SQL 複製 SELECT JSON_ARRAY('a', JSON_OBJECT('name':'value', 'type':1)) 結果JSON 複製 ["a",{"name":"value","type":1}] 範例6下列範例會傳回具有三個元素的 JSON 陣列。 一個元素包含 JSON 字串,另一個元素包含 JSON 物件,而另一個元素包含 JSON 陣列。SQL 複製 ...
get_json_object('{"name":"依琳","age":16}', '$.age') user_age; 1. 2. get_json_object解析json多个字段有很多会太麻烦,可以使用 json_tuple。 2、json_tuple 语法: json_tuple(json_string, k1, k2 ...) 说明:解析json的字符串json_string,可指定多个json数据中的key,返回对应的value。如果输...
class MyJdbcSink(sql:String ) extends RichSinkFunction[Array[Any]] { val driver="com.mysql.jdbc.Driver" val url="jdbc:mysql://localhost:3306/sensor?useSSL=false" val username="root" val password="123456" val maxActive="20" var connection:Connection=null; //创建连接 override def open(par...
sqlstring := sqlstring + ' insert into ' + tablename + '('; ajsonobject := ajsonarray.Get(i) as TJSONObject; for j := 0 to ajsonobject.Size - 1 do begin afieldname := ajsonobject.Pairs[j].JsonString.ToString; sqlstring := sqlstring + ReplaceStr(afieldname, '"', '') ...
(parameter.toJSONString())); } /** * 根据列名,获取可以为空的结果 * * @param rs * @param columnName * @return * @throws SQLException */ @Override public JSONObject getNullableResult(ResultSet rs, String columnName) throws SQLException { String sqlJson = rs.getString(columnName); if (...
SQL 複製 > SELECT json_array_length('[1,2,3,4]'); 4 > SELECT json_array_length('[1,2,3,{"f1":1,"f2":[5,6]},4]'); 5 > SELECT json_array_length('[1,2'); NULL 相關函數json_object_keys函式 :算子 json_array_length函式 json_tuple 數據表值產生器函式 fro...
mybatis用于bean和mysql字段映射,针对字段类型为JSONObject和JSONArray方式使用 ArrayTypeHandler: import java.sql.CallableStatement; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import com.alibaba.fastjson.JSONArray; import org.apache.ibatis.type.BaseTypeHandler; ...
JSON_OBJECTAGG JSON_PATH_EXISTS JSON_QUERY JSON_VALUE Mathematical Logical Metadata Ranking Replication Security String System System Statistical Text & Image Trigger Language elements Queries Statements PDF डाउनलोड करें ...
Forexpr, you can specify any SQL expression that evaluates to a JSON object, a JSON array, a numeric literal, a text literal, or null. This function converts a numeric literal to a JSON number value and a text literal to a JSON string value. ...
Azure SQL Database Azure SQL Managed Instance Constructs a JSON array from an aggregation of SQL data or columns. To create a JSON object from an aggregate instead, useJSON_OBJECTAGG. Nóta Bothjsonaggregate functionsJSON_OBJECTAGGandJSON_ARRAYAGGare currently in preview for Azure SQL Database ...