Java_jdbc 基础笔记之九 数据库连接 （查询Customer对象的方法）

/**
*
* 写一个查询Customer对象的方法
*
*/
public Customer getCustomer(String sql, Object... args) {
Customer customer = null;
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
conn = JDBCTools.getConnection();
ps = conn.prepareStatement(sql);
// 填充占位符
for (int i = 0; i < args.length; i++) {
ps.setObject(i + 1, args[i]);
}
rs = ps.executeQuery();
if (rs.next()) {
customer = new Customer();
customer.setId(rs.getInt(1));
customer.setName(rs.getString(2));
customer.setEmail(rs.getString(3));
customer.setBirth(rs.getDate(4));

}

} catch (Exception e) {
e.printStackTrace();
} finally {
JDBCTools.close(rs, ps, conn);
}

return customer;

}
@Test
public void testGet1(){
String sql="SELECT id,name,email,birth FROM customers where id=?";
Customer cust=getCustomer(sql,3);
System.out.println(cust);

}