Java开发中JDBC连接数据库步骤及代码

1、加载驱动 Class.forName(“驱动”);

2、连接数据库 Connection con = DriverManager.getConnection(url , username , password ) ;

3、创建一个Statement Statement stmt = con.createStatement() ; 或者PreparedStatement pstmt = con.prepareStatement(sql) ;

4、执行SQL语句 ResultSet rs = stmt.ececuteQuery("select * from ......");

5、处理结果 while(rs.next()){ String name = rs.getString("name"); 或者 String name = rs.getString(1); }

6、关闭jdbc对象 rs.close(); stmt.close(); con.close();

示例：

连接oracle数据库

public class ConnOracle {

public static void main(String[] args) {

Connection conn = null;

Statementstmt = null;

ResultSet rs= null;

try {

Class.forName("oracle.jdbc.driver.OracleDriver");

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

String user = "system";

String psaaword ="12345";

conn = DriverManager.getConnection(url, usern,password);

stmt =conn.createStatement();

rs = stmt.executeQuery("select * from ruby");

while (rs.next()){

System.out.println(rs.getString("sid") +" "+rs.getString("sname"));

}

//添加数据用executeUpdate

//stmt.executeUpdate("insert into ss values(7,'张三')");

//修改数据用executeUpdate

//stmt.executeUpdate("update ss set name = '张四' where id =5");

//删除 数据用executeUpdate

//stmt.executeUpdate("delete from ss where id = 6");

} catch(Exception e) {

e.printStackTrace();

} finally{

try {

if(rs != null){ rs.close(); }

if(stmt != null){ stmt.close(); }

if(con != null){ con.close(); }

} catch (SQLException e) {

e.printStackTrace();

}

}

}

}

连接mySql数据库

public class ConnMySQL {

public static void main(String[] args) {

Connection conn=null;

PreparedStatement pre =null;

ResultSet rs= null;

try {

Class.forName("com.mysql.jdbc.Driver");

conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","user","password"); //jdbc:mysql://host:port/database

pre = conn.prepareStatement("select * from User where name=?");

pre.setString(1,"zhangsan");

rs=pre.executeQuery();

while (rs.next()){

System.out.println(rs.getString("sid") +" "+rs.getString("sname"));

}

} catch (Exception e){

e.printStackTrace();

}finally{

try {

if(rs != null){ rs.close(); }

if(stmt != null){ stmt.close(); }

if(con != null){ con.close(); }

} catch (SQLException e) {

e.printStackTrace();

}

}

}

}

连接SqlServer数据库

Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");

Connection con = DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=test","user","password");

将驱动、url、userName、password替换即可