Spring queryforint method: int type single value query

Grammar 1

queryForInt(String sql)

Example

public int getUserCount(){
  String sql = "SELECT count(*)FROM tb_user";  //创建一条sql语句
  int count = getJdbcTemplate().queryForInt(sql);  //执行sql语句，把查询的结果赋值给一个int类型变量
  return count;
}

Grammar 2

queryForInt(String sql,Object[] args)

Example

public int getUserCount(){
  String sql = "SELECT count(*)FROM tb_user WHERE sex=?and age=?";  //创建一条sql语句
  Object[] args = {"男",27};
  int count = getJdbcTemplate().queryForInt(sql,args);  //执行sql语句
  return count;
}