这两个查询都会将json_column字段中的JSON数据转换为字符串,并将结果列命名为json_string。 执行SQL查询并验证结果: 在PostgreSQL客户端或任何SQL查询工具中执行上述查询,并验证结果是否符合预期。 此外,如果你需要将一个不是JSON格式的数据转换为JSON字符串,然后再转换为文本,你可以使用to_json或json_build_
insert into t1 (json_data) values (json(l_clob)); insert into t1 (json_data) values (json(l_blob)); commit; end; / 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 虽然某些数据类型可以不用指定 JSON 构造函数,通过隐式类型转换为 JSON 数据,但是推荐显式指定这种类型...
abase=> insert into test_jsonb select replace(uuid_generate_v4()::text,'-',''),('{"a":'||random()*100||', "kxhbsl":"'|| random_string(10) ||'"}')::jsonb from generate_series(1,2000000); INSERT 0 2000000 abase=> insert into test_jsonb select replace(uuid_generate_v4()...
toJson(param.keySet())); double[] targetVector = (double[]) param.get("array"); String sql = "SELECT id, doc_id, embedding, doc_content, " + "cosine_distance(embedding, '" + Arrays.toString(targetVector) + "') AS similarity " + "FROM knowledge_doc_vector " + "ORDER BY ...
SELECT STRING_AGG(tag, ',') FROM product_tags WHERE product_id = 1; 复制代码JSON_AGG/JSONB_AGG:将多行数据聚合成一个JSON对象或JSONB对象。可以用于将满足特定条件的多行数据转换成JSON格式,方便在应用程序中处理。SELECT JSON_AGG(row_to_json(t)) FROM (SELECT * FROM orders WHERE user_id = ...
jsonObject.setType("jsonb"); jsonObject.setValue(JSON.toJSONString(o)); preparedStatement.setObject(i, jsonObject); }@OverridepublicObjectgetNullableResult(ResultSet resultSet, String s)throwsSQLException {returnresultSet.getString(s); }@OverridepublicObjectgetNullableResult(ResultSet resultSet,inti)...
; bad SQL grammar []; nested exception is org.postgresql.util.PSQLException: ERROR: column "destination" is of type json but expression is of type character varying 建议:You will need to rewrite or cast the expression. 解决方法:可以再jdbc连接后面增加stringtype=unspecified来把JSON类型当STRING类型...
json_col = new List<int> { i + 21, i + 22, i + 23 }, byte_col = new byte[] { 100, 200, 3 }, int_col = 1 }); } //string sql1 = db.Insertable(list[0]).ToSqlString(); //string sql = db.Insertable(list).ToSqlString(); //var rst1 = await db.Insertable(list...
Json函数:https://www.donet5.com/Home/Doc?typeId=1232 3、数组类型 3.1 普通数组 [SugarColumn(ColumnDataType ="text []", IsArray =true)] publicstring[] MenuIds {get;set; } //数组函数:SqlSugarCore 5.1.4.158-preview15+ varx=Db.Queryable<UnitArrayLongtest1>() ...
(jsonData,MyData.class);}// Java对象结构publicstaticclassMyData{privateStringname;privateintage;// 省略getter和setter}publicstaticvoidmain(String[]args){Stringjson="{\"name\":\"张三\",\"age\":30}";try{JsonExampleexample=newJsonExample(json);MyDatadata=example.convertJsonToObject();System....