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Copy pathSelectQuery.java
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executable file
·141 lines (109 loc) · 3.05 KB
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package devinfalgoust.sqlquerygenerator.select;
import java.util.List;
import devinfalgoust.sqlquerygenerator.Query;
public class SelectQuery implements Query {
private String tableName;
private Boolean distinct;
private List<String> selectFields;
private List<SelectQueryField> whereFields;
private List<String> orderByFields;
private Boolean ascending;
public SelectQuery(String tableName) {
this.tableName = tableName;
distinct = Boolean.FALSE;
ascending = null;
}
@Override
public String generate() {
StringBuilder queryBuilder = new StringBuilder();
queryBuilder.append("SELECT ");
if (distinct) {
queryBuilder.append("DISTINCT ");
}
if (selectFields.isEmpty()) {
queryBuilder.append("*");
} else {
for (int i = 0; i < selectFields.size(); i++) {
queryBuilder.append(selectFields.get(i));
if (i < selectFields.size() - 1) {
queryBuilder.append(", ");
}
}
}
queryBuilder.append(" FROM ").append(tableName);
if (!whereFields.isEmpty()) {
queryBuilder.append(" WHERE ");
for (int i = 0; i < whereFields.size(); i++) {
SelectQueryField field = whereFields.get(i);
queryBuilder.append(field.getName());
switch (whereFields.get(i).getOperator()) {
case EQUAL:
queryBuilder.append(" = ");
break;
case NOT_EQUAL:
queryBuilder.append(" <> ");
break;
case GREATER_THAN:
queryBuilder.append(" > ");
break;
case GREATER_THAN_OR_EQUAL:
queryBuilder.append(" >= ");
break;
case LESS_THAN:
queryBuilder.append(" < ");
break;
case LESS_THAN_OR_EQUAL:
queryBuilder.append(" <= ");
break;
case LIKE:
queryBuilder.append(" LIKE ");
break;
default:
// Should never reach here
break;
}
if(field.isString()) {
queryBuilder.append("'").append(field.getStringValue()).append("'");
} else {
queryBuilder.append(field.getIntValue().toString());
}
if (i < whereFields.size() - 1) {
queryBuilder.append(" AND ");
}
}
}
if (!orderByFields.isEmpty()) {
queryBuilder.append(" ORDER BY ");
for (int i = 0; i < orderByFields.size(); i++) {
queryBuilder.append(orderByFields.get(i));
if (i < orderByFields.size() - 1) {
queryBuilder.append(", ");
}
}
}
if (ascending != null) {
if (ascending) {
queryBuilder.append(" ASC");
} else {
queryBuilder.append(" DESC");
}
}
queryBuilder.append(";");
return queryBuilder.toString();
}
public void setDistinct(Boolean distinct) {
this.distinct = distinct;
}
public void setAscending(Boolean ascending) {
this.ascending = ascending;
}
public void setSelectFields(List<String> selectFields) {
this.selectFields = selectFields;
}
public void setWhereFields(List<SelectQueryField> whereFields) {
this.whereFields = whereFields;
}
public void setOrderByFields(List<String> orderByFields) {
this.orderByFields = orderByFields;
}
}