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=str
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...
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 ...
INSTR (string ,substring )//返回substring首次在string中出现的位置,不存在返回0 LCASE (string2 ) //转换成小写 LEFT (string2 ,length ) //从string2中的左边起取length个字符 LENGTH (string ) //string长度 LOAD_FILE (file_name ) //从文件读取内容 LOCATE (substring , string [,start_position ] ...
Type String A hint about which client-side authentication plugin to use. See Section 6.2.13, “Pluggable Authentication”. --default-character-set=charset_name Command-Line Format --default-character-set=charset_name Type String Use charset_name as the default character set for the client and...
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:...
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 }...
import java.sql.* import java.util.* import javax.sql.DataSource @Service class Mysql2OdpsService {...fields = getTableFields(table, dataSource) return ddl(table, fields) } /** * 获取数据库全部表...rs.getString("TABLE_NAME")) } } catch (e: Exception) { logger.error("获取数据库全...