oracle代码怎么写,oracle教程 菜鸟教程
java 实现 jdbc连接oracle 数据库的java代码怎么写
package com.jdbc.test;
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import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class JDBCTest {
public static void main(String[] args) throws Exception {
//1.加载驱动
//Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
//Class.forName("com.mysql.jdbc.Driver");
Class.forName("oracle.jdbc.driver.OracleDriver");
//2.创建数据库连接对象
//Connection conn = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=db","sa","sqlpass");
//Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/db?useUnicode=truecharacterEncoding=UTF-8","root","123456");
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl","scott","Oracle123");
//3.创建数据库命令执行对象
Statement stmt = conn.createStatement();
// PreparedStatement ps = conn.prepareStatement("select * from t_user");
//4.执行数据库命令
ResultSet rs = stmt.executeQuery("select * from t_user");
// ResultSet rs = ps.executeQuery();
//5.处理执行结果
while (rs.next()) {
int id = rs.getInt("id");
String username = rs.getString("username");
String password = rs.getString("password");
System.out.println(id + "\t" + username + "\t" + password);
}
//6.释放数据库资源
if (rs != null) {
rs.close();
}
// if (ps != null) {
// ps.close();
// }
if (stmt != null) {
stmt.close();
}
if (conn != null) {
conn.close();
}
}
}
这是以前写的3中数据库的链接已经测试过了。
oracle按条件进行循环的代码怎么编写
begin
v_cnt number:=0;
loop
delete from a where rownum=100000;
v_cnt:=SQL%ROWCOUNT;
commit;
exit when v_cnt=0;
end loop;
end;
java 连接oracle rac c3p0代码怎么写
不是很懂你的意思
c3p0连接数据库跟连接其他的数据库是一样的啊
配置数据源，绑定数据源，再就是与其他的框架整合的问题
数据源配置：
driverClass=oracle.jdbc.driver.OracleDriver
jdbcUrl=jdbc:oracle:thin:@localhost:1521:orcl
user=sys
password=sun123
c3p0配置：
!-- c3p0 --
bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
property name="driverClass" value="${driverClass}"/
property name="jdbcUrl" value="${jdbcUrl}"/property
property name="user" value="${user}" /
property name="password" value="${password}"/
/bean
oracle数据库求写完整代码
6
declare
s int;
begin
s := 1;
for s in 1 .. 100 loop
if s = 33 or s = 74 or s = 96 then
null;
else
dbms_output.put_line(s);
end if;
end loop;
end;
7没看懂
8
declare
n int;
s int;
begin
n := 1;
s := 0;
for n in 1 .. 100 loop
if mod(n, 2) = 1 then
s := s + n;
else
null;
end if;
end loop;
dbms_output.put_line(s);
end;
SOS!!!怎样写连接ORACLE数据库的代码？
============ORACLE 8i============================
Class.forName ("oracle.jdbc.driver.OracleDriver");
Connection conn =
DriverManager.getConnection ("jdbc:oracle:thin:@myhost:1521:orcl",
"scott", "tiger");
=============MySQL=================================
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
conn = DriverManager.getConnection("jdbc:mysql://myhost:3306/dbname","user","passwd");
============InfoMax================================
Class.forName("com.informix.jdbc.IfxDriver");
conn = DriverManager.getConnection("jdbc:informix-sqli://myhost:1533:informixserver=myserver;user=rdtest;password=test");
============InforMix================================
Class.forName("com.informix.jdbc.IfxDriver");
conn = DriverManager.getConnection("jdbc:informix-sqli://myhost:1533:informixserver=myserver;user=rdtest;password=test");
=============SQLServer2000=========================
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
Connection conn = DriverManager.getConnection
("jdbc:microsoft:sqlserver://server1:1433","username","password");
///////////////////////////////////
jdbc driver download:
SQLServer:
MySQL:
Oracle:
---------------------DB2--------------------
--------------------- --------------------
Class.forName("COM.ibm.db2.jdbc.app.DB2Driver").newInstance();//For Application
String url = "jdbc:db2:sample";
con = DriverManager.getConnection(url, userid, passwd);
Class.forName("COM.ibm.db2.jdbc.net.DB2Driver").newInstance();//For Applet
String url = "jdbc:db2:// "+server+":"+port+"/sample";
con = DriverManager.getConnection(url, userid, password );
补充oracle的连接方法：
DriverManager.registerDriver (new OracleDriver());
Connection conn73 = DriverManager.getConnection
("jdbc:oracle:oci8:@ora8idev","scott","tiger");
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