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jdbc cannot connect to postgresql database - Stack Overflow

When using jdbc to connect to the postgresql database, the error is as follows: {code...} The key error message: Cannot create PoolableConnectionFactory (????????: ?????? "uav_test " ??????) Connection The parameters are as follows: {code...} When I change the postgresql database...

給我你的懷抱 2017-05-17 10:02:08 0  2  1077

When calling Spring Boot REST API multiple times using the same JDBC connection

I have a REST web service written in Java/SpringBoot, running on Tomcat9. I need to create a MySQL temporary table in one web service call and access it in another service call. Since the temporary table is connection scoped, I need to use the same connection I used when creating the table in the fi...

P粉769045426 2023-08-27 09:40:00 0  1  724

How to use JDBC in Java to implement continuous updates of the database server without increasing RAM consumption

I'm writing a fighting game in JavaFX, using JDBC to update information into a MySQL database. Most tasks that get basic information from the database server work fine if they are not repeated continuously. The problem arises when I need the program to constantly update the opponent's information, s...

P粉323224129 2023-09-07 20:10:29 0  1  987

java - How does Shiro's Subject.login() know which table my user information is in?

shiro-jdbc-realm.ini

為情所困 2017-05-27 17:40:56 0  2  801

JDBC datetime type

I have a DATETIME column in a MySQL database. I use ResultSet metadata to retrieve the column type and it returns TIMESTAMP which is incorrect. How can I get the correct java.sql.SQLType value for this column? I'll try to be more specific. I define the structure of the database in Java code. For exa...

P粉486138196 2023-12-27 20:52:41 0  1  665

mysql - Jdbc linked database

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巴扎黑 2017-06-06 09:52:22 0  1  951

How does jdbc return automatically defined beans

{code...}

某草草 2017-05-27 17:38:59 0  1  640

jdbc - About the error: java.sql.SQLException: ResultSet.next not called

1.` public Res evaluateCourse(@FormParam("stuId") int stuId, @FormParam("score") String score) { {code...} 2. Test code: {code...} 3. Error message: {Code...} After calling ResultSet.next(), the cursor moves to the next line, then...

黃舟 2017-06-28 09:24:44 0  1  948

Resolving "communication link failure" with JDBC and MySQL

I'm trying to connect to my local MySQL server but I keep getting an error message. Here is the code. publicclassConnect{publicstaticvoidmain(String[]args){Connectionconn=null;try{StringuserName="myUsername";Stringpassword="myPassword";Stringurl=&q

P粉038161873 2023-08-24 15:46:59 0  1  623

Solving "communication link failure" issues using JDBC and MySQL

I'm trying to connect to my local MySQL server but I keep getting an error message. Here is the code. publicclassConnect{publicstaticvoidmain(String[]args){Connectionconn=null;try{StringuserName="myUsername";Stringpassword="myPassword";Stringurl=&q

P粉633309801 2023-08-28 10:53:42 0  1  622

Can mySQL in wamp be used alone?

I used to install the integrated environment wamp when I was developing with php. Now I am developing with jsp and I don’t want to install mysql separately. Is it okay? After opening wamp, how to connect directly using jdbc?

阿神 2017-06-06 09:52:15 0  3  983

Unable to create/set up connection: Unknown system variable 'query_cache_size'

I'm running an application using JDBC and MySQL, using hikari pool, but it cannot build due to the following error: ","message":"HikariPool-1-Starting..."}{"timestamp":"16Jun202313:42:04,078" ,"thread":"Timer-0&q

P粉864872812 2023-09-03 23:32:54 0  1  1135

How to dynamically load jdbc.properties

Because I want to distinguish the username and password of the database in the development, test, and production environments, is there a way to dynamically read the specified jdbc configuration file, such as jdbc_dev.properties, jdbc_test.properties, etc. {Code...} I don’t know if this idea is corr...

PHPz 2017-05-17 10:07:55 0  2  847

Understand the functionality of the Statement.setFetchSize(nSize) method in the SQL Server JDBC driver

I have a very large table with millions of records every day, and at the end of each day I pull all the records from the previous day. I do it like this: StringSQL="selectcol1,col2,colnfrommytablewheretimecol=yesterday";Statement.executeQuery(SQL);The problem is that this program requires ...

P粉463811100 2023-08-27 17:05:57 0  1  669

java.sql.SQLNonTransientConnectionException: Unable to create a connection to the database server

I have an issue with error code "java.sql.SQLNonTransientConnectionException: Unable to create a connection to the database server". I'm trying to establish a connection to a database using JDBC, the credentials are spelled correctly. Can you help me check possible problems in this project...

P粉086993788 2024-01-10 16:45:25 0  1  571

Error while connecting to MySQL database on Hasura Cloud

I'm using Hasura cloud environment. For the MySQL database, I am using MySQLWorkbench and created a database. I want to use this database in Hasura environment. MySQL server runs on port 3306. My JDBC connection string is: jdbc:mysql://localhost:3306/employees?user=admin&password=password@123 Af...

P粉296080076 2023-08-15 10:54:43 0  1  579

MariaDB stored procedure exception information: Unexpected end of stream, error reading 0 bytes

We have a stored procedure in MariaDB that runs fine on the server, but when we run it from the client using JDBC, we can get the first few rows, but then always get the following error: unexpectedendofstream,read0bytesfrom4(socketwasclosedbyserver) table loan_balances2 Not too big, about 600K rows....

P粉004287665 2023-08-26 22:16:32 0  1  623

Confluence MySQL connector connection not established

I'm trying to connect MySQLDB (installed in my laptop) from ConfluenceCloudRemote access using the MySQLSource connector. I can't establish a connection with MySQLConnector. Error: Unable to verify configuration. If configured, this means that the configuration is invalid and the connector continues...

P粉057869348 2023-09-09 13:22:30 0  1  887

Laravel Modal does not return data

I don't know why I'm not getting the value from the modal in my Laravel controller. Please check it for me. However, I use the same code for other modes and controllers. It's working and returning the value from the property without any issues. I'm using Laravel8 and php8.1; below is my code. app\Ht...

P粉174151913 2024-03-29 10:31:31 0  1  591

Can I use the automatic generation module of thinkphp5 in Windows 7 system? How to configure and use

明民 2017-10-10 17:04:14 0  2  1388