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Java orm for Postgres or Mysql with migration system and connection pool

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package com.wizarius.orm.database.actions;

import com.wizarius.orm.database.DBException;
import com.wizarius.orm.database.connection.DBConnectionPool;
import com.wizarius.orm.database.data.DBSignType;
import com.wizarius.orm.database.data.DBWhereType;
import com.wizarius.orm.database.entityreader.DBParsedFieldsList;

/**
 * @author Vladyslav Shyshkin
 * Date: 22.03.2020
 * Time: 17:57
 */
public abstract class WizAbstractWhereAction> extends WizAbstractDBAction {
    public WizAbstractWhereAction(DBConnectionPool pool, DBParsedFieldsList fields) {
        super(pool, fields);
    }

    /**
     * Setup where filed
     *
     * @param field  filed name
     * @param object field value
     */
    public T where(String field, Object object) {
        whereQueryBuilder.where(field, object);
        return getInstance();
    }

    /**
     * Setup where filed
     *
     * @param field    filed name
     * @param object   field value
     * @param signType sign type
     */
    public T where(String field, Object object, DBSignType signType) {
        whereQueryBuilder.where(field, object, signType);
        return getInstance();
    }

    /**
     * Setup where filed
     *
     * @param key   database field name
     * @param value database field value
     * @param clazz instance of object
     * @throws DBException on unable to build where condition
     */
    public T where(String key, Object value, Class clazz) throws DBException {
        whereQueryBuilder.where(key, value, clazz);
        return getInstance();
    }

    /**
     * Setup where query
     *
     * @param query custom query
     */
    public T where(String query) {
        whereQueryBuilder.where(query);
        return getInstance();
    }

    /**
     * Set where type
     *
     * @param type new where type
     */
    public T setWhereType(DBWhereType type) {
        whereQueryBuilder.setWhereType(type);
        return getInstance();
    }

    /**
     * Returns instance of child class
     *
     * @return child class
     */
    @SuppressWarnings("unchecked")
    private T getInstance() {
        return (T) this;
    }
}