Spring jdbc 两方法分析 博客分类: SpringJava springjavajdbc
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2024-03-24 09:28:28
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1.
List<User> rsList = jdbcTemplate.queryForList(sql,User.class, username);
2
List<User> userList = jdbcTemplate.query(sql, new Object[]{username}, new BeanPropertyRowMapper<User>(User.class));
方法一: error:
org.springframework.jdbc.IncorrectResultSetColumnCountException: Incorrect column count: expected 1, actual 3
原因:
jdbcTemplate.queryForObject(sql, requiredType) 中的requiredType应该为基础类型,和String类型。
public <T> List<T> queryForList(String sql, Class<T> elementType, Object... args) throws DataAccessException Description copied from interface: JdbcOperations Query given SQL to create a prepared statement from SQL and a list of arguments to bind to the query, expecting a result list. The results will be mapped to a List (one entry for each row) of result objects, each of them matching the specified element type. Specified by: queryForList in interface JdbcOperations Parameters: sql - SQL query to execute elementType - the required type of element in the result list (for example, Integer.class) args - arguments to bind to the query (leaving it to the PreparedStatement to guess the corresponding SQL type); may also contain SqlParameterValue objects which indicate not only the argument value but also the SQL type and optionally the scale Returns: a List of objects that match the specified element type Throws: DataAccessException - if the query fails