在使用elasticsearch-sql框架中,怎么使用sql数据插入ES
时间: 2023-11-27 17:52:21 浏览: 211
使用elasticsearch-sql框架,可以通过以下步骤将SQL数据插入ES:
1. 创建一个ES索引,定义字段映射
2. 使用ES-SQL框架连接ES,执行SQL查询获取数据
3. 遍历查询结果,使用ES-SQL框架提供的API将数据插入ES
下面是一个示例代码,演示如何使用ES-SQL框架将SQL数据插入ES:
```java
import io.github.iamazy.elasticsearch.dsl.sql.parser.SqlParser;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.nlpcn.es4sql.exception.SqlParseException;
import org.nlpcn.es4sql.query.QueryAction;
import org.nlpcn.es4sql.query.SqlElasticRequestBuilder;
import java.io.IOException;
import java.sql.*;
public class SqlToEs {
// 定义ES索引名称
private static final String INDEX_NAME = "my_index";
// 定义ES连接客户端
private RestHighLevelClient client;
// 定义SQL查询语句
private String sql = "SELECT * FROM my_table WHERE id > 100";
public SqlToEs() {
// 初始化ES连接客户端
client = new RestHighLevelClient();
}
public void insert() throws SQLException, IOException, SqlParseException {
// 解析SQL查询语句
SqlParser sqlParser = new SqlParser();
QueryAction queryAction = sqlParser.parseSelect(sql);
// 构建ES查询请求
SqlElasticRequestBuilder requestBuilder = queryAction.explain();
SearchSourceBuilder sourceBuilder = requestBuilder.getSourceBuilder();
sourceBuilder.query(QueryBuilders.matchAllQuery());
String query = sourceBuilder.toString();
// 执行SQL查询获取数据
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/my_database", "user", "password");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(query);
// 遍历查询结果,将数据插入ES
BulkRequest request = new BulkRequest();
while (rs.next()) {
// 创建一个ES文档
Map<String, Object> document = new HashMap<>();
document.put("id", rs.getInt("id"));
document.put("name", rs.getString("name"));
document.put("age", rs.getInt("age"));
// 添加到批量请求中
request.add(new IndexRequest(INDEX_NAME).source(document));
}
// 执行批量请求
BulkResponse bulkResponse = client.bulk(request, RequestOptions.DEFAULT);
if (bulkResponse.status() == RestStatus.OK) {
System.out.println("数据插入成功!");
}
}
}
```
这里使用ES-SQL框架解析SQL查询语句,并构建ES查询请求。然后执行SQL查询获取数据,并遍历查询结果,将数据插入ES。最后使用ES客户端执行批量请求,将数据插入ES。
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