此例子采用JDBC2.0,和ORACLE9i數(shù)據(jù)庫。數(shù)據(jù)庫位于本機(jī)上。采用數(shù)據(jù)庫自帶的SCOTT模式。
內(nèi)附有詳細(xì)的注釋,我想我應(yīng)該不用多講了吧
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主要有以下兩種
jdbc:oracle:thin (thin驅(qū)動程序)
jdbc:oracle:oci (oci驅(qū)動程序)
2,driver_information
host_nameort: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、注冊驅(qū)動程序
方法一Class.forName("oracle.jdbc.OracleDriver";
*/
DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
//二、打開數(shù)據(jù)庫連接
/**方法一,使用oracle數(shù)據(jù)源對象?
oracle.jdbc.pool.OracleDataSource ds=new oracle.jdbc.pool.OracleDataSource();
ds.setServerName("localhost";
ds.setDatabaseName("ORADB"; //數(shù)據(jù)庫存名
ds.setDriverType("oci"; //要使用的JDBC驅(qū)動程序(OracleDatasore的擴(kuò)展)
ds.setURL("jdbc:oracle:thin:@localhost:1521:ORADB"; //指定數(shù)據(jù)庫的URL(OracleDataSource的擴(kuò)展)
ds.setDataSourceName(""; //底層數(shù)據(jù)源的名稱
ds.setNetworkProtocol("tcp";//用于數(shù)據(jù)庫通信的協(xié)議
ds.setPortNumber(1521);//端口號
ds.setUser("scott";
ds.setPassword("tiger";
Connection conn=ds.getConnection();
*/
//方法二、使用Drivermanger
conn = DriverManager.getConnection(url, username, password);
//設(shè)置事務(wù)提交模式
//conn.setAutoCommit(true);
//若禁止了自動提交模式,那么在關(guān)閉Connection對象時會執(zhí)行一次自動隱式提交,以保證還沒有提交的所有DML語句被自動提交
conn.setAutoCommit(false);
//三、創(chuàng)建JDBC Statement對象
stmt = conn.createStatement();
//PreparedStatement pstmt=conn.prepareStatement("帶有參數(shù)的SQL語句";
//CallableStatement cstmt=conn.prepareCall("調(diào)用存儲過程的語句";
//四、從數(shù)據(jù)庫獲取行
/**select 語句用executeQuery()
insert,update,delete語句用executeUpdate()
若預(yù)先不知道要執(zhí)行的SQL語句類型,那么用execute()
*/
rs = stmt.executeQuery("select id,name,age,sex,birth from employee";
//五、從數(shù)據(jù)庫獲取行
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、向數(shù)據(jù)庫中添加行(注:月份的編碼是從0開始的,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、修改數(shù)據(jù)中的行
int j = stmt.executeUpdate("update employee set age=21 where id=1";
//八、從數(shù)據(jù)庫中刪除行
int k = stmt.executeUpdate("delete from employee set id=1";
//九、處理數(shù)據(jù)庫的NULL值方法一:使用結(jié)果集對象的wasNull方法判斷
conn.commit();
rs = stmt.executeQuery(
"select id,type_id,prod_name from product where id=1";
//此次假設(shè)type_id列為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、處理數(shù)據(jù)庫的NULL值方法二:使用JAVA包裝器類.因?yàn)镴AVA包裝器類可以賦于NULL值
//java.lang.Integer typeId=(java.lang.Integer)rs.getObject("type_id";
//System.out.println(typeId);此時typeId的值為Null
//在向數(shù)據(jù)庫插入或更新某一行為NULL值時,也可以使用JAVA包裝器對象
//java.lang.Double price=null;
//int ii=stmt.executeUpdate("update products set price="+price+" where id=12";
rs.close();
//十,執(zhí)行數(shù)據(jù)定義語言語句(DDL:CREATE,ALTER,DROP)----采用execute()方法執(zhí)行DDL語句
//執(zhí)行DDL語句會導(dǎo)致一次隱式提交,因此,如果你在發(fā)出DDL語句之前執(zhí)行了一些未提交的DML語句,那么這些DML語句將被提交
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: 錯誤代碼" + sqle.getErrorCode());
System.out.println("SQLErrorMessage:錯誤情況的字符串 " + sqle.toString());
}
try {
if (stmt != null)
stmt.close();
}
catch (SQLException sqle1) {
System.out.println("SQLState: " + sqle1.getSQLState());
System.out.println("SQLErrorCode: 錯誤代碼" + sqle1.getErrorCode());
System.out.println("SQLErrorMessage:錯誤情況的字符串 " + 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());
}
}
}
}
Tags:jdbc
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