ojdbc

问题 I'm trying to instrument my jdbc connections. I know there are several similar questions about this topic. I tried everything but couldn't find the propper way to solve my issue so far. Also tried the answers to this question, with no result: Apache Commons DBCP connection object problem, Thread: ClassCastException in org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrapper I'm working with Tomcat 7 and Java 7. Here's where I define the oracle connection pool in my context.xml

问题 I am receiving an error when running my spring-boot application with embedded-tomcat (haven't tried with server tomcat yet). java.lang.IllegalStateException: Tomcat 7 reflection failed at org.springframework.boot.context.embedded.tomcat.SkipPatternJarScanner.scan(SkipPatternJarScanner.java:77) at org.apache.catalina.startup.TldConfig.execute(TldConfig.java:271) at org.apache.catalina.startup.TldConfig.lifecycleEvent(TldConfig.java:590) at org.apache.catalina.util.LifecycleSupport

问题 For school project I had to make program in Java that uses data base and to do so I had to import to that project file ojdbc6.jar. I know that without it I couldn't use data bases but I don't really know what is this file. Could someone explain? How such file is called and what exactly is its purpose? 回答1: Simply stated, a JDBC driver is a suite of classes that map the functionality required by the JDBC API onto the functionality provided by a specific kind of database. Each database uses a

问题 For school project I had to make program in Java that uses data base and to do so I had to import to that project file ojdbc6.jar. I know that without it I couldn't use data bases but I don't really know what is this file. Could someone explain? How such file is called and what exactly is its purpose? 回答1: Simply stated, a JDBC driver is a suite of classes that map the functionality required by the JDBC API onto the functionality provided by a specific kind of database. Each database uses a

问题 One of the jobs of OJDBC is to map Oracle data types to Java types. However, we noticed that if we give a CHAR data type, it is not mapped to java.lang.String . The versions showing this behavior are: OJDBC7 v12.1.0.2 and OJDBC6 v12.1.0.1 . The older versions did indeed map the CHAR data type to: java.lang.String . On digging deeper, we discovered that there is a class: StructMetaData within the oracle.jdbc.driver package of OJDBC that implements the Oracle data type to Java Type mapping.

问题 We are trying to store an UTF-16 encoded String into an AL32UTF8 Oracle database. Our program works perfectly on a database that uses WE8MSWIN1252 as charset. When we try to run it on a database that uses AL32UTF8 it gets to a java.sql.SQLException: ORA-01461: can bind a LONG value only for insert into a LONG column . In the testcase below everything works fine as long as our input data doesn't get too long. The input String can exceed 4000 chars. We wish to retain as much information as

问题 Will ojdbc6.jar work for JDK 1.7 and Oracle 12c? Should I use ojdbc7.jar? Thank you in advance. 回答1: The included ojdbc6.jar is the latest 12c driver. The only difference between ojdbc6.jar and ojdbc7.jar is that the latter one is compiled with Java 7. Since DB Solo is at least for now using Java 6, it can only include ojdbc6.jar. In terms of functionality the versions are identical. Link 回答2: Note that another difference between ojdbc6 and ojdbc7 is the supported Oracle version. Specifically

问题 I am currently working on cloud migration activities. We have installed a new “Apache Tomcat/8.0.43” in cloud server and transferred the war files from local to cloud. while starting the tomcat server I’m getting below error : WARNING [localhost-startStop-1] org.apache.tomcat.util.scan.StandardJarScanner.scan Failed to scan [file:/usr/share/java/tomcat8/gdk_custom.jar] from classloader hierarchy java.io.FileNotFoundException: /usr/share/java/tomcat8/gdk_custom.jar (No such file or directory)

问题 I'm following the JDBC Developer's Guide and trying to test the JDBC thin driver connection using a short java program. import java.sql.*; import oracle.jdbc.*; import oracle.jdbc.pool.OracleDataSource; class JDBCVersion { public static void main (String args[]) throws SQLException { OracleDataSource ods = new OracleDataSource(); ods.setURL("jdbc:oracle:thin:hr/hr@localhost:1522:orcl"); Connection conn = ods.getConnection(); // Create Oracle DatabaseMetaData object DatabaseMetaData meta =

问题 For inexplicable reasons however, this morning the performance increased for two of my Queries that used to be slow. I have no idea why. I have no authority over the server, maybe someone changed something. The problem is no more . In a nutshell: s.executeQuery(sql) runs extremely slowly within a tomcat servlet on server Same query runs fine without servlet (simple java program) on the same machine Not all queries are slow within the servlet. Only a few bigger ones do Same servlet runs fast