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我以前试过这个说法：

public Cursor searchForSchools(String[] args) throws SQLException {
    String myQuery = "SELECT skola._id, skola.naziv, skola.privatna, skola.adresa, opstina.naziv, skola.broj_ucenika, skola.telefon, skola.web, oblast.naziv " +
                    "FROM skola JOIN opstina ON skola.id_opstina = opstina._id " +
                    "JOIN profil ON skola.id_tip = profil._id " +
                    "JOIN oblast_m ON profil._id = oblast_m.id_profil " +
                    "JOIN oblast ON oblast_m.id_oblast = oblast._id ";
    return database.rawQuery(myQuery + "WHERE skola.naziv LIKE \"%?%\" AND opstina.naziv = ? AND skola.broj_ucenika ? AND skola.oblasti LIKE \"%?%\" AND skola.privatna ?", args);

但这不起作用，因为 SQL 语法错误。

所以现在，我正在尝试用以下方法构建子句的第二部分：

public Cursor searchForSchools(String[] args) throws SQLException {
    String myQuery = "SELECT skola._id, skola.naziv, skola.privatna, skola.adresa, opstina.naziv, skola.broj_ucenika, skola.telefon, skola.web, oblast.naziv " +
                    "FROM skola JOIN opstina ON skola.id_opstina = opstina._id " +
                    "JOIN profil ON skola.id_tip = profil._id " +
                    "JOIN oblast_m ON profil._id = oblast_m.id_profil " +
                    "JOIN oblast ON oblast_m.id_oblast = oblast._id ";
    return database.rawQuery(myQuery + buildQueryString(args), null);
}

private String buildQueryString(String[] args) {
    String buildString="WHERE";
    if(args[0]!="*")
        buildString += " skola.naziv LIKE %\"" + args[0] + "\" AND";
    if(args[1]!="*")
        buildString += " opstina.naziv = \"" + args[1] + "\" AND";
    if(args[2]!="*")
        buildString += " skola.broj_ucenika " + args[2] + "\" AND";
    if(args[3]!="*")
        buildString += " oblast.naziv LIKE %\"" + args[3] + "\" AND";
    buildString += " skola.privatna " + args[4];
    return buildString;
}

问题是有时 args 数组包含 ' '（星号），这表明查询与该列不相关（即任何值都是可接受的）但是在第一种调用方法中会导致像“WHERE opstina”这样的子句.naziv = ' '" 返回错误...

所以让我解释一下我的目标 - 我想创建一个动态 SQL 语句，它可以处理返回所有数据的所有情况（当 args[]={' ',' ',' ',' ',' '} 时）最复杂的情​​况是每个 args 字符串的值都不同于“ ”。提前致谢...

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