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data-utils

Groovy data utils. The main issue I needed to address was the reliance on System classloader in @Grab to handle JDBC drivers. This is very inconvenient when using an IDE such as Gade and Ride as it requires you to copy jars to the lib folder and restart the IDE in order for the System classpath to be updated.

However, with some Reflection magic it is possible to do without this. This is what se.alipsa.groovy.datautil.SqlUtil does.

Here is an example:

@Grab('se.alipsa.groovy:data-utils:1.0.5')
@Grab('org.postgresql:postgresql:42.4.0')

import se.alipsa.groovy.datautil.SqlUtil

def idList = new ArrayList()

SqlUtil.withInstance("jdbc:postgresql://localhost:5432/mydb", "dbUser", "dbPasswd", "org.postgresql.Driver") { sql ->
    sql.query('SELECT id FROM project') { rs ->
        while (rs.next()) {
            idList.add(rs.getLong(1))
        }
    }
}

See test.alipsa.groovy.datautil.SqlUtilTest for more examples!

The other thing are some complementary operations to deal with Tablesaw data, e.g. the ability to create frequency tables. See test.alipsa.groovy.datautil.TableUtilTest for usage examples!

Using the dependency

data-utils is available from maven central

Groovy:

implementation "se.alipsa.groovy:data-utils:1.0.5"

Maven:

<dependency>
    <groupId>se.alipsa.groovy</groupId>
    <artifactId>data-utils</artifactId>
    <version>1.0.5</version>
</dependency>

Version history

1.0.5, in progress

  • upgrade Tablesaw dependency overrides
  • add putAt method in GTable allowing the shorthand syntax table[0,1] = 12 and table[0, 'columnName'] = 'foo' to change data.
  • add possiblity to cast a GTable to a Grid

1.0.4, 2023.08-06

  • upgrade to jdk17
  • add conversions to/from Tablesaw and Matrix
  • add wrappers to Gtable for all Table methods returning a Table
  • move most of the Normalization code to the Matrix-stats package and adjust accordingly
  • upgrade dependencies for groovy, tablesaw, SODS, dom4j

1.0.3, 2022-12-24

  • upgrade transient dependencies with cve issues
  • upgrade to groovy 4.0.6
  • change groovy dependencies to compileOnly so that consumers of this library can use whatever compatible version of Groovy that they want without conflicts.

1.0.2, 2022-08-17

  • Add TableUtil with support for frequency tables

1.0.1, 2022-07-25

  • Upgrade to Groovy 4.0.4
  • Build script fixes

1.0.0, 2022-07-15

  • initial release