Question

I have been working on a java application that has a connection to a mysql database. I can connect and run queries but when I try to take a string and run it as a sql query I get this error.

Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INSERT INTO usageData (`COMID`,`Year`,`Month`,`kwhr`,`co2`) 
VALUES ('15650', '2' at line 3
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
at com.mysql.jdbc.Util.getInstance(Util.java:384)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1054)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3566)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3498)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1959)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2113)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2562)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1664)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1583)

Bellow is the code that I’m using to connect to the database

public static void main(String[] args) throws Exception {

    String dbms = "mysql";
    String serverName = "localhost";
    String portNumber = "8889";
    String DBName = "ConnectDatabase";
    String user = "root";
    String password = "root";

    ArrayList<Integer> yearList = new ArrayList<Integer>();
    ArrayList<CustomerRecord> customerRecordList = getCustomerRecords(args[0], yearList);
    ArrayList<ClimateRecord> climateRecordList = getClimateRecords(args[1]);


    StringBuffer buf = new StringBuffer();

    for (CustomerRecord record : customerRecordList) {
        buf.append(customerRecord2SQL(record));
    }

    for (int i = (climateRecordList.size() - 1); i >= 0; i--) {
        //for (ClimateRecord record : climateRecordList) {
        ClimateRecord record = climateRecordList.get(i);
        buf.append(climateRecord2SQL(record));
    }

    buf.append(cityStats(dbms,serverName,portNumber,DBName,user,password));
    buf.append(zipStats(dbms,serverName,portNumber,DBName,user,password));

    System.out.println(buf.toString());

    //here is the code to go ahead and update the database
    Connection con = null;

    con = DriverManager.getConnection("jdbc:" + dbms + "://" + serverName + ":" + portNumber + "/" + DBName + "?user="+user+"&password=" + password);

    Statement stmt = con.createStatement();

    stmt.executeUpdate(buf.toString());

    BufferedWriter out = new BufferedWriter(new FileWriter(args[2]));
    out.write(buf.toString());
    out.close();
}

Answer 1

This is not a connection issue. It means that something is wrong with your SQL statement. Try copying the statement as is and executing it directly in the database. See what is wrong and then correct it in the Java code.

I notice that the single quotes around the field names look fancy. That might be a problem.