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adds support for schema information in plantuml notation

start with sqlite3 support.

for

CREATE TABLE Person(name TEXT PRIMARY KEY,born DATE,numberInLine INTEGER,wikidataurl TEXT,age FLOAT,ofAge BOOLEAN,lastmodified TIMESTAMP)

when called with parameter "packageName='Royals'"
the result should be:
http://diagrams.bitplan.com/render/png/0xff2b1e8c

grafik

with plantuml source code

package Royals {
  entity Person {
    name : TEXT <<PK>>
    born : DATE 
    numberInLine : INTEGER 
    wikidataurl : TEXT 
    age : FLOAT 
    ofAge : BOOLEAN 
    lastmodified : TIMESTAMP 
  }
}

Try it at http://diagrams.bitplan.com by cut&paste and selecting render-mode plantuml

Allow for list of sampleRecords when deriving CREATE and INSERT Table commands

This simplifies "schemaless" approach because missing columns can be identified more quickly with a larger sample data set .eg. a few dozen, hundred or event thousand records. And if a column is not in the first thousand records it's relevance is probably not so high any way and only corner cases will need the column.

work around https://bugs.python.org/issue41638

When a column-value is missing in one of the records in list of records the error message of the python library is:

sqlite3.ProgrammingError: You did not supply a value for binding 2
This is not helpful - improve the error message as asked for in https://bugs.python.org/issue41638 - workaround the problem as long as it is not fixed upstream.

Step 2:
improve with a message like:
INSERT INTO Pokemon (name,type) values (:name,:type)
failed: no value supplied for column 'type'

Step 2:
improve with a message like:
INSERT INTO Pokemon (name,type) values (:name,:type)
failed: for record #2 name='Raichu': no value supplied for column 'type'

Add copyTo function

refactor existing code from ProceedingsTitleParser

def copyTo(self,copyDB,profile=True):
        '''
        copy my content to another database
        
        Args:
            
           copyDB(Connection): the target database
           profile(boolean): if True show profile information
        '''
        startTime=time.time()
        dump="\n".join(self.c.iterdump())
        #cursor.executescript(dump)
        if profile:
            print("finished getting dump of %s in %5.1f s" % (self.dbname,time.time()-startTime))
        dumpErrors=self.executeDump(copyDB.c,dump,self.dbname,profile=profile)
        return dumpErrors

adds support to retrieve Schema information from sqlite3

see https://stackoverflow.com/a/63671566/1497139

for

CREATE TABLE Person(name TEXT PRIMARY KEY,born DATE,numberInLine INTEGER,wikidataurl TEXT,age FLOAT,ofAge BOOLEAN,lastmodified TIMESTAMP)

a list of dicts:

[ {'name': 'Person', 
  'columns': [
    {'cid': 0, 'name': 'name', 'type': 'TEXT', 'notnull': 0, 'dflt_value': None, 'pk': 1}, 
    {'cid': 1, 'name': 'born', 'type': 'DATE', 'notnull': 0, 'dflt_value': None, 'pk': 0}, 
    {'cid': 2, 'name': 'numberInLine', 'type': 'INTEGER', 'notnull': 0, 'dflt_value': None, 'pk': 0}, 
   {'cid': 3, 'name': 'wikidataurl', 'type': 'TEXT', 'notnull': 0, 'dflt_value': None, 'pk': 0},
   {'cid': 4, 'name': 'age', 'type': 'FLOAT', 'notnull': 0, 'dflt_value': None, 'pk': 0}, 
   {'cid': 5, 'name': 'ofAge', 'type': 'BOOLEAN', 'notnull': 0, 'dflt_value': None, 'pk': 0}, 
   {'cid': 6, 'name': 'lastmodified', 'type': 'TIMESTAMP', 'notnull': 0, 'dflt_value': None, 'pk': 0}
  ]
}
]

should be returned

profile should show batch handling with correct range and total time

e.g.

batch for         1 -       250 of      1000 items in    3.6 s ->    3.6 s
  batch for       251 -       500 of      1000 items in    3.5 s ->    7.8 s
  batch for       501 -       750 of      1000 items in    3.6 s ->   12.0 s
  batch for       751 -      1000 of      1000 items in    3.5 s ->   16.1 s
addData for      1000 items in   16.8 secs

addData for 1 - 247 of 247 items in 3.8 s -> 3.8 s

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