SAP HANA 找不到表/视图

Question

I am trying to connect HANA database which is running in Google Cloud Platform. Here is my java code,

try {
        Class.forName("com.sap.db.jdbc.Driver");
        String url = "jdbc:sap://myhost:39015/?";
        String user = "MYUSER";
        String password = "PASSWORD";
        System.out.println("Connecting to HANA..!");
        Connection cn = DriverManager.getConnection(url, user, password);
        System.out.println("Connection to HANA successful!");
        ResultSet rs = cn.createStatement().executeQuery("select * from \"TWEETS\"");
        rs.next();
        System.out.println(rs.getString(1));
    } catch (Exception e) {
        e.printStackTrace();
    }

The TWEETS table exists under SYSTEM schema, I can able to query TWEETS table using HANA sudio (Eclipse plugin). But, when I try to query from java code the following exception occurs.

com.sap.db.jdbc.exceptions.JDBCDriverException: SAP DBTech JDBC: [259] (at 14): invalid table name:  Could not find table/view TWEETS in schema SYSTEM: line 1 col 15 (at pos 14)
    at com.sap.db.jdbc.exceptions.SQLExceptionSapDB.createException(SQLExceptionSapDB.java:334)
    at com.sap.db.jdbc.exceptions.SQLExceptionSapDB.generateDatabaseException(SQLExceptionSapDB.java:165)
    at com.sap.db.jdbc.packet.ReplyPacket.buildExceptionChain(ReplyPacket.java:104)
    at com.sap.db.jdbc.ConnectionSapDB.execute(ConnectionSapDB.java:1110)
    at com.sap.db.jdbc.ConnectionSapDB.execute(ConnectionSapDB.java:854)
    at com.sap.db.jdbc.StatementSapDB.sendCommand(StatementSapDB.java:925)

Note: I tried below combinations as well, but no luck!

 1. "select * from TWEETS" 
 2. "select * from SYSTEM.TWEETS"
 3. "select * from \"TWEETS\" 
 4. "select * from \"SYSTEM\".\"TWEETS\""

table creation command,

    CREATE COLUMN TABLE TWEETS(
    "ID" INTEGER NOT NULL,
    "USER_NAME" NVARCHAR(100),
    "CREATED_AT" DATE,
    "TEXT" NVARCHAR (140),
    "HASH_TAGS" NVARCHAR (100),
    PRIMARY KEY("ID")
    );

Could you please help me to figure out the problem here? Thanks!

Answer 1

Following the documentation provided here , we can observe that there is a problem with the port that you've used in the SAP JDBC connection string.

The port should be 3 < instance number>15; for example, 30015, if the instance is 00.

By the above explanation, making the necessary changes in the connection string should resolve the issue.

Corrected connection string is now the following (based on the parameters provided in the question):

String url = "jdbc:sap://myhost:30015/?databaseName=TWEETS&user=MYUSER&password=PASSWORD";

Hope this helps!

Answer 2

尝试

"select * from SYSTEM.\"TWEETS\""