CREATE FUNCTION decode_oracle(pattern VARCHAR(255),string_a VARCHAR(255),string_b VARCHAR(255),string_c VARCHAR(255)) RETURNS varchar(255) BEGIN DECLARE result VARCHAR(255) DEFAULT ""; #正常对比函数 if pattern=string_a then set result = string_b; ELSEIF pattern=string_b then set result ...
send("my-topic", convertToKafkaMessage(entity)); } private String convertToKafkaMessage(MyEntity entity) { // 转换实体为 JSON 或其他格式 return new Gson().toJson(entity); } } 步骤三:消费消息更新 ES 编写一个消费者服务,从消息队列中读取变更事件,并更新 ES。 示例代码(使用 Kafka): // 假设...
string name = item["Name"].ToString(); string sex = item["Sex"].ToString(); int age = int.Parse(item["Age"].ToString()); string phoneNumber = item["PhoneNumber"].ToString(); } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21...
UPDATE table_name SET field1=new-value1, field2=new-value2 [WHERE Clause] 实例: UPDATE User SET user_sex='女' where user_name='admin'; 更新数据行 11、删除数据行 语法 DELETE FROM table_name [WHERE Clause] 实例: DELETE FROM User WHERE user_name='admin'; 删除数据行 12、模糊查询LIKE ...
text, -> fulltext(title, body) with parser ngram -> ) -> ;插入数据，插入数据库时可能会遇到的问题：ERROR 1366 (HY000): Incorrect string value: '\xCA\xFD\xBE\xDD' for column 'title' at row 1编码方式有问题，默认好像为拉丁文解决方式一：alter table articles convert to charset...
| COMMENT [=] 'string' | CONNECTION [=] 'connect_string' | DATA DIRECTORY [=] 'absolute path to directory' | DELAY_KEY_WRITE [=] {0 | 1} | INDEX DIRECTORY [=] 'absolute path to directory' | INSERT_METHOD [=] { NO | FIRST | LAST }...
(%.*s) given to %s • Error number: 1244; Symbol: ER_CORRUPT_HELP_DB; SQLSTATE: HY000 Message: Help database is corrupt or does not exist • Error number: 1246; Symbol: ER_AUTO_CONVERT; SQLSTATE: HY000 Message: Converting column '%s' from %s to %s • Error number: 1247; ...
go/src/database/sql/convert.go 代码语言:txt AI代码解释 case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: if src == nil { return fmt.Errorf("converting NULL to %s is unsupported", dv.Kind()) } s := asString(src) i64, err := strconv.ParseInt(s, 10...
set_int() : Item_param, String set_int32() : log_attribute_t set_int64() : log_attribute_t set_interface_user() : Sql_service_command_interface set_interval_field() : dd::Event, dd::Event_impl set_interval_field_null() : dd::Event, dd::Event_impl set_interval_value() : dd:...
错误号:1246; 符号: ER_AUTO_CONVERT; SQLSTATE: HY000 消息:将列“%s”从%s转换为%s 错误号:1247; 符号: ER_ILLEGAL_REFERENCE; SQLSTATE: 42S22 消息:不支持引用'%s'(%s) 错误号:1248; 符号: ER_DERIVED_MUST_HAVE_ALIAS; SQLSTATE:42000