java JDBC MYSQL 语法错误

Question

Well, I have got some problems with this sql syntax.

public static void newTable(String tableName, String columnName, String columnType) {

    try {

        PreparedStatement pst = conn.prepareStatement
                ("CREATE TABLE `" + tableName + "`" + "(`" +columnName + "`  `" +  columnType + "` )");

        //PreparedStatement pst = conn.prepareStatement("CREATE TABLE teszt2 ( asd VARCHAR(255) );" ); //THIS IS WORKING

        //pst.setString(1, tableName);
        //pst.setString(2, columnName);
        //pst.setString(3, columnType);
        pst.execute();

    } catch (SQLException e) {
        e.printStackTrace();
    }

}

This is the error that I got: Every time I run this I got this error. I assume that I have some problems with my query. Although, the one without strings in it is working fine.

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 '`VARCHAR(255)` )' at line 1

Answer 1

According to the comments in your code, this works:

CREATE TABLE teszt2 ( asd VARCHAR(255) );

But this doesn't:

CREATE TABLE `teszt2` ( `asd` `VARCHAR(255)` );

So I guess remove the back-ticks and use the "working" version:

PreparedStatement pst = conn.prepareStatement
            ("CREATE TABLE " + tableName + " (" +columnName + " " +  columnType + " )");

Or at least remove them from the type specifier:

PreparedStatement pst = conn.prepareStatement
            ("CREATE TABLE `" + tableName + "`" + "(`" +columnName + "`  " +  columnType + " )");