怎么样通过JDBC操作ORACLE数据库？
怎么样通过JDBC操作ORACLE数据库？
此例子采用JDBC2.0，和ORACLE9i数据库。数据库位于本机上。采用数据库自带的SCOTT模式。
内附有详细的注释，我想我应该不用多讲了吧
import java.sql.*;
import oracle.sql.*;
import oracle.jdbc.pool.OracleDataSource;
public class JdbcOracle {
public static void main(String[] args) {
/**URL格式：drivername:@driver_information
1,drivername主要有以下两种
jdbc:oracle:thin (thin驱动程序)
jdbc:oracle:oci (oci驱动程序)
2,driver_information
host_name:port:database_sid
*/
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
String url = "jdbc:oracle:thin:@localhost:1521:ORADB";
String username = "scott";
String password = "tiger";
try {
/**一、注册驱动程序
方法一Class.forName("oracle.jdbc.OracleDriver");
*/
DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
//二、打开数据库连接
/**方法一，使用oracle数据源对象?
oracle.jdbc.pool.OracleDataSource ds=new oracle.jdbc.pool.OracleDataSource();
ds.setServerName("localhost");
ds.setDatabaseName("ORADB"); //数据库存名
ds.setDriverType("oci");//要使用的JDBC驱动程序（OracleDatasore的扩展）
ds.setURL("jdbc:oracle:thin:@localhost:1521:ORADB"); //指定数据库的URL（OracleDataSource的扩展）
ds.setDataSourceName(""); //底层数据源的名称
ds.setNetworkProtocol("tcp");//用于数据库通信的协议
ds.setPortNumber(1521);//端口号
ds.setUser("scott");
ds.setPassword("tiger");
Connection conn=ds.getConnection();
*/
//方法二、使用Drivermanger
conn = DriverManager.getConnection(url, username, password);
//设置事务提交模式
//conn.setAutoCommit(true);
//若禁止了自动提交模式,那么在关闭Connection对象时会执行一次自动隐式提交,以保证还没有提交的所有DML语句被自动提交
conn.setAutoCommit(false);
//三、创建JDBC Statement对象
stmt = conn.createStatement();
//PreparedStatement pstmt=conn.prepareStatement("带有参数的SQL语句");
//CallableStatement cstmt=conn.prepareCall("调用存储过程的语句");
//四、从数据库获取行
/**select 语句用executeQuery()
insert,update,delete语句用executeUpdate()
若预先不知道要执行的SQL语句类型，那么用execute()
*/
rs = stmt.executeQuery("select id,name,age,sex,birth from employee");
//五、从数据库获取行
while (rs.next()) {
int id = rs.getInt("id");
String name = rs.getString("name");
int age = rs.getInt("age");
String sex = rs.getString("sex");
Date birth = rs.getDate("birth");
}
//rs.close();
//六、向数据库中添加行(注：月份的编码是从0开始的，因此月份1代表2月)
java.sql.Date date = new java.sql.Date(82, 10, 05);
int i = stmt.executeUpdate("insert into employee values" +
"(1,'qds',22,'1',TO_DATE(date,'YYYY,MM,DD'))");
//七、修改数据中的行
int j = stmt.executeUpdate("update employee set age=21 where id=1");
//八、从数据库中删除行
int k = stmt.executeUpdate("delete from employee set id=1");
//九、处理数据库的NULL值方法一:使用结果集对象的wasNull方法判断
conn.commit();
rs = stmt.executeQuery(
"select id,type_id,prod_name from product where id=1");
//此次假设type_id列为Null值
System.out.println("id=" + rs.getInt("id"));
System.out.println("type_id=" + rs.getInt("type_id"));
if (rs.wasNull()) {
System.out.println("type_id was null!");
}
System.out.println("prod_name=" + rs.getString("prod_name"));
//九、处理数据库的NULL值方法二:使用JAVA包装器类.因为JAVA包装器类可以赋于NULL值
//java.lang.Integer typeId=(java.lang.Integer)rs.getObject("type_id");
//System.out.println(typeId);此时typeId的值为Null
//在向数据库插入或更新某一行为NULL值时,也可以使用JAVA包装器对象
//java.lang.Double price=null;
//int ii=stmt.executeUpdate("update products set price="+price+" where id=12");
rs.close();
//十,执行数据定义语言语句(DDL:CREATE,ALTER,DROP)----采用execute()方法执行DDL语句
//执行DDL语句会导致一次隐式提交,因此,如果你在发出DDL语句之前执行了一些未提交的DML语句,那么这些DML语句将被提交
boolean result = stmt.execute("create table customers(" +
"id integer constraint customers_pK primary key," +
"first_name varchar2(10) not null," +
"last_name varchar2(10) not null," +
"dob date," +
"phone varchar2(15)" +
")"
);
if (result == true) {
System.out.println("The table has Created!");
}
else {
System.out.println("The table hasn't Create");
}
//-------------------------------------------------------------------------
}
catch (Exception e) {
System.out.println("error: " + e);
try {
conn.rollback();
}
catch (SQLException sqle) {}
}
finally {
try {
if (rs != null)
rs.close();
}
catch (SQLException sqle) {
System.out.println("SQLState: " + sqle.getSQLState());
System.out.println("SQLErrorCode: 错误代码" + sqle.getErrorCode());
System.out.println("SQLErrorMessage:错误情况的字符串 " + sqle.toString());
}
try {
if (stmt != null)
stmt.close();
}
catch (SQLException sqle1) {
System.out.println("SQLState: " + sqle1.getSQLState());
System.out.println("SQLErrorCode: 错误代码" + sqle1.getErrorCode());
System.out.println("SQLErrorMessage:错误情况的字符串 " + sqle1.toString());
}
try {
if (conn != null)
conn.close();
}
catch (SQLException sqle2) {
System.out.println(sqle2.toString());
System.out.println(sqle2.getSQLState());
System.out.println(sqle2.getErrorCode());
}
}
}
}