我目前正在为我的实习构建一个项目，我被困了两天，试图在java中使用Liquibase。一切似乎都很正常：找到了更改日志文件，正确的URI，用户名和密码;但是当我运行它时，我的更改集没有被处理。
我使用这个类来管理我的程序中的liquibase操作，例如 rollback、update、updateSQL 和 futureRollbackSQL，给定一个更新日志和最终的目标文件。如果源或目标来自远程服务器，我使用一些SSH交互（scp to，scp from）与JSch和临时文件（但这不是主题）。
这是我现在的java代码，给定db，user，passwd，realAction是之前设置的，changelogpath和dest是一些数据存储类。

Connection c = null;
Database database = null;
PrintWriter pw = null;
File file = null;
liquibase.Liquibase liquibase = null;
contexts = db+"."+user;
try {
    pw = new PrintWriter(new FileWriter(file));
    // Get connection
    c = SQLManager.getInstance().getConnection(db, user, passwd);
    // Get liquibase connection
    database = DatabaseFactory.getInstance().findCorrectDatabaseImplementation(new JdbcConnection(c));
    liquibase = new liquibase.Liquibase(new DatabaseChangeLog(fsource), new FileSystemResourceAccessor(),
            database);
    // Run liquibase action
    switch (realAction) {
        case Constants.LIQUIBASE_ACTION_FUTUREROLLBACKSQL:
            liquibase.futureRollbackSQL(pw);
            break;
        case Constants.LIQUIBASE_ACTION_UPDATESQL:
            liquibase.update(contexts, pw);
            break;
        case Constants.LIQUIBASE_ACTION_UPDATE:
            liquibase.update(contexts);
            if (!c.getAutoCommit())
                c.commit();
            break;
        default:
            throw new OdewipElementRuntimeException(this, "Action not implemented");
    }
    pw.close();
    database.close();
    c.close();
} catch (IOException | SQLException | LiquibaseException e) {
    throw new Exception(e.getMessage());
} finally {
    if (c != null) {
        try {
            c.close();
        } catch (SQLException e) {
            // nothing to do
            throw new RuntimeException(e.getClass() + ": " + e.getMessage());
        }
    }
}

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以下是我的changelog：

<?xml version="1.0" encoding="UTF-8"?>

<databaseChangeLog
  xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:ora="http://www.liquibase.org/xml/ns/dbchangelog-ext"
  xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-2.0.xsd    http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd">    

    <changeSet id="mychangeset" author="testy">
        <preConditions onSqlOutput="TEST" onFail="MARK_RAN">
            <not>
                <tableExists tableName="abcd"/>
            </not>
        </preConditions>
        <createTable tableName="abcd">
            <column name="id" type="number">
                <constraints primaryKey="true"/>
            </column>
        </createTable>
    </changeSet>

</databaseChangeLog>

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Liquibase似乎做了一些 * 事情 *，除了解析我的修改。当我启动我的操作时，sql生成的文件只包含创建liquibase的两个表（databasechangelog和databasechangeloglock）就这样。update操作根本不会修改任何内容（甚至没有创建前面提到的两个表）。我（100%）确定表 abcd 在执行之前不存在于数据库中。
所以我想我需要一些帮助，在这一点上，找出什么是不工作的。我试图看看一些例子从liquibase论坛，但没有帮助。我目前使用的Maven的liquibase 3.4.0：

<dependency>
    <groupId>org.liquibase</groupId>
    <artifactId>liquibase-core</artifactId>
    <version>3.4.0</version>
</dependency>

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还有一个小问题是我如何包含一个特殊的oracle数据库驱动程序（ojdbc6.jar）？
谢谢你的回答。

**EDIT 06/08/2015：**我在调试模式下获得了日志（故意更改了架构名称）：

DEBUG 06/08/15 09:28: liquibase: Executing QUERY database command: select count(*) from MYSCHEMA.DATABASECHANGELOGLOCK
DEBUG 06/08/15 09:28: liquibase: Create Database Lock Table
DEBUG 06/08/15 09:28: liquibase: Executing EXECUTE database command: CREATE TABLE MYSCHEMA.DATABASECHANGELOGLOCK (ID NUMBER(10) NOT NULL, LOCKED NUMBER(1) NOT NULL, LOCKGRANTED TIMESTAMP, LOCKEDBY VARCHAR2(255), CONSTRAINT PK_DATABASECHANGELOGLOCK PRIMARY KEY (ID))
DEBUG 06/08/15 09:28: liquibase: Created database lock table with name: MYSCHEMA.DATABASECHANGELOGLOCK
DEBUG 06/08/15 09:28: liquibase: Executing QUERY database command: select count(*) from MYSCHEMA.DATABASECHANGELOGLOCK
DEBUG 06/08/15 09:28: liquibase: Initialize Database Lock Table
DEBUG 06/08/15 09:28: liquibase: Executing EXECUTE database command: DELETE FROM MYSCHEMA.DATABASECHANGELOGLOCK
DEBUG 06/08/15 09:28: liquibase: Executing EXECUTE database command: INSERT INTO MYSCHEMA.DATABASECHANGELOGLOCK (ID, LOCKED) VALUES (1, 0)
DEBUG 06/08/15 09:28: liquibase: Executing QUERY database command: SELECT LOCKED FROM MYSCHEMA.DATABASECHANGELOGLOCK WHERE ID=1 FOR UPDATE
DEBUG 06/08/15 09:28: liquibase: Lock Database
DEBUG 06/08/15 09:28: liquibase: Executing UPDATE database command: UPDATE MYSCHEMA.DATABASECHANGELOGLOCK SET LOCKED = 1, LOCKEDBY = 'CRO09177 (xx.xx.xx.xxx)', LOCKGRANTED = to_date('2015-08-06 09:28:28', 'YYYY-MM-DD HH24:MI:SS') WHERE ID = 1 AND LOCKED = 0
INFO 06/08/15 09:28: liquibase: Successfully acquired change log lock
DEBUG 06/08/15 09:28: liquibase: Create Database Change Log Table
INFO 06/08/15 09:28: liquibase: Creating database history table with name: MYSCHEMA.DATABASECHANGELOG
DEBUG 06/08/15 09:28: liquibase: Executing EXECUTE database command: CREATE TABLE MYSCHEMA.DATABASECHANGELOG (ID VARCHAR2(255) NOT NULL, AUTHOR VARCHAR2(255) NOT NULL, FILENAME VARCHAR2(255) NOT NULL, DATEEXECUTED TIMESTAMP NOT NULL, ORDEREXECUTED NUMBER(10) NOT NULL, EXECTYPE VARCHAR2(10) NOT NULL, MD5SUM VARCHAR2(35), DESCRIPTION VARCHAR2(255), COMMENTS VARCHAR2(255), TAG VARCHAR2(255), LIQUIBASE VARCHAR2(20), CONTEXTS VARCHAR2(255), LABELS VARCHAR2(255))
DEBUG 06/08/15 09:28: liquibase: Executing QUERY database command: select count(*) from MYSCHEMA.DATABASECHANGELOG
INFO 06/08/15 09:28: liquibase: Reading from MYSCHEMA.DATABASECHANGELOG
DEBUG 06/08/15 09:28: liquibase: Executing QUERY database command: SELECT FILENAME,AUTHOR,ID,MD5SUM,DATEEXECUTED,ORDEREXECUTED,EXECTYPE,DESCRIPTION,COMMENTS,TAG,LIQUIBASE,LABELS,CONTEXTS FROM MYSCHEMA.DATABASECHANGELOG ORDER BY DATEEXECUTED ASC, ORDEREXECUTED ASC
DEBUG 06/08/15 09:28: liquibase: Executing QUERY database command: select count(*) from MYSCHEMA.DATABASECHANGELOGLOCK
DEBUG 06/08/15 09:28: liquibase: Release Database Lock
DEBUG 06/08/15 09:28: liquibase: Executing UPDATE database command: UPDATE MYSCHEMA.DATABASECHANGELOGLOCK SET LOCKED = 0, LOCKEDBY = NULL, LOCKGRANTED = NULL WHERE ID = 1
INFO 06/08/15 09:28: liquibase: Successfully released change log lock

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