getGeneratedKeys自动获取主键的方法

public class Demo
{

public static void main(String[] args) {

try {
String sql="insert into person values(?,?)";
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection conn=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=pubs","sa","");

//需要增加一个Statement.RETURN_GENERATED_KEYS这样的参数
java.sql.PreparedStatement p=conn.PreparedStatement(sql,Statement.RETURN_GENERATED_KEYS);
p.setObject(1, "zengguofeef");

//p.setObject(2, new java.sql.Date(System.currentTimeMillis()));

//必须这样设置,System.currentTimeMillis()表示当前系统时间的毫秒数,Timestamp()方法会根据这个毫秒数设置成当前时间
p.setTimestamp(2, new java.sql.Timestamp(System.currentTimeMillis()));
p.executeUpdate();


//通过这个方法获取getGeneratedKeys();
ResultSet rs=p.getGeneratedKeys();
rs.next();
int num=rs.getInt(1);
System.out.println("自动增长列为:"+num);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}



public static void main(String[] args)
{

//在sql语句后面加上一个select scope_identity()
String sql="insert into person values(?,?) select scope_identity()";
try {
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
Connection conn=DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;databaseName=pubs","sa","");
java.sql.PreparedStatement p=conn.prepareStatement(sql);
p.setObject(1, "zengguofeef");
p.setTimestamp(2, new java.sql.Timestamp(System.currentTimeMillis()));
//这里使用的是executeQuery()方法,而不是executeUpdate()
ResultSet rs=p.executeQuery();
rs.next();
int num=rs.getInt(1);
System.out.println("自动增长列为:"+num);
conn.close();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}
}