derby

问题 I am new to apache derby and I cant seem to make work CREATE TABLE IF NOT EXISTS table1 ... as can be achieved in MySql etc. I am getting a \'Syntax error: Encountered \"NOT\" at line 1, column 17.\' , when I try to run this SQL statement in my Java program. I checked in the documentation page for Derby Db Create Statements, but couldn\'t find such an alternative. 回答1: Create the table, catch the SQLException and check SQL status code. The full list of error codes can be found here but I

问题 I see this question was raised several times already and I went through all of them. But I am still unable to fix my problem. Could anyone help me pinpoint what I am doing wrong? I get the following error message when I try to access database.jsp: HTTP Status 500 - An exception occurred processing JSP page /database.jsp at line 24 type Exception report message An exception occurred processing JSP page /database.jsp at line 24 description The server encountered an internal error that prevented

问题 Why does it say null URL and gives a empty \' \' class in the exception when I have provided the database URL? I am trying to connect to a derby database via a servlet while using Tomcat. When the servlet gets run, I get the following exceptions: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class \'\' for connect URL \'null\' at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1452) at org.apache.tomcat.dbcp.dbcp

问题 I get this error in Netbeans: java.sql.SQLException: No suitable driver found for jdbc:derby://localhost:1527/ How is this caused and how can I solve it? 回答1: java.sql.SQLException: No suitable driver found for jdbc:derby://localhost:1527/ This exception has two causes: The driver is not loaded. The JDBC URL is malformed. In your case, I'd expect to see a database name at the end of the connection string. For example (use create=true if you want the database to be created if it doesn't exist)