亚洲精品国产综合区久久久久久久,国产对白在线正在播放,成人av中文字幕

Java�q�接各种数据库的实例

vv — Thu, 03 Jan 2008 09:29:00 GMT

1、Oracle8/8i/9i数据库（thin模式�Q?/strong>

Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

String url="jdbc:oracle:thin:@localhost:1521:orcl";

//orcl为数据库的SID

String user="test";

String password="test";

Connection conn= DriverManager.getConnection(url,user,password);

2�?a style="font-size: 14px; color: #0000ff; text-decoration: none" target="_blank">DB2数据�?/strong>

Class.forName("com.ibm.db2.jdbc.app.DB2Driver ").newInstance();

String url="jdbc:db2://localhost:5000/sample";

//sample��Z��的数据库�?br />
String user="admin";

String password="";

Connection conn= DriverManager.getConnection(url,user,password);

3、Sql Server7.0/2000数据�?/strong>

Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();

String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=mydb";

//mydb为数据库

String user="sa";

String password="";

Connection conn= DriverManager.getConnection(url,user,password);

4、Sybase数据�?/strong>

Class.forName("com.sybase.jdbc.SybDriver").newInstance();

String url =" jdbc:sybase:Tds:localhost:5007/myDB";

//myDB��Z��的数据库�?br />
Properties sysProps = System.getProperties();

SysProps.put("user","userid");

SysProps.put("password","user_password");

Connection conn= DriverManager.getConnection(url, SysProps);

5、Informix数据�?/strong>

Class.forName("com.informix.jdbc.IfxDriver").newInstance();

String url =

"jdbc:informix-sqli://123.45.67.89:1533/myDB:INFORMIXSERVER=myserver;

user=testuser;password=testpassword";

//myDB为数据库�?br />
Connection conn= DriverManager.getConnection(url);

6、MySQL数据�?/strong>

Class.forName("org.gjt.mm.mysql.Driver").newInstance();

String url ="jdbc:mysql://localhost/myDB?

user=soft&password=soft1234&useUnicode=true&characterEncoding=8859_1"

//myDB为数据库�?br />
Connection conn= DriverManager.getConnection(url);

7、PostgreSQL数据�?/strong>

Class.forName("org.postgresql.Driver").newInstance();

String url ="jdbc:postgresql://localhost/myDB"

//myDB为数据库�?br />
String user="myuser";

String password="mypassword";

Connection conn= DriverManager.getConnection(url,user,password);

vv 2008-01-03 17:29 发表评论

vv — Thu, 03 Jan 2008 06:56:00 GMT

ORACLE �?PostgreSQL 相异�?/strong>

NO 问题�?/strong> Oracle PostgreSQL

1 1+1
或�?br /> CREATE VIEW dual AS
      SELECT 'X'::VARCHAR(1) AS DUMMY
�?SELECT 1+1 FROM DUAL

2    DUAL    DUAL

3 AGE_TYPE
WHERE ROWNUM<=5 *
FROM
AGE_TYPE
WHERE CODE IS NOT NULL
ORDER BY CODE DESC
LIMIT 5 OFFSET 0

4 A.COL2(+) ='A_VALUE2' A.COL2='A_VALUE2'
WHERE (A.COL1=0 OR A.COL1 IS NULL) AND
(A.COL2='A_VALUE2' OR A.COL2 IS NULL)

5 A_COL1,
           A.COL2 A_COL2
FROM A_TABLE A            A.COL2 AS A_COL2
FROM A_TABLE A

6             NVL(SUM(VALUE21),0) FS_VALUE2
FROM   FIELD_SUM            COALESCE(SUM(VALUE21),0) AS FS_VALUE2
FROM   FIELD_SUM

7 �?/font>�?/font> 8 TEST B 9 旉��
问题
SELECT TO_DATE('20010203','YYYY-MM-DD') AS DAY
FROM DUAL

10 SELECT NULL||'-' ||NULL AS VALUES1
FROM DUAL

11    ACCESS_INFO_SUM1_V
WHERE YEARCODE BETWEEN '200305' AND '200505'
GROUP BY SCCODE ROUND(AVG(AIV.BASICCNT)) AS BASICCNT
FROM
    (SELECT SUM(BASICCNT1)      AS BASICCNT
    FROM   ACCESS_INFO_SUM1_V
    WHERE YEARCODE BETWEEN '200305' AND '200505'
    GROUP BY sccode
     ) AIV

12 �?/font> �?/font>�?/font>�c?/font> (注：VALUE4字段�?/font>�?/font>�c?/font> �?/font>�c?/font> (注：VALUE5字段�?/font>�c?/font>�l�果为长度�ؓ零的字符�?/font> 为时间类 (注：VALUE7字段为时间类 13 14 �Ӟ��COL1=NULL

15 创徏函数来解�?/font>
        'SELECT $1 || $2' LANGUAGE 'sql';

16 �?/font> 17 �?/font>        'SELECT date(substr(text($1 +
                interval(''1 month'')),1,7)||''-01'')-1'
        LANGUAGE 'sql';

18 �?/font>        'SELECT to_number((date($1)-
                           date($2)),''999999999'')/31'
        LANGUAGE 'sql';

19 �?/font>   GREATEST(TEXT[]) RETURNS TEXT AS '
DECLARE
   ARRY ALIAS FOR $1;
   GREATEST TEXT;
BEGIN
   GREATEST := ARRY[1];
   FOR I IN 1 .. ARRAY_UPPER(ARRY,1) LOOP
      IF ARRY[I] > GREATEST THEN
        GREATEST := ARRY[I];
      END IF;
   END LOOP;
   RETURN GREATEST;
END;
' LANGUAGE 'PLPGSQL';

SELECT GREATEST( ARRAY['HARRY','HARRIOT','HAROLD'])
AS "Greatest";

20 21 ��L��列名�Q?br /> 处理�Ҏ��用AS +别名

22 23 vv 2008-01-03 14:56 发表评论

oracle数据�c�d��

vv — Tue, 25 Dec 2007 03:04:00 GMT
常用的数据库字段�c�d��如下�Q?

字段�c�d�� 中文说明限制条�g 其它说明
CHAR 固定长度字符�? 最大长�?000 bytes
VARCHAR2 可变长度的字�W�串最大长�?000 bytes 可做索引的最大长�?49
NCHAR �Ҏ��字符集而定的固定长度字�W�串最大长�?000 bytes
NVARCHAR2 �Ҏ��字符集而定的可变长度字�W�串最大长�?000 bytes
DATE 日期�Q�日-�?�q�_�� DD-MM-YY�Q�HH-MI-SS�Q? �l�过严格��试�Q�无千虫问题
LONG ��长字符�? 最大长�?G�Q?31-1�Q? ��_��存储大部头著�?
RAW 固定长度的二�q�制数据最大长�?000 bytes 可存攑֤�媒体图象声音�{?
LONG RAW 可变长度的二�q�制数据最大长�?G 同上
BLOB 二进制数�? 最大长�?G
CLOB 字符数据最大长�?G
NCLOB �Ҏ��字符集而定的字�W�数�? 最大长�?G
BFILE 存放在数据库外的二进制数�? 最大长�?G
ROWID 数据表中记录的唯一行号 10 bytes ********.****.****格式�Q?�?�?
NROWID 二进制数据表中记录的唯一行号最大长�?000 bytes
NUMBER(P,S) 数字�c�d�� P为整��C��Q�S为小��C��
DECIMAL(P,S) 数字�c�d�� P为整��C��Q�S为小��C��
INTEGER 整数�c�d�� 的整数
FLOAT ��点数类�? NUMBER(38)�Q�双�_�ֺ�
REAL 实数�c�d�� NUMBER(63)�Q�精度更�?

�q�些数据�c�d��的数字代码是多少�Q?
如在dbf�?
8 ----CHAR
12 -----NUMERIC

vv 2007-12-25 11:04 发表评论