通過JDBC操作ORACLE數據庫實例詳解
此例子採用JDBC2.0，和ORACLE9i數據庫。數據庫位於本機上。採用數據庫自帶的SCOTT模式。
內附有詳細的註釋，我想我應該不用多講了吧
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驅動程序)
jdbc:oracle:oci (oci驅動程序)
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、註冊驅動程序
方法一Class.forName("oracle.jdbc.OracleDriver";
*/
DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
//二、打開數據庫連接
/**方法一，使用oracle數據源對象?
oracle.jdbc.pool.OracleDataSource ds=new oracle.jdbc.pool.OracleDataSource();
ds.setServerName("localhost";
ds.setDatabaseName("ORADB"; //數據庫存名
ds.setDriverType("oci"; //要使用的JDBC驅動程序（OracleDatasore的擴展）
ds.setURL("jdbc:oracle:thin:@localhost:1521:ORADB"; //指定數據庫的URL（OracleDataSource的擴展）
ds.setDataSourceName(""; //底層數據源的名稱
ds.setNetworkProtocol("tcp";//用於數據庫通信的協議
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);
//設置事務提交模式
//conn.setAutoCommit(true);
//若禁止了自動提交模式,那麼在關閉Connection對象時會執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、創建JDBC Statement對象
stmt = conn.createStatement();
//PreparedStatement pstmt=conn.prepareStatement("帶有參數的SQL語句";
//CallableStatement cstmt=conn.prepareCall("調用存儲過程的語句";
//四、從數據庫獲取行
/**select 語句用executeQuery()
insert,update,delete語句用executeUpdate()
若預先不知道要執行的SQL語句類型，那麼用execute()
*/
rs = stmt.executeQuery("select id,name,age,sex,birth from employee";
//五、從數據庫獲取行
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、向數據庫中添加行(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、修改數據中的行
int j = stmt.executeUpdate("update employee set age=21 where id=1";
//八、從數據庫中刪除行
int k = stmt.executeUpdate("delete from employee set id=1";
//九、處理數據庫的NULL值方法一:使用結果集對象的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type_id列爲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、處理數據庫的NULL值方法二:使用JAVA包裝器類.因爲JAVA包裝器類可以賦於NULL值
//java.lang.Integer typeId=(java.lang.Integer)rs.getObject("type_id";
//System.out.println(typeId);此時typeId的值爲Null
//在向數據庫插入或更新某一行爲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,執行數據定義語言語句(DDL:CREATE,ALTER,DROP)----採用execute()方法執行DDL語句
//執行DDL語句會導致一次隱式提交,因此,如果你在發出DDL語句之前執行了一些未提交的DML語句,那麼這些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());
}
}
}
}