jdbc

问题 I just pulled and run the official Docker MySQL image and have it running locally on my machine: docker run --name mydb -e MYSQL_ROOT_PASSWORD=12345 -d mysql:5.7.11 The instructions on that screen tell you how to connect to the MySQL server (container) from inside yet another container (which is configured as a command-line client). But I have a generic JDBC fat client (SQuirreL) and am wondering how to connect to my docker container. For the JDBC connection string, I need to provide both a

问题 I have a web-app in Django and backend in Hbase. To access hbase I'm using Apache Phoenix to query hbase. Phoenix has jdbc drivers exposed. How can I integrate Phoenix with Django ORM using these jdbc drivers? Can I write customer db adapter or is there any other way? Thanks in advance. 回答1: I have also been trying to see if it is possible to extend the ORM of django to use apache phoenix. but for a start, you can checkout JayDeBeAPI or phoenixdb As an example, I was able to connect and

问题 I have a web-app in Django and backend in Hbase. To access hbase I'm using Apache Phoenix to query hbase. Phoenix has jdbc drivers exposed. How can I integrate Phoenix with Django ORM using these jdbc drivers? Can I write customer db adapter or is there any other way? Thanks in advance. 回答1: I have also been trying to see if it is possible to extend the ORM of django to use apache phoenix. but for a start, you can checkout JayDeBeAPI or phoenixdb As an example, I was able to connect and

问题 This question already has an answer here : Invalid state, the ResultSet object is closed (1 answer) Closed 5 years ago . Given the code below: //connection stuff ResultSet rs = statement.executeQuery(query1); statement.executeQuery(query2); while(rs.next){ //code } Is the result set rs still valid even though a second statement has been executed? I know that when you close a statement the result set isn't valid any longer, but here the code is simply executing another query and not storing it

问题 How to use optimistic locking with batch updates? I am using SimpleJdbcTemplate and for a single row I can build update sql that increments version column value and includes version in WHERE clause. Unfortunately the result int[] updated = simpleJdbcTemplate.batchUpdate does not contain rowcounts when using oracle driver. All elements are -2 indicating unknown rowcount. Is there some other, more performant way of doing this than executing all updates individually? These batches contain an

问题 i'm running mysql 5.5 with mysql 5.1.18 connector. a simple query of style select * from my_table where column_a in ('aaa','bbb',...) and column b=1; is executed from within java application. the query returns a resultset of 25k rows, 8 columns in each. while reading the results in while loop while(rs.next()) { MyObject c= new MyObject(); c.setA(rs.getString("A")); c.setB(rs.getString("B")); c.setC(rs.getString("C")); ... } a following exception is thrown, usually during the first loops, but

问题 I have two tables that I join on the id-column, they look like: +-------+ | users | +----+--+---+ | id | name | +----+------+ +-------+ | posts | +-------+------+---------+ | id | user_id | message | +----+---------+---------+ And now I want to select all posts and include the username, with: SELECT * FROM posts, users WHERE user_id = users.id And then I try to get the values with: ResultSet rs = // SQL if(rs.next()) { rs.getInt("posts.id"); ... } But I get SQLException when executing rs

问题 I have two tables that I join on the id-column, they look like: +-------+ | users | +----+--+---+ | id | name | +----+------+ +-------+ | posts | +-------+------+---------+ | id | user_id | message | +----+---------+---------+ And now I want to select all posts and include the username, with: SELECT * FROM posts, users WHERE user_id = users.id And then I try to get the values with: ResultSet rs = // SQL if(rs.next()) { rs.getInt("posts.id"); ... } But I get SQLException when executing rs

问题 I have a table which has a data column with an structure similar to following: {"title": "some title", "objects": [{"id": "id1"}, {"id": "id2"}]} now I want to find all rows that have an object with specific id in their objects array inside data. Following query works perfectly from PSQL console: SELECT id, data FROM table_name WHERE data->'objects' @> '[{"id": "id1"}]' however I can not get this to work as a prepared statement over JDBC driver. the value for id should be a parameter, so I

问题 I am trying to read a MySQL db record using this simple code in Google Apps Script: function testConn(){ // make the connection var connection = Jdbc.getConnection("jdbc:mysql://" + DB.URL + ":" + DB.PORT + "/" + DB.DATABASE, DB.USERNAME, DB.PASSWORD); // perform the query var SQLstatement = connection.createStatement(); var result = SQLstatement.executeQuery("SELECT date_available FROM oc_product where model = 'B23-U57-U57'"); var colNum = result.getMetaData().getColumnCount(); while(result