Question

考虑以下Java中旧SQL查询的示例：

（我必须对此进行清理，因此它可能实际上无法编译。）

Connection con = null;
PreparedStatement stmt = null;
ResultSet result = null;
String whereClause = null;
whereClause = getWhereClause(clientSearch);
List l = new ArrayList();
int nextParam = 1;
boolean isPreClient = false;
String sql = "SELECT c." + CL_CLIENT_USER_ID + ",u." + US_FIRST_NM +
    ",u." + US_LAST_NM + ",u." + US_SSN + ",c." + CL_APP_SITE_CD +
    ",c." + CL_SYS_USER_ID + ",c." + CL_APP_USER_TYP_CD +
    ",c." + CL_PREREG_CMPL_CD +
    ",c." + CL_SPC_CAT_CD +
    ",c." + CL_REENLISTED_CD +
    ",u." + US_EMAIL_ADDR_TX +
    ",c." + CL_SPECIAL_PROGRAM_CD +
    " FROM " + DBT_APP_USERS + " u," + DBT_APP_CLIENT + " c " +
    whereClause +
    " ORDER BY " + US_LAST_NM + "," + US_FIRST_NM;


try {
    con = DbHelper.getConnection();
    stmt = con.prepareStatement(sql);
    if (clientSearch.isActive()) {
    stmt.setInt(nextParam, ConstantsDB.ACTIVE);
    nextParam++;
    stmt.setInt(nextParam, ConstantsDB.MODIFIED);
    nextParam++;
    } else {
    stmt.setInt(nextParam, ConstantsDB.INACTIVE);
    nextParam++;
    }
...

result = stmt.executeQuery();
    while (result.next()) {
    isPreClient = getIsPreClient(result.getInt(1), result);
    l.add(new ClientListVO(result.getInt(1), forJava(result.getString(2)),
        forJava(result.getString(3)), forJava(result.getString(4)), result.getInt(5),
        result.getInt(6), result.getInt(7), result.getDate(8),
        result.getDate(9), forJava(result.getString(10)), result.getDate(11), null,
        result.getInt(12));
    }
...

private String getWhereClause(ClientSearchVO clientSearch) {
    String whereClause;

    if (clientSearch.isActive()) {
        whereClause = " WHERE u." + US_SYS_USER_ID + "=c." + CL_SYS_USER_ID
                + " AND c." + CL_ELMT_STATUS_CD + " IN (?,?)";
    } else {
        whereClause = " WHERE u." + US_SYS_USER_ID + "=c." + CL_SYS_USER_ID
                + " AND c." + CL_ELMT_STATUS_CD + "=?";
    }

    if (clientSearch.getSsnFull() != null) {
        whereClause = whereClause + " AND u." + US_SSN + "=?";
    }
    if (clientSearch.isSearchPrereg()) {
        whereClause = whereClause
                + " AND LENGTH(U." + US_SSN + ")=?";
    }

    if (clientSearch.getSsnLastFour() != null) {
        whereClause = whereClause + " AND (substr(u." + US_SSN + ",6,4)=? OR u."
                + US_SSN + "=?)";
    }
    if (clientSearch.getLastName() != null) {
        whereClause = whereClause + " AND UPPER(u." + US_LAST_NM + ") like ?";
    }

    if (clientSearch.getClientId() > 0) {
        whereClause = whereClause + " AND c." + CL_CLIENT_USER_ID + "=?";
    }
    return whereClause;
}

我需要将这种代码转换为较新的应用程序。我正在使用Spring Data JPA，Spring Boot等的BOM版本1.5x。由于当前无法访问较新的Servlet版本，所以无法升级到Spring Boot 2。

上面的代码用于一个搜索屏幕，该屏幕正在从数据库表APP_CLIENT和APP_USERS中搜索和提取数据。由于WHERE子句是这样构建的，因此我不确定该怎么做。

我正在考虑做这样的事情：

public class ClientSearchResult {
    protected AppClient client;
    protected AppUsers user;

    public ClientSearchResult(AppClient client, AppUsers user) {
        this.client = client;
        this.user = user;
    }

    ...deligate methods
}

public interface AppClientRepo extends JpaRepository<AppClient, Long> {

    @Query("SELECT new ClientSearchResult(au, ac) FROM AppUsers au, AppClient ac "
            + "WHERE  "
            + "ORDER BY au.lastNm, au.firstNm ")
    List<ClientSearchResult> findBySearchCriteria(@Param("someParam01") long someParam01, @Param("someParam02") String someParam02);

}

但是，我不确定该对WHERE子句做什么。如果有人知道将此类代码转换为更现代的方法的好方法，我很想听听它。首选简单方法，但不是必需的。

将旧的SQL WHERE子句生成器更新为Spring Data解决方案？

0 个答案: