[英]Run liquibase with changelog xml as stream input
我需要创建liquibase changelog,它在运行时具有所有必需的变更集,并使用该动态创建的changelog流运行liquibase。
我知道我们可以有静态的changelog xml文件,并提供它们以运行liquibase。
我想知道是否有一种方法可以加载此动态变更日志xml并运行liquibase?
我有相同的要求,我创建了一个新的资源访问器,该访问器加载了json字符串(对于xml来说是相同的)
public class Main {
private class StreamResourceAccessor extends AbstractResourceAccessor {
private String json;
public StreamResourceAccessor(String jsonString) {
super();
this.json = jsonString;
}
@Override
public Set<InputStream> getResourcesAsStream(String name) throws IOException {
InputStream stream = new ByteArrayInputStream(json.getBytes(StandardCharsets.UTF_8));
Set<InputStream> returnSet = new HashSet<>();
returnSet.add(stream);
return returnSet;
}
@Override
public Set<String> list(String arg0, String arg1, boolean arg2, boolean arg3, boolean arg4) throws IOException {
// TODO Auto-generated method stub
return null;
}
@Override
public ClassLoader toClassLoader() {
// TODO Auto-generated method stub
return null;
}
}
public static void main(String[] args) throws SQLException, LiquibaseException {
String url = "jdbc:postgresql://localhost/postgres";
Properties props = new Properties();
props.setProperty("user","postgres");
props.setProperty("password","");
//props.setProperty("ssl","true");
Connection connection = DriverManager.getConnection(url, props);
Database database = DatabaseFactory.getInstance().findCorrectDatabaseImplementation(new JdbcConnection(connection));
String jsonText = "{\"databaseChangeLog\":[{\"preConditions\":[{\"runningAs\":{\"username\":\"postgres\"}}]},{\"changeSet\":{\"id\":\"1\",\"author\":\"nvoxland\",\"changes\":[{\"createTable\":{\"tableName\":\"person\",\"columns\":[{\"column\":{\"name\":\"id\",\"type\":\"int\",\"autoIncrement\":true,\"constraints\":{\"primaryKey\":true,\"nullable\":false},}},{\"column\":{\"name\":\"firstname\",\"type\":\"varchar(50)\"}},{\"column\":{\"name\":\"lastname\",\"type\":\"varchar(50)\",\"constraints\":{\"nullable\":false},}},{\"column\":{\"name\":\"state\",\"type\":\"char(2)\"}}]}}]}},{\"changeSet\":{\"id\":\"2\",\"author\":\"nvoxland\",\"changes\":[{\"addColumn\":{\"tableName\":\"person\",\"columns\":[{\"column\":{\"name\":\"username\",\"type\":\"varchar(8)\"}}]}}]}},{\"changeSet\":{\"id\":\"3\",\"author\":\"nvoxland\",\"changes\":[{\"addLookupTable\":{\"tableName\":\"person\",\"existingTableName\":\"person\",\"existingColumnName\":\"state\",\"newTableName\":\"state\",\"newColumnName\":\"id\",\"newColumnDataType\":\"char(2)\",}}]}}]}";
Main main = new Main();
ResourceAccessor resourceAccessor = main.new StreamResourceAccessor(jsonText);
Liquibase liquibase = new Liquibase("hello.json", resourceAccessor, database);
try {
Contexts context = new Contexts();
liquibase.update(context);
} catch (Exception e) {
System.out.println(e);
}
}
}
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