使用MyBatis类型转换器实现int转String 下面是一个使用MyBatis类型转换器实现int转String的示例: publicclassUser{privateintid;privateStringname;// getters and setters}publicinterfaceUserMapper{@Select("SELECT id, name FROM users")@Results({@Result(property="id",column="id",typeHandler=IntegerToStringTypeH...
private int id; private String username; private String hashedPassword; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String ...
int updateResponse(@Param("id")long id, @Param("response")String response, @Param("updateTime")LocalDateTime updateTime); 第二步,我们查看了Mapper方法对应的XML文件,如下代码段所示,对应的parameterType类型是String,而实际参数的类型包括long、String以及LocalDateTime。 <update id="updateResponse" parameterTyp...
@SpringBootApplication @MapperScan("com.example.mybatis.mapper") public class MybatisApplication { public static void main(String[] args) { SpringApplication.run(MybatisApplication.class, args); } } 7. mysql 表结构 CREATE TABLE `user` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `...
String sql="SELECT id,user_name from t_user where id = ?";stmt=conn.prepareStatement(sql);// 占位符赋值stmt.setInt(1,2);ResultSet rs=stmt.executeQuery();// 获取结果集 结果集映射while(rs.next()){Integer id=rs.getInt("id");String userName=rs.getString("user_name");user.setId(id...
<where><iftest="status != null">and status=#{status,jdbcType=INTEGER}</if></where> 解决方式2: 代码语言:javascript 复制 <where><iftest="status != null and status !='' or status==0">and status=#{status,jdbcType=INTEGER}</if></where> 解决方式3: 将0转化为String类型...
public class DateToStringTypeHandler implements TypeHandler<Date> { private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); @Override public void setParameter(PreparedStatement ps, int i, Date parameter, JdbcType jdbcType) throws SQLException { ps.setString(i, sdf.format(paramet...
public interface TypeHandler<T> {/*** 入库前的类型转换*/void setParameter(PreparedStatement ps, int i, T parameter, JdbcType jdbcType) throws SQLException;/*** 得到结果。* 查询后的数据处理*/T getResult(ResultSet rs, String columnName) throws SQLException;T getResult(ResultSet rs...
*/void setParameter(PreparedStatementps, int i,Tparameter,JdbcTypejdbcType)throwsSQLException;/** *从ResultSet获取结果时,将数据由java类型转换成jdbc类型 * * @param columnName 列名 */TgetResult(ResultSetrs,StringcolumnName)throwsSQLException;/** ...