JDBC（oracle11g）

環境：jdk1.7+oracle11g

1.創建java工程

2.在oracle安裝目錄下找到jdbc/lib/ojdbc6.jar

3.將jar包導入工程，點擊工程 - 右鍵 - Build Path - Add External Archives，選擇ojdbc6.jar

4.在oracle中創建一張表

5.在工程中創建class，例如爲：Demo.java

6.加載OracleDriver類：Class.forName("oracle.jdbc.driver.OracleDriver");

Class.forName()的作用是要求JVM查找並加載指定的類，即JVM會執行該類的靜態代碼段，OracleDriver的靜態代碼中實例化了DriverManager

7.創建數據庫連接：DriverManager.getConnection("jdbc:oracle:thin:@192.168.1.208:1521:orcl", username, password);

8.創建Statement：stmt = conn.createStatement();

Statement 對象用於執行一條靜態的 SQL 語句並獲取它產生的結果

以下爲測試程序代碼:

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Demo {
	
	static{
		try {
			Class.forName("oracle.jdbc.driver.OracleDriver");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}
	
	private Connection conn;	
	private Statement stmt;//Statement 對象用於執行一條靜態的 SQL 語句並獲取它產生的結果
	private ResultSet rs;
	
	public void connectOracle(String username,String password){
		try {
			conn = DriverManager.getConnection("jdbc:oracle:thin:@192.168.1.208:1521:orcl", username, password);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		
		try {
			stmt = conn.createStatement();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	public boolean executeNoQuery(String sql){
		try {
			return stmt.execute(sql);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return false;
	}
	
	public ResultSet executeQuery(String sql){
		this.rs = null;
		try {
			rs=stmt.executeQuery(sql);			
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return rs;
	}

	public void close(){
		try {
			rs.close();
			stmt.close();
			conn.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}			
	}
	public static void main(String[] args) {
		Demo test = new Demo();
		test.connectOracle("ida", "ida");
		String mySql="SELECT t.yhmc,t.xb FROM BASE_USER t";
		ResultSet r = test.executeQuery(mySql);		
		try {
			while(r.next()){
				String yhmc = r.getString("yhmc");
				String xb = r.getString("xb");
				
				System.out.println(yhmc+"---"+xb);
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}

	}

}