
  PRECISION,\
  PRIMARY,\
  PRIVILEGES,\
  PROCEDURE,\
  PURGE,\
  READ,\
  READS,\
  REAL,\
  REFERENCES,\
  REGEXP,\
  RELEASE,\
  RENAME,\
  REPEAT,\
  REPLACE,\
  REQUIRE,\
  RESTRICT,\
  RETURN,\
  REVOKE,\
  RIGHT,\
  RLIKE,\
  SCHEMA,\
  SCHEMAS,\
  SECOND_MICROSECOND,\
  SELECT,\
  SENSITIVE,\
  SEPARATOR,\
  SET,\
  SHOW,\
  SMALLINT,\
  SONAME,\
  SPATIAL,\
  SPECIFIC,\
  SQL,\
  SQLEXCEPTION,\
  SQLSTATE,\
  SQLWARNING,\
  SQL_BIG_RESULT,\
  SQL_CALC_FOUND_ROWS,\
  SQL_SMALL_RESULT,\
  SSL,\
  STARTING,\
  STRAIGHT_JOIN,\
  TABLE,\
  TABLES,\
  TERMINATED,\
  THEN,\
  TINYBLOB,\
  TINYINT,\
  TINYTEXT,\
  TO,\
  TRAILING,\
  TRIGGER,\
  TRUE,\
  UNDO,\
  UNION,\
  UNIQUE,\
  UNLOCK,\
  UNSIGNED,\
  UPDATE,\
  UPGRADE,\
  USAGE,\
  USE,\
  USING,\
  UTC_DATE,\
  UTC_TIME,\
  UTC_TIMESTAMP,\
  VALUES,\
  VARBINARY,\
  VARCHAR,\
  VARCHARACTER,\
  VARYING,\
  WHEN,\
  WHERE,\
  WHILE,\
  WITH,\
  WRITE,\
  XOR,\
  YEAR_MONTH,\
  ZEROFILL
 
# The character to append to attribute names to avoid exceptions due to
# clashes between keywords and attribute names
KeywordsMaskChar=_
 
#flags for loading and saving instances using DatabaseLoader/Saver
nominalToStringLimit=50
idColumn=auto_generated_id

　　运行weka，选择open DB，选择user，我所用的用户名和密码分别是root（安装数据库时默认的，我没改就用的root）和mysql（安装mysql时设置的密码），点击connect，info显示connecting to:jdbc:mysql://localhost:3306/myweka = true，代表连接成功

连上后在"Query"一栏中写入SQL查询语句，例如

select * from user;

然后点右边的"Excute"按钮。（如果连接数据库不成功是无法Excute的）
"Result"一栏中会显示有关结果，满意后点击最下方的"OK"按钮。Explorer就从数据库中载入数据集了。

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我自己在操作的时候遇到一个INT UNSIGNED dataType没有定义的问题，解决方法：

有时候点击OK 的时候提示没有dataType原因是weka不识别，你可以在上面的文件里添加对应的数据类型即可。

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其他的数据库操作步骤基本一致，就不介绍了。