upsert

来源： https://stackoverflow.com/questions/60439687/upsert-in-rdbmsmysql-table-using-pyspark-dataframes-and-jdbc

来源： https://stackoverflow.com/questions/60439687/upsert-in-rdbmsmysql-table-using-pyspark-dataframes-and-jdbc

问题 So I'm trying to use the model.upsert() of sequelize and all i receive is inserts , no matter what i change in the query. I have a Transaction model that has some fields, with the default generated id. reading the sequelize's upsert documentation i noticed this: An update will be executed if a row which matches the supplied values on either the primary key or a unique key is found. Note that the unique index must be defined in your sequelize model and not just in the table. So i was guessing

问题 So I'm trying to use the model.upsert() of sequelize and all i receive is inserts , no matter what i change in the query. I have a Transaction model that has some fields, with the default generated id. reading the sequelize's upsert documentation i noticed this: An update will be executed if a row which matches the supplied values on either the primary key or a unique key is found. Note that the unique index must be defined in your sequelize model and not just in the table. So i was guessing

问题 I've scraped some data from web sources and stored it all in a pandas DataFrame. Now, in order harness the powerful db tools afforded by SQLAlchemy, I want to convert said DataFrame into a Table() object and eventually upsert all data into a PostgreSQL table. If this is practical, what is a workable method of going about accomplishing this task? 回答1: If you are using PostgreSQL 9.5 or later you can perform the UPSERT using a temporary table and an INSERT ... ON CONFLICT statement: with engine

问题 I am using mongoose. I want to create a document chat with an array users (including userId1 , userId2 ), if I do not find it: This is how I do: ChatModel.findOneAndUpdate( { users: { $all: [userId1, userId2] }}, { $setOnInsert: { users: [userId1, userId2] }}, { upsert: true }) .exec() .catch(err => console.log(err)); But I got the error: MongoError: cannot infer query fields to set, path 'users' is matched twice This is Chat Schema: { users: [{ type: Schema.Types.ObjectId, ref: 'User' }],

问题 I am using mongoose. I want to create a document chat with an array users (including userId1 , userId2 ), if I do not find it: This is how I do: ChatModel.findOneAndUpdate( { users: { $all: [userId1, userId2] }}, { $setOnInsert: { users: [userId1, userId2] }}, { upsert: true }) .exec() .catch(err => console.log(err)); But I got the error: MongoError: cannot infer query fields to set, path 'users' is matched twice This is Chat Schema: { users: [{ type: Schema.Types.ObjectId, ref: 'User' }],

问题 I have a table where a user answers to a question. The rules are that the user can answer to many questions or many users can answer one question BUT a user can answer to a particular question only once. If the user answers to the question again, it should simply replace the old one. Generally the on conflict do update works when we are dealing with unique columns. In this scenario the columns person_id and question_id cannot be unique. However the combination of the two is always unique. How

问题 Given this table: create table test ( name text primary key ); I need to write a plpgsql function with a variable name that collides with the primary key name, which I must use in a on conflict clause: create or replace function func( name text -- this variable name... ) returns void language plpgsql as $$ begin insert into test (name) values (name) on conflict (name) do update -- ...conflicts with this line set name = func.name; end; $$; This compiles, but then throws an ambiguous column

问题 I'm trying to convert the following Oracle query to PostgreSQL: MERGE into feepay.TRPT_W2_REPORTS TRPT1 USING( WITH RWS AS (SELECT PROG.BINCLIENT, TRPT.PUT_DIRECTORY FROM feepay.program2 PROG INNER JOIN feepay.TRPT_W2_PROGRAMS TRPT ON (PROG.BINCLIENT = TRPT.BINCLIENT OR PROG.ISSUER_ID = TRPT.ISSUER_ID)) SELECT TCI.CUSTOMERNAME AS ACCOUNT, TC.CUSTOMER_ID AS urn, TC.LAST_NAME, TC.FIRST_NAME, TC.DOB, TCA.ADDRESS FROM feepay.TAU_CARDNUMBERS TCN INNER JOIN feepay.TAU_CUSTOMER_CARDNUMBER TCCN ON