使用Java操作MarkLogic
在Java中使用MarkLogic可以通过MarkLogic Java API来实现。下面是使用Java操作MarkLogic的步骤及示例代码：
1. 添加Maven依赖
在项目的pom.xml文件中，添加以下Maven依赖以引入MarkLogic Java API：
<dependency>
<groupId>com.marklogic</groupId>
<artifactId>java-client-api</artifactId>
<version>4.3.0</version>
</dependency>
2. 创建MarkLogic连接
使用MarkLogicClientFactory创建一个MarkLogicConnector对象来连接MarkLogic数据库：
import com.marklogic.client.DatabaseClient;
import com.marklogic.client.DatabaseClientFactory;
import com.marklogic.client.DatabaseClientFactory.Authentication;
import com.marklogic.client.DatabaseClientFactory.DigestAuthContext;
// 建立连接
final String host = "localhost";
final int port = 8000;
final String username = "admin";
final String password = "admin";
final String database = "Documents";
DatabaseClient client = DatabaseClientFactory.newClient(host, port, database,
new DigestAuthContext(username, password));
3. 数据插入
使用DocumentManager创建一个文档并将其插入到MarkLogic数据库中：
import com.marklogic.client.document.DocumentManager;
import com.marklogic.client.document.GenericDocument;
import com.marklogic.client.io.StringHandle;
// 插入文档
DocumentManager documentManager = client.newDocumentManager();
StringHandle content = new StringHandle("This is some example content");
GenericDocument document = documentManager.newDocument("/example/doc1", content);
documentManager.write(document);
4. 数据查询
使用QueryBuilder来构建查询，并使用SearchManager执行查询：
import com.marklogic.client.query.MatchDocumentSummary;
import com.marklogic.client.query.MatchLocation;
import com.marklogic.client.query.QueryManager;
import com.marklogic.client.query.StringQueryDefinition;
// 查询数据
QueryManager queryManager = client.newQueryManager();
StringQueryDefinition queryDef = queryManager.newStringDefinition();
queryDef.setCriteria("example");
MatchDocumentSummary[] results = queryManager.search(queryDef, 10);
for (MatchDocumentSummary result : results) {
System.out.println("URI: " + result.getUri());
for (MatchLocation match : result.getMatchLocations()) {
System.out.println("Match: " + match.getAllSnippetText());
}
}
5. 数据修改
使用DocumentManager来修改文档内容：
import com.marklogic.client.document.DocumentPatchBuilder;
import com.marklogic.client.document.DocumentPatchHandle;
// 修改文档
String documentUri = "/example/doc1";
DocumentPatchHandle patchHandle = new DocumentPatchHandle();
DocumentPatchBuilder patchBuilder = documentManager.newPatchBuilder();
patchBuilder.insertFragment("/doc/content", DocumentPatchBuilder.Position.LAST_CHILD, "<tag>This is a new tag</tag>");
patchHandle = patchBuilder.build();
documentManager.patch(documentUri, patchHandle);
6. 数据删除
使用DocumentManager来删除文档：
import com.marklogic.client.document.DocumentUriTemplate;
import com.marklogic.client.document.DocumentWriteSet;
import com.marklogic.client.document.DocumentWriteOperation;
import com.marklogic.client.document.DocumentWriteOperation.OperationType;
// 删除文档
DocumentUriTemplate uriTemplate = documentManager.newDocumentUriTemplate("xml");
String uri = uriTemplate.insertDefaultExtension("/example/doc1");
DocumentWriteSet writeSet = documentManager.newWriteSet();
DocumentWriteOperation deleteOperation = documentManager.newDelete(uri);
writeSet.add(deleteOperation);
documentManager.write(writeSet);
以上是使用Java操作MarkLogic数据库的基本步骤和示例代码。根据需要，可以根据具体的业务逻辑和需求来使用MarkLogic Java API进行更复杂的操作。
