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| jdbc获取的时间是java.sql.Date、java.sql.Timestamp。不是java程序中使用的java.util.Date | |
| java.sql.Date只包含年月日信息，时分秒毫秒都会清零。格式类似：YYYY-MM-DD | |
| jdbc时间读取 vs 数据库表字段关系： | |
| 1: 如果数据库中是datetime类型，那么如果应用getString("writerDate") 有小时，分钟，秒 | |
| 2: 如果数据库中是datetime类型，那么如果应用getDate("writerDate") 没有小时，分钟，秒 | |
| 3: 如果数据库中是datetime类型，那么如果应用getTimestamp("writerDate") 有小时，分钟，秒 | |
| 4: 如果数据库中是String类型，那么如果应用getTimestamp("writerDate") 报错 | |
| 5: 如果数据库中是String类型，那么如果应用getString("writerDate") 有小时，分钟，秒 | |
| 6: 如果数据库中是String类型，那么如果应用getDate("writerDate") 报错 | |
| 错误的转换 | |
| String gc_1 = resultSet.getString("writerDate");//2019-02-22 10:48:53 | |
| java.sql.Date gc_2 = resultSet.getDate("writerDate");//2019-02-22 | |
| java.sql.Time gc_3 = resultSet.getTime("writerDate");//10:48:53 | |
| java.sql.Timestamp gc_4 = resultSet.getTimestamp("writerDate");//2019-02-22 10:48:53.0 | |
| 正确的转换 | |
| java.sql.Timestamp timeStemp = resultSet.getTimestamp("writerDate");//2019-02-22 10:48:53.0 | |
| java.util.Date gc_4 = new java.util.Date(timeStemp.getTime());//Fri Feb 22 10:48:53 CST 2019 |
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