条件SQL查询和JDBC

Question

I'm writing a program utilizing JDBC that will check if a table exists and create it if it doesn't.

I was planning to include the following:

String query = (some query);
int createIfNotExists = connection.createStatement().executeUpdate(query);

But it's not allowing me to use "IF" in my SQL query. Why is this? Do I need to use some different type of driver? Or is IF just not allowed with JDBC? Has anyone dealt with this before, and how'd you handle it?

Answer 1

DatabaseMetaData md = connection.getMetaData();  
String query = "";
boolean exist=false  

ResultSet rs = md.getTables(null, null, "table_name", null);

while (rs.next()) {
  exist = True ;
}  

if(!exist){
       query="CREATE TABLE table_name ...";
       connection.createStatement().executeUpdate(query);
}