Java JDBC连接Oracle

1. 安装Oracle数据库，我这里使用的是Oracle 12c

2. 创建Java工程 connection-oracle

注意：使用的JavaSE-1.8

3. 在Oracle的安装目录里，将djdbc8.jar 拷贝到java工程

路径为：C:apporacleproduct12.2.0dbhome_1jdbclib

4. 创建连接Oracle的java类

public class OracleJdbcTest {
	//数据库连接对象
	private static Connection conn = null;
	
	private static String driver = "oracle.jdbc.driver.OracleDriver"; //驱动
	
	private static String url = "jdbc:oracle:thin:@//127.0.0.1:1521/orcl"; //连接字符串
	
	private static String username = "system"; //用户名
	
	private static String password = "123456"; //密码
	
	
	// 获得连接对象
	private static synchronized Connection getConn(){
		if(conn == null){
			try {
				Class.forName(driver);
				conn = DriverManager.getConnection(url, username, password);
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			}catch (SQLException e) {
				e.printStackTrace();
			}
		}
		return conn;
	}
	
	//执行查询语句
	public void query(String sql, boolean isSelect) throws SQLException{
		PreparedStatement pstmt;
		
		try {
			pstmt = getConn().prepareStatement(sql);
			//建立一个结果集，用来保存查询出来的结果
			ResultSet rs = pstmt.executeQuery();
			while (rs.next()) {
				String name = rs.getString("name");
				System.out.println(name);
			}
			rs.close();
			pstmt.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	public void query(String sql) throws SQLException{
		PreparedStatement pstmt;
		pstmt = getConn().prepareStatement(sql);
		pstmt.execute();
		pstmt.close();
	}
	
	
	//关闭连接
	public void close(){
		try {
			getConn().close();
			
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
}

　　

5. 创建调用类

public class ConnOracle {
	public static void main(String[] args) throws SQLException {
		OracleJdbcTest test = new OracleJdbcTest();
		try {
			test.query("drop table student");
		} catch (SQLException e) {}
		
		test.query("create table student(id int, name nchar(20))");
		
		test.query("insert into student values(1,'zhangsan')");
		
		test.query("insert into student values(2,'lisi')");
		
		test.query("select * from student", true);
		
		test.close();
	}
}

　　

6. 显示结果