How to increment primary key without check AUTOINCREMENT in MySQL - mysql

Question

How to increment primary key without check AUTOINCREMENT in MySQL?
My Example:
Tax.java
/*
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* and open the template in the editor.
*/
package newpackage;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.persistence.*;
import javax.transaction.UserTransaction;
import javax.validation.constraints.NotNull;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlTransient;
/**
*
* #author gile
*/
#Entity
#Table(name = "tax", catalog = "invoicedb", schema = "")
#XmlRootElement
#NamedQueries({
#NamedQuery(name = "Tax.findAll", query = "SELECT t FROM Tax t"),
#NamedQuery(name = "Tax.findByIdtax", query = "SELECT t FROM Tax t WHERE t.idtax = :idtax"),
#NamedQuery(name = "Tax.findByValue", query = "SELECT t FROM Tax t WHERE t.value = :value"),
**#NamedQuery(name = "Tax.findMaxID", query = "SELECT MAX (t.idtax) from Tax t")})** // I write this query to find max value of primary key. how to find max ?
public class Tax implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#Basic(optional = false)
#NotNull
#Column(name = "idtax")
private Integer idtax;
#Basic(optional = false)
#NotNull
#Column(name = "value")
private BigDecimal value;
#OneToMany(cascade = CascadeType.ALL, mappedBy = "taxid")
private List<Invoicedetails> invoicedetailsList;
public Tax() {
}
public Tax(Integer idtax) {
this.idtax = idtax;
}
public Tax(Integer idtax, BigDecimal value) {
this.idtax = idtax;
this.value = value;
}
public Integer getIdtax() {
return idtax;
}
public void setIdtax(Integer idtax) {
this.idtax = idtax;
}
public BigDecimal getValue() {
return value;
}
public void setValue(BigDecimal value) {
this.value = value;
}
#XmlTransient
public List<Invoicedetails> getInvoicedetailsList() {
return invoicedetailsList;
}
public void setInvoicedetailsList(List<Invoicedetails> invoicedetailsList) {
this.invoicedetailsList = invoicedetailsList;
}
#Override
public int hashCode() {
int hash = 0;
hash += (idtax != null ? idtax.hashCode() : 0);
return hash;
}
#Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Tax)) {
return false;
}
Tax other = (Tax) object;
if ((this.idtax == null && other.idtax != null) || (this.idtax != null && !this.idtax.equals(other.idtax))) {
return false;
}
return true;
}
#Override
public String toString() {
return String.format("%.2f %%",value);
}
#Transient
private String taxvalueString;
public String getTaxvalueString() {
return String.format(" %.2f %%",value);
}
public void setTaxvalueString(String taxvalueString) {
this.taxvalueString = taxvalueString;
}
}

Answer 1

You can add a method in Tax Class with PrePersit annotation for creating PK (idtax)
like
#PrePersist
private void generateID() {
// Read existing Tax record, finde new id and set pk here.
}