jdbc

问题 I'm new to servers and databases. I've been trying to test out a java application that connects, reads and modifies a Mysql database that is hosted on amazon ec2. System.out.println("-------- MySQL JDBC Connection Testing ------------"); String DNS = "MYDNS"; String myDBname = "DBNAMe" String MYSQLUSER = "USER"; String MYSQLPW = "PW"; try { Class.forName("com.mysql.jdbc.Driver"); } catch (ClassNotFoundException e) { System.out.println("Where is your MySQL JDBC Driver?"); e.printStackTrace();

问题 Could anyone provide some guidance on how to use Table Value Parameters (TVP) with SQL Server JDBC? I am using the 6.0 version of the SQL Server driver provided by Microsoft, and I have reviewed the official documentation as well as the more helpful example How to pass Table-Valued parameters from java to sql server stored procedure? Both of the examples show getting a SQLServerPreparedStatement casted object from a Connection.prepareStatement call in order to call the setStructured method.

问题 Could anyone provide some guidance on how to use Table Value Parameters (TVP) with SQL Server JDBC? I am using the 6.0 version of the SQL Server driver provided by Microsoft, and I have reviewed the official documentation as well as the more helpful example How to pass Table-Valued parameters from java to sql server stored procedure? Both of the examples show getting a SQLServerPreparedStatement casted object from a Connection.prepareStatement call in order to call the setStructured method.

问题 Could anyone provide some guidance on how to use Table Value Parameters (TVP) with SQL Server JDBC? I am using the 6.0 version of the SQL Server driver provided by Microsoft, and I have reviewed the official documentation as well as the more helpful example How to pass Table-Valued parameters from java to sql server stored procedure? Both of the examples show getting a SQLServerPreparedStatement casted object from a Connection.prepareStatement call in order to call the setStructured method.

问题 I read about it in the internet but I am not able to get answer for some queries. Q1. It is said that when the PreparedStatement is executed, the DBMS can just run the PreparedStatement SQL statement without having to compile it first. My question is when preparedStetement.execute() is called what happens? (My understanding: The sql without any parameter is sent to DBMS which is compiled & cached by the DBMS for future use. Then the parameters are sent & DBMS replace them with the place

问题 Considering the following example select * from foo where time +'10 day' >current_timestamp I would like to make this query parametrized for Java, and I don't know how to set the 10 day ?! (String doesn't work) 回答1: select * from foo where time +'10 day'::interval >current_timestamp; 回答2: You may either pass a String parameter and cast it, e.g. select * from foo where (time + CAST(? AS interval)) > current_timestamp or pass an int parameter multiplied by a fixed interval, which is better if

问题 I am using JDBC.My test application inserts some data into MySQL,then query it via the same connection.I have four computers,one is MySQL server,three are UBuntu Desktops.In one UBuntu Desktop,my test application run into this problem,but I don't find this problem in other UBuntu Desktops. Also,If I create a new connection to query data after inserting,I can find the data.The version of mysql-connector-java library is 5.1.17.I tried 5.1.18,but the problem still exists. 回答1: The default

问题 I am using JDBC.My test application inserts some data into MySQL,then query it via the same connection.I have four computers,one is MySQL server,three are UBuntu Desktops.In one UBuntu Desktop,my test application run into this problem,but I don't find this problem in other UBuntu Desktops. Also,If I create a new connection to query data after inserting,I can find the data.The version of mysql-connector-java library is 5.1.17.I tried 5.1.18,but the problem still exists. 回答1: The default

问题 This question already has answers here : How to get a value from the last inserted row? [duplicate] (14 answers) Closed 7 years ago . I am using the following code to insert a new row to database, I need to get the id of the last inserted row but when I run the code it shows the following message: SEVERE: java.sql.SQLException: Generated keys not requested. You need to specify Statement.RETURN_GENERATED_KEYS to Statement.executeUpdate() or Connection.prepareStatement(). When I use the

问题 I'm trying to have a simple Jersey based jaxrs listener, running on my existing tomcat 7.0.57. Tomcat has a global config in its context.xml for a jdbc datasource, which I want to use. My problem is that I can't get the resource to resolve via the @Resource annotation. Heres a simple test example @Path("/") public class TestJersey { @Resource(name = "jdbc/default") private DataSource dsA; @Resource(name = "java:comp/env/jdbc/default") private DataSource dsB; @Resource(lookup = "java:comp/env