B4J Question can't connect the right database.

Can you post the full error message?

涓夋湀 23, 2016 11:03:14 涓嬪崍 com.mchange.v2.log.MLog <clinit>
淇℃伅: MLog clients using java 1.4+ standard logging.
涓夋湀 23, 2016 11:03:14 涓嬪崍 com.mchange.v2.c3p0.C3P0Registry banner
淇℃伅: Initializing c3p0-0.9.2.1 [built 20-March-2013 11:16:28 +0000; debug? true; trace: 10]
涓夋湀 23, 2016 11:03:14 涓嬪崍 com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getPoolManager
淇℃伅: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 20000, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> 1hge1et9f19i5shhu2o540|1376c05c, debugUnreturnedConnectionStackTraces -> false, description ->...
anywheresoftware.b4j.objects.SQL@64616ca2
2016-03-23 23:03:15.182:INFO::main: Logging initialized @839ms
2016-03-23 23:03:15.246:INFOejs.Server:main: jetty-9.3.z-SNAPSHOT
2016-03-23 23:03:15.295:INFOejsh.ContextHandler:main: Started o.e.j.s.ServletContextHandler@7276c8cd
2016-03-23 23:03:15.297:INFOejs.AbstractNCSARequestLog:main: Opened E:\b4j\study_app\Objects\logs\b4j-2016_03_23.request.log
2016-03-23 23:03:15.352:INFOejs.ServerConnector:main: Started ServerConnector@2df32bf7{HTTP/1.1,[http/1.1]}{0.0.0.0:51041}
2016-03-23 23:03:15.353:INFOejs.Server:main: Started @1009ms
anywheresoftware.b4j.objects.SQL@2683eba3
Connected
(SQLException) java.sql.SQLException: 对象名 'diancai' 无效。

The error is in your SQL Statement or Database Structure.

Error: Object name ' diancai ' is invalid.

diancai is no problem. i test it in visual studio.

Is this related to scheme dbo.? dbo.diancai

or try to change JDBC url database-> databaseName https://sourceforge.net/p/jtds/bugs/707/

I tried dbo.diancai. it shows the same error.
I tried change JDBC url database-->databasename, it shows a new error!

What's the new error (logs)? Which code cause the error ? More information or we will just guess.

Try
Copy the tables into the old database and test
Or use MS JDBC driver instead

edit
Find any differences between the two database, owner,permission...

change JDBC url database-->databasename, it shows a new error!
涓夋湀 24, 2016 9:36:10 涓嬪崍 com.mchange.v2.log.MLog <clinit>
淇℃伅: MLog clients using java 1.4+ standard logging.
涓夋湀 24, 2016 9:36:10 涓嬪崍 com.mchange.v2.c3p0.C3P0Registry banner
淇℃伅: Initializing c3p0-0.9.2.1 [built 20-March-2013 11:16:28 +0000; debug? true; trace: 10]
涓夋湀 24, 2016 9:36:11 涓嬪崍 com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getPoolManager
淇℃伅: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 20000, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> 1hge1et9f1auhoh211xrbxq|1376c05c, debugUnreturnedConnectionStackTraces -> false, description -...
about._buildpage (java line: 68)
java.sql.SQLException: 瀵硅薄鍚?'main' 鏃犳晥銆?
at net.sourceforge.jtds.jdbc.SQLDiagnostic.addDiagnostic(SQLDiagnostic.java:372)
at net.sourceforge.jtds.jdbc.TdsCore.tdsErrorToken(TdsCore.java:2988)
at net.sourceforge.jtds.jdbc.TdsCore.nextToken(TdsCore.java:2421)
at net.sourceforge.jtds.jdbc.TdsCore.getMoreResults(TdsCore.java:671)
at net.sourceforge.jtds.jdbc.JtdsStatement.executeSQLQuery(JtdsStatement.java:505)
at net.sourceforge.jtds.jdbc.JtdsPreparedStatement.executeQuery(JtdsPreparedStatement.java:1029)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:116)
at anywheresoftware.b4j.objects.SQL.ExecQuery2(SQL.java:290)
at anywheresoftware.b4j.objects.SQL.ExecQuery(SQL.java:271)
at b4j.food.about._buildpage(about.java:68)
at b4j.food.about._initialize(about.java:182)
at b4j.food.main._appstart(main.java:76)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:84)
at b4j.food.main.main(main.java:29)

Some parts of log are not readable.

Maybe it's more practical to :
Find any differences between the two databases, owner ,permission...
Or just make a clone of previous(working) database, and copy the tables into it.

No matter what the database name changed, It seems always connected the old database(liusql).

It's finished.