JPA + SQLite问题

我正在配置JPA以使用SQLite数据库，以hibernate作为提供程序。 我将一个pojo映射到一个表，没有fk，现在只是简单的。 我正在使用我在互联网上找到的SQLDialect。当我尝试初始化我的应用程序时，我得到了这个堆栈跟踪：

java.sql.SQLException: SQLite supports only TRANSACTION_SERIALIZABLE at org.sqlite.Conn.setTransactionIsolation(Conn.java:131) at com.mchange.v2.c3p0.impl.NewProxyConnection.setTransactionIsolation(NewProxyConnection.java:701) at org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:58) at org.hibernate.tool.hbm2ddl.SuppliedConnectionProviderConnectionHelper.prepare(SuppliedConnectionProviderConnectionHelper.java:27) at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:127) at org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:314) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1300) at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:915) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:730) at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:121) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:33) at hr.loggingserver.listeners.ApplicationListener.contextInitialized(ApplicationListener.java:27) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3843) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4342) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardHost.start(StandardHost.java:719) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at org.apache.catalina.core.StandardService.start(StandardService.java:516) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:578) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413) 

这是我的persistence.xml：

   org.hibernate.ejb.HibernatePersistence hr.loggingserver.model.Type hr.loggingserver.model.LogSpec     <!--  -->            <!-- -->         

这是我正在使用的SQLDialect类：

 package hr.loggingserver.model.dao.dialect; /* * The author disclaims copyright to this source code. In place of * a legal notice, here is a blessing: * * May you do good and not evil. * May you find forgiveness for yourself and forgive others. * May you share freely, never taking more than you give. * */ import java.sql.Types; import org.hibernate.dialect.Dialect; import org.hibernate.dialect.function.StandardSQLFunction; import org.hibernate.dialect.function.SQLFunctionTemplate; import org.hibernate.dialect.function.VarArgsSQLFunction; import org.hibernate.Hibernate; public class SQLiteDialect extends Dialect { public SQLiteDialect() { super(); registerColumnType(Types.BIT, "integer"); registerColumnType(Types.TINYINT, "tinyint"); registerColumnType(Types.SMALLINT, "smallint"); registerColumnType(Types.INTEGER, "integer"); registerColumnType(Types.BIGINT, "bigint"); registerColumnType(Types.FLOAT, "float"); registerColumnType(Types.REAL, "real"); registerColumnType(Types.DOUBLE, "double"); registerColumnType(Types.NUMERIC, "numeric"); registerColumnType(Types.DECIMAL, "decimal"); registerColumnType(Types.CHAR, "char"); registerColumnType(Types.VARCHAR, "varchar"); registerColumnType(Types.LONGVARCHAR, "longvarchar"); registerColumnType(Types.DATE, "date"); registerColumnType(Types.TIME, "time"); registerColumnType(Types.TIMESTAMP, "timestamp"); registerColumnType(Types.BINARY, "blob"); registerColumnType(Types.VARBINARY, "blob"); registerColumnType(Types.LONGVARBINARY, "blob"); // registerColumnType(Types.NULL, "null"); registerColumnType(Types.BLOB, "blob"); registerColumnType(Types.CLOB, "clob"); registerColumnType(Types.BOOLEAN, "integer"); registerFunction("concat", new VarArgsSQLFunction(Hibernate.STRING, "", "||", "")); registerFunction("mod", new SQLFunctionTemplate(Hibernate.INTEGER, "?1 % ?2")); registerFunction("substr", new StandardSQLFunction("substr", Hibernate.STRING)); registerFunction("substring", new StandardSQLFunction("substr", Hibernate.STRING)); } public boolean supportsIdentityColumns() { return true; } /* public boolean supportsInsertSelectIdentity() { return true; // As specify in NHibernate dialect } */ public boolean hasDataTypeInIdentityColumn() { return false; // As specify in NHibernate dialect } /* public String appendIdentitySelectToInsert(String insertString) { return new StringBuffer(insertString.length()+30). // As specify in NHibernate dialect append(insertString). append("; ").append(getIdentitySelectString()). toString(); } */ public String getIdentityColumnString() { // return "integer primary key autoincrement"; return "integer"; } public String getIdentitySelectString() { return "select last_insert_rowid()"; } public boolean supportsLimit() { return true; } public String getLimitString(String query, boolean hasOffset) { return new StringBuffer(query.length() + 20).append(query).append( hasOffset ? " limit ? offset ?" : " limit ?").toString(); } public boolean supportsTemporaryTables() { return true; } public String getCreateTemporaryTableString() { return "create temporary table if not exists"; } public boolean dropTemporaryTableAfterUse() { return false; } public boolean supportsCurrentTimestampSelection() { return true; } public boolean isCurrentTimestampSelectStringCallable() { return false; } public String getCurrentTimestampSelectString() { return "select current_timestamp"; } public boolean supportsUnionAll() { return true; } public boolean hasAlterTable() { return false; // As specify in NHibernate dialect } public boolean dropConstraints() { return false; } public String getAddColumnString() { return "add column"; } public String getForUpdateString() { return ""; } public boolean supportsOuterJoinForUpdate() { return false; } public String getDropForeignKeyString() { throw new UnsupportedOperationException( "No drop foreign key syntax supported by SQLiteDialect"); } public String getAddForeignKeyConstraintString(String constraintName, String[] foreignKey, String referencedTable, String[] primaryKey, boolean referencesPrimaryKey) { throw new UnsupportedOperationException( "No add foreign key syntax supported by SQLiteDialect"); } public String getAddPrimaryKeyConstraintString(String constraintName) { throw new UnsupportedOperationException( "No add primary key syntax supported by SQLiteDialect"); } public boolean supportsIfExistsBeforeTableName() { return true; } public boolean supportsCascadeDelete() { return false; } } 

有谁知道我做错了什么？ 谢谢。

Answer 1

SQLException的原因是您使用的SQLite JDBC驱动程序不支持您指定的事务隔离级别。

在persistance.xml中，hibernate.connection.isolation设置为4（TRANSACTION_REPEATABLE_READ）。 SQLException表示驱动程序仅支持TRANSACTION_SERIALIZABLE。 这相当于将hibernate.connection.isolation设置为8.您需要更改此值以使用驱动程序。