生成SQL查询条件的工具类

import org.hibernate.criterion.MatchMode;

/**

 * 生成SQL查询条件的工具类。

 *

 * @author Administrator

 *

 */

public class SqlUtils {

 private static final String AND = " and ";

 private static final String LIKE = " like ";

 private static final String EQ = " = ";

 private static final String GE = " >= ";

 private static final String LE = " <= ";

 private static final String GT = " > ";

 private static final String LT = " < ";

//等于

 public static String eq(String propertyName, Object value) {

  if (value.getClass().equals(java.lang.String.class)) {

   return AND + propertyName + EQ + formatSQLParam(value.toString());

  }

  return AND + propertyName + EQ + value.toString();

 }

//大于等于

 public static String ge(String propertyName, Object value) {

  if (value.getClass().equals(java.lang.String.class)) {

   return AND + propertyName + GE + formatSQLParam(value.toString());

  }

  return AND + propertyName + GE + value.toString();

 }

//小于等于

 public static String le(String propertyName, Object value) {

  if (value.getClass().equals(java.lang.String.class)) {

   return AND + propertyName + LE + formatSQLParam(value.toString());

  }

  return AND + propertyName + LE + value.toString();

 }

//大于

 public static String gt(String propertyName, Object value) {

  if (value.getClass().equals(java.lang.String.class)) {

   return AND + propertyName + GT + formatSQLParam(value.toString());

  }

  return AND + propertyName + GT + value.toString();

 }

//小于

 public static String lt(String propertyName, Object value) {

  if (value.getClass().equals(java.lang.String.class)) {

   return AND + propertyName + LT + formatSQLParam(value.toString());

  }

  return AND + propertyName + LT + value.toString();

 }

//模糊查询

 public static String like(String propertyName, String value, MatchMode matchMode) {

  return AND + propertyName + LIKE + formatSQLParam(matchMode.toMatchString(value));

 }

 public static String like(String propertyName, String value) {

  return like(propertyName, value, MatchMode.ANYWHERE);

 }

 private static String formatSQLParam(String value) {

  return "'" + value + "'";

 }

}