anchor.diff:  ```
   You need to pass an implementation of `java.util.Collection` to one of these parameters (for example `java.util.List` or `java.util.Set`).
   
  -Under the covers *rxjava2-jdbc* does not use `PreparedStatement.setArray` because of the patchy support for this method (not supported by DB2 or MySQL for instance) and the extra requirement of specifying a column type.
  +Under the covers _rxjava2-jdbc_ does not use `PreparedStatement.setArray` because of the patchy support for this method (not supported by DB2 or MySQL for instance) and the extra requirement of specifying a column type.
   
   Note that databases normally have a limit on the number of parameters in a statement (or indeed the size of array that can be passed in `setArray`). For Oracle it's O(1000), H2 it is O(20000).
   
  
positive.code:   .count();
  ```
  === Insert a Null Blob
  This requires *either* a special call (```parameterBlob(String)``` to identify the parameter as a CLOB:
  ```java
  Flowable<Integer> count = db
    .update("insert into person_blob(name,document) values(?,?)")
  
negative.code: 
  Parameters are passed to individual queries but can also be used as a streaming source to prompt the query to be run many times.
  
  Parameters can be named or anonymous. Named parameters are not supported natively by the JDBC specification but _rxjava2-jdbc_ does support them.
  
  This is sql with a named parameter:
  
  