mybatis-SQL类

// Anonymous inner class
public String deletePersonSql() {
  return new SQL() {{
    DELETE_FROM("PERSON");
    WHERE("ID = #{id}");
  }}.toString();
}

// Builder / Fluent style
public String insertPersonSql() {
  String sql = new SQL()
    .INSERT_INTO("PERSON")
    .VALUES("ID, FIRST_NAME", "#{id}, #{firstName}")
    .VALUES("LAST_NAME", "#{lastName}")
    .toString();
  return sql;
}

// With conditionals (note the final parameters, required for the anonymous inner class to access them)
public String selectPersonLike(final String id, final String firstName, final String lastName) {
  return new SQL() {{
    SELECT("P.ID, P.USERNAME, P.PASSWORD, P.FIRST_NAME, P.LAST_NAME");
    FROM("PERSON P");
    if (id != null) {
      WHERE("P.ID like #{id}");
    }
    if (firstName != null) {
      WHERE("P.FIRST_NAME like #{firstName}");
    }
    if (lastName != null) {
      WHERE("P.LAST_NAME like #{lastName}");
    }
    ORDER_BY("P.LAST_NAME");
  }}.toString();
}

public String deletePersonSql() {
  return new SQL() {{
    DELETE_FROM("PERSON");
    WHERE("ID = #{id}");
  }}.toString();
}

public String insertPersonSql() {
  return new SQL() {{
    INSERT_INTO("PERSON");
    VALUES("ID, FIRST_NAME", "#{id}, #{firstName}");
    VALUES("LAST_NAME", "#{lastName}");
  }}.toString();
}

public String updatePersonSql() {
  return new SQL() {{
    UPDATE("PERSON");
    SET("FIRST_NAME = #{firstName}");
    WHERE("ID = #{id}");
  }}.toString();
}