if(exists)returnConflict($"""Sticker "{sticker.Title}" already exists."""); 在ISimplifiedDataAccessor中,ExistsAsync方法通过一个Lambda表达式参数来决定数据的筛选条件,于是根据PostgreSqlDataAccessor的实现方式,这里就需要将这个Lambda表达式转换成WHERE子句,从而可以在Dapper上执行SQL语句进行查询。比如,假设上面的...
_json_object_key_value", ERRCODE_DUPLICATE_JSON_OBJECT_KEY_VALUE }, { "invalid_argument_for_sql_json_datetime_function", ERRCODE_INVALID_ARGUMENT_FOR_SQL_JSON_DATETIME_FUNCTION }, { "invalid_json_text", ERRCODE_INVALID_JSON_TEXT }, { "invalid_sql_json_subscript", ERRCODE_INVALID_SQL_JSON...
利用这种外部数据管理机制,我们可以在 PostgreSQL 中访问各种同构数据库(PostgreSQL)、异构数据库(MySQL、Oracle、SQL Server、SQLite、HBase、Cassandra、ClickHouse、CouchDB、MongoDB、Neo4j、Redis、Hadoop、HIve等)以及文本文件(CSV、JSON、XML等) 比如 连接 MySQL 数据库的外部数据包装器:mysql_fdw。mysql_fdw 提供...
ALTER TABLE [ IF EXISTS ] [ ONLY ] name [ * ] action [, ... ] ALTER TABLE [ IF EXISTS ] [ ONLY ] name [ * ] RENAME [ COLUMN ] column_name TO new_column_name ALTER TABLE [ IF EXISTS ] [ ONLY ] name [ * ] RENAME CONSTRAINT constraint_name TO new_constraint_name ALTER TA...
JSON 类型 json 数据类型可以用来存储 JSON(JavaScript Object Notation)数据, 这样的数据也可以存储为 text,但是 json 数据类型更有利于检查每个存储的数值是可用的 JSON 值。 示例: CREATE TABLE test( id serial NOT NULL PRIMARY KEY , info json NOT NULL ...
pushJsonbValue(&parse_state, WJB_BEGIN_OBJECT, NULL); ts_jsonb_add_int32(parse_state, POL_RETENTION_CONF_KEY_HYPERTABLE_ID, hypertable->fd.id); switch (window_type) { case INTERVALOID: if (created_before) ts_jsonb_add_interval(parse_state, POL_RETENTION_CONF_KEY_DROP_CREATED_BEFORE,...
Primary Key Foreign Key CHECK Constraint UNIQUE Constraint NOT NULL Constraint DEFAULT Constraint PostgreSQL Data Types Boolean CHAR, VARCHAR, and TEXT NUMERIC DOUBLE PRECISION REAL Integer SERIAL DATE TIMESTAMP Interval TIME UUID JSON HSTORE Array User-defined Data Types...
IsNotEmptyUtil { public static boolean isEmpty(Object object) { if (object == null) { return (true); } if ("".equals(object)) { return (true); } if ("null".equals(object)) { return (true); } return (false); } public static boolean isNotEmpty(Object object) { if (object !
package testzorm import ( "time" "gitee.com/chunanyong/zorm" ) // 建表语句 /* DROP TABLE IF EXISTS `t_demo`; CREATE TABLE `t_demo` ( `id` varchar(50) NOT NULL COMMENT '主键', `userName` varchar(30) NOT NULL COMMENT '姓名', `password` varchar(50) NOT NULL COMMENT '密码', ...
$part_init_callback$(argsJSONB)RETURNSVOID传入参数如下/* RANGE-partitioned table abc (for exp: child abc_4) */{ "parent": "abc", "parttype": "2", "partition": "abc_4", "range_max": "401", "range_min": "301" }/* HASH-partitioned table abc (for exp: child abc_0) */...