[TD-2005]<feature>: add ErrorNumber in JDBC driver

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConstants.java

@@ -19,12 +19,12 @@ import java.util.Map;
 
 public abstract class TSDBConstants {
 
-    public static final String STATEMENT_CLOSED = "Statement already closed.";
-    public static final String DEFAULT_PORT = "6200";
+    public static final String STATEMENT_CLOSED = "statement is closed";
     public static final String UNSUPPORT_METHOD_EXCEPTIONZ_MSG = "this operation is NOT supported currently!";
     public static final String INVALID_VARIABLES = "invalid variables";
-    public static final String RESULT_SET_IS_CLOSED = "resultSet is closed.";
+    public static final String RESULT_SET_IS_CLOSED = "resultSet is closed";
 
+    public static final String DEFAULT_PORT = "6200";
     public static Map<Integer, String> DATATYPE_MAP = null;
 
     public static final long JNI_NULL_POINTER = 0L;

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBError.java

+package com.taosdata.jdbc;
+
+import java.sql.SQLException;
+import java.util.HashMap;
+import java.util.Map;
+
+public class TSDBError {
+    private static Map<Integer, String> TSDBErrorMap = new HashMap<>();
+
+    static {
+        TSDBErrorMap.put(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED, "connection already closed");
+        TSDBErrorMap.put(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD, "this operation is NOT supported currently!");
+        TSDBErrorMap.put(TSDBErrorNumbers.ERROR_INVALID_VARIABLE, "invalid variables");
+        TSDBErrorMap.put(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED, "statement is closed");
+        TSDBErrorMap.put(TSDBErrorNumbers.ERROR_RESULTSET_CLOSED, "resultSet is closed");
+        /**************************************************/
+        TSDBErrorMap.put(TSDBErrorNumbers.ERROR_SUBSCRIBE_FAILED, "failed to create subscription");
+    }
+
+    public static String wrapErrMsg(String msg) {
+        return "TDengine Error: " + msg;
+    }
+
+    public static SQLException createSQLException(int errorNumber) {
+        // JDBC exception code is less than 0x2350
+        if (errorNumber <= 0x2350)
+            return new SQLException(TSDBErrorMap.get(errorNumber));
+        // JNI exception code is
+        return new SQLException(wrapErrMsg(TSDBErrorMap.get(errorNumber)));
+    }
+}

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBErrorNumbers.java

 package com.taosdata.jdbc;
 
 public class TSDBErrorNumbers {
-    private static final int ERROR_XXX = 0x2301;    //
 
+    public static final int ERROR_CONNECTION_CLOSED = 0x2301;   // connection already closed
+    public static final int ERROR_UNSUPPORTED_METHOD = 0x2302;  //this operation is NOT supported currently!
+    public static final int ERROR_INVALID_VARIABLE = 0x2303;    //invalid variables
+    public static final int ERROR_STATEMENT_CLOSED = 0x2304;    //statement already closed
+    public static final int ERROR_RESULTSET_CLOSED = 0x2305;    //resultSet is closed
+
+    public static final int ERROR_SUBSCRIBE_FAILED = 0x2350;    //failed to create subscription
+
+    private TSDBErrorNumbers() {
+    }
 }

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBStatement.java

@@ -17,10 +17,9 @@ package com.taosdata.jdbc;
 import java.sql.*;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.concurrent.TimeUnit;
 
 public class TSDBStatement implements Statement {
-    private TSDBJNIConnector connector = null;
+    private TSDBJNIConnector connector;
 
     /**
      * To store batched commands
@@ -67,13 +66,12 @@ public class TSDBStatement implements Statement {
     }
 
     public ResultSet executeQuery(String sql) throws SQLException {
-        if (isClosed) {
-            throw new SQLException("Invalid method call on a closed statement.");
+        if (isClosed()) {
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED);
         }
 
         // TODO make sure it is not a update query
         pSql = this.connector.executeQuery(sql);
-
         long resultSetPointer = this.connector.getResultSet();
         if (resultSetPointer == TSDBConstants.JNI_CONNECTION_NULL) {
             this.connector.freeResultSet(pSql);
@@ -98,8 +96,8 @@ public class TSDBStatement implements Statement {
     }
 
     public int executeUpdate(String sql) throws SQLException {
-        if (isClosed) {
-            throw new SQLException("Invalid method call on a closed statement.");
+        if (isClosed()) {
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED);
         }
 
         // TODO check if current query is update query
@@ -131,25 +129,33 @@ public class TSDBStatement implements Statement {
     }
 
     public int getMaxFieldSize() throws SQLException {
+        if (isClosed()) {
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED);
+        }
+
         return 0;
-//        throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
     }
 
     public void setMaxFieldSize(int max) throws SQLException {
-        if (isClosed())
-            throw new SQLException(TSDBConstants.STATEMENT_CLOSED);
+        if (isClosed()) {
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED);
+        }
 
         throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
     }
 
     public int getMaxRows() throws SQLException {
-        if (isClosed())
-            throw new SQLException(TSDBConstants.STATEMENT_CLOSED);
+        if (isClosed()) {
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED);
+        }
         // always set maxRows to zero, meaning unlimitted rows in a resultSet
         return 0;
     }
 
     public void setMaxRows(int max) throws SQLException {
+        if (isClosed()) {
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_STATEMENT_CLOSED);
+        }
         // always set maxRows to zero, meaning unlimited rows in a resultSet
     }