Java SDK
GreptimeDB Java SDK 使用 gRPC 与数据库通信， 请参考 Java SDK 文档查看更多 SDK 使用的相关内容。
请使用以下信息连接到 GreptimeCloud：
- Host:
<host> - Port:
4001 - Database:
<dbname> - Username:
<username> - Password:
<password>
下方的代码片段展示了如何使用 Java SDK 建立一个 client 连接对象：
java
String endpoint = "<host>:4001";
AuthInfo authInfo = new AuthInfo("<username>", "<password>");
GreptimeOptions opts = GreptimeOptions.newBuilder(endpoint)
.authInfo(authInfo)
.writeMaxRetries(1)
.readMaxRetries(2)
.routeTableRefreshPeriodSeconds(-1)
.build();
GreptimeDB greptimeDB = new GreptimeDB();
if (!greptimeDB.init(opts)) {
throw new RuntimeException("Fail to start GreptimeDB client");
}String endpoint = "<host>:4001";
AuthInfo authInfo = new AuthInfo("<username>", "<password>");
GreptimeOptions opts = GreptimeOptions.newBuilder(endpoint)
.authInfo(authInfo)
.writeMaxRetries(1)
.readMaxRetries(2)
.routeTableRefreshPeriodSeconds(-1)
.build();
GreptimeDB greptimeDB = new GreptimeDB();
if (!greptimeDB.init(opts)) {
throw new RuntimeException("Fail to start GreptimeDB client");
}在创建了 GreptimeDB 客户端之后，你可以在写入数据或查询数据时设置数据库。例如查询数据：
java
QueryRequest request = QueryRequest.newBuilder()
.exprType(SelectExprType.Sql)
.ql("SELECT * FROM monitor;")
.databaseName("<dbname>")
.build();QueryRequest request = QueryRequest.newBuilder()
.exprType(SelectExprType.Sql)
.ql("SELECT * FROM monitor;")
.databaseName("<dbname>")
.build();