很多数据库的初学者学了不少sql语句，却知道在程序里怎么执行他们，这里以java为例，介绍一下java的嵌入sql语句

1.简单的链接数据库：

import java.sql.Connection;

import oracle.jdbc.pool.OracleDataSource;

public class TestConnection2 {

public static void main(String[] args)throws Exception {

OracleDataSource ods = new OracleDataSource();

//  ods.setURL("jdbc:oracle:thin:@localhost:1521:orcl");

//  ods.setUser("scott");

//  ods.setPassword("tiger");

ods.setURL("jdbc:oracle:thin:scott/123@localhost:1521:orcl");

Connection conn = ods.getConnection();

System.out.println("连接成功，连接为："+conn);

conn.close();

}

}

2.嵌入sql语句(假设有张表emp，有属性：empno，ename等)：

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

public class TestConnection {

public static void main(String[] args)throws ClassNotFoundException,SQLException {

//4要素

String driverName = "oracle.jdbc.driver.OracleDriver";

driverName = "oracle.jdbc.OracleDriver";

String url = "jdbc:oracle:thin:@localhost:1521:orcl";

String username = "scott";

String password = "123";

//注册驱动获得连接

Class.forName(driverName);

Connection conn = DriverManager.getConnection(url,username,password);

//获得语句对象

Statement stmt = conn.createStatement();

//发送sql语句

String sql = "select empno,ename,sal from emp";

ResultSet rs = stmt.executeQuery(sql);

//解析结果

while(rs.next()){

String empno = rs.getString(1);

String ename = rs.getString("ename");

String sal = rs.getString(3);

System.out.println(empno+" "+ename+" "+sal);

}

rs.close();

stmt.close();

conn.close();

}

}