How to pass session variables in JDBC url properly?
I found on mysql docs that there is an option to pass session variables in url. But there is no example, I tried to do it like that: sessionVariables A comma-separated list of name/value pairs to be sent as SET SESSION to the server when the driver connects.
How to execute JDBC query with variables in Java?
String poster = “user”; Statement stmt = con.createStatement (); ResultSet rs = stmt.executeQuery (“SELECT * FROM `prices` WHERE `poster`=”+poster); This does not work.Any tips or tricks would be appreciated.
When to use prepared statement in JDBC query?
It’s recommended using PreparedStatement since the way you are currently building the query (by concatenating strings) makes it easy for an attacker to inject arbitrary SQL code in a query, a security threat known as a SQL injection. 1) In general, to “parameterize” your query (or update), you’d use JDBC “prepared statements”:
Can a system variable be set at session level?
This will only work for system variables that have a SESSION scope (you can find out which ones can be set at SESSION -level by looking at the list of Server System Variables ). The connection will fail if the variable doesn’t exist, if it is not a server system variable or if its scope is GLOBAL -only.
How to set the JDBC connection pool size?
Set JDBC Connection Pool attributes with the Admin Console under Resources > JDBC > Connection Pools > PoolName. The following attributes affect performance: Pool Size Settings
Can a JDBC resource refer to more than one JDBC pool?
More than one JDBC Resource is allowed to refer to the same JDBC Connection Pool. In such a case, the physical connection pool is shared by all the resources. Monitoring JDBC Connection Pools
How does pooled connection reuse work in Java?
In some cases users execute stored procedures that might affect the database session context/variables before executing another query to retrieve some data. After a thread is finished, connection is closed but the way the pooled connections work, the connection is not actually closed but rather returned to the connection pool for reuse.