如何通过sqlite android中搜索词的首字母获取所有数据？

Question

我有搜索字符串。例如：如果我键入 co，我需要获取键入的 c 的所有起始字母并显示列表。

但它只显示准确的 ca 列表。如何仅显示输入字符串中字母表的首字母。

在下面的查询中，显示文本是 table，它显示给定输入的描述。

public List<BaseTableOfContents> searchNodesForText(@Nullable String rootHash,
                                                            @Nullable String substring) {
        List<BaseTableOfContentsNode> returnValue = null;
        if (StringUtils.isNotEmpty(substring) && StringUtils.isNotEmpty(rootHash)) {
            String likeQuery = "%" + substring + "%";
            Cursor cursor = mDatabase.query(Tables.TOC_NODES, null,
                                            Columns.TOC_ROOT_NODE_HASH + " = ? AND (" +
                                            Columns.DISPLAY_TEXT + " LIKE ? OR " +
                                            Columns.TOC_IS_TITLE_BREAK + " = 1)",
                                            new String[] { rootHash, likeQuery }, null, null,
                                            Columns.TOC_SORT_ORDER + ORDER_ASCENDING);

            returnValue = getNodesFromCursor(cursor);
            cursor.close();
        }

下面是硬编码的。您可以看到硬编码的 "compensacion" 文本。但是如果我输入 compensacion，它应该列出所有以 "c"

开头的列表

public List<BaseTableOfContents> searchNodesForText(@Nullable String rootHash,
                                                            @Nullable String substring) {
        List<BaseTableOfContentsNode> returnValue = null;
        if (StringUtils.isNotEmpty(substring) && StringUtils.isNotEmpty(rootHash)) {
            String likeQuery = "%" + "compensacion" + "%"; //here I hardcoded. Only when I give exact term, it's displaying, otherwise it's not displaying.
            Cursor cursor = mDatabase.query(Tables.TOC_NODES, null,
                                            Columns.TOC_ROOT_NODE_HASH + " = ? AND (" +
                                            Columns.DISPLAY_TEXT + " LIKE ? OR " +
                                            Columns.TOC_IS_TITLE_BREAK + " = 1)",
                                            new String[] { rootHash, likeQuery }, null, null,
                                            Columns.TOC_SORT_ORDER + ORDER_ASCENDING);

            returnValue = getNodesFromCursor(cursor);
            cursor.close();
        }

Answer 1

使用这个

public List<BaseTableOfContents> searchNodesForText(@Nullable String rootHash,
                                                            @Nullable String substring) {
        List<BaseTableOfContentsNode> returnValue = null;
        if (StringUtils.isNotEmpty(substring) && StringUtils.isNotEmpty(rootHash)) {
            String likeQuery = "%" + substring.indexOf(0) + "%";
            Cursor cursor = mDatabase.query(Tables.TOC_NODES, null,
                                            Columns.TOC_ROOT_NODE_HASH + " = ? AND (" +
                                            Columns.DISPLAY_TEXT + " LIKE ? OR " +
                                            Columns.TOC_IS_TITLE_BREAK + " = 1)",
                                            new String[] { rootHash, likeQuery }, null, null,
                                            Columns.TOC_SORT_ORDER + ORDER_ASCENDING);

            returnValue = getNodesFromCursor(cursor);
            cursor.close();
        }

substring.indexOf(0) take the first character of your text and show all data that start with that letter.

如何通过sqlite android中搜索词的首字母获取所有数据？

How to get all data through starting letter of the searched word in sqlite android?

java

android

sqlite

cursor

android-sqlite