NullExpression.java

package com.github.walker.easydb.criterion;

import com.github.walker.easydb.assistant.MappingUtil;

/**
 * Constrains a property to be null
 *
 * @author HuQingmiao
 */
public class NullExpression extends Criteria {

    private String colName;

    protected NullExpression(String propertyName) {
        this.colName = MappingUtil.getColumnName(propertyName);
    }

    public String toSqlString() {
        return colName + " IS NULL";
    }

}