sqlite_loadable::api

Function value_text

Source 
pub fn value_text<'a>(value: &*mut sqlite3_value) -> Result<&'a str, Utf8Error>
Expand description

Returns the sqlite3_value_text result from the given sqlite3_value, as a str. If the number of bytes of the underlying value is 0, then an empty string is returned. A UTF8 Error is returned if there are problems encoding the string.

Examples found in repository?
examples/scalar.rs (line 15)
14fn surround(context: *mut sqlite3_context, values: &[*mut sqlite3_value]) -> Result<()> {
15    let value = api::value_text(values.get(0).expect("1st argument as name"))?;
16    api::result_text(context, format!("x{}x", value))?;
17    Ok(())
18}
19
20// add_rs(a, b)
21fn add(context: *mut sqlite3_context, values: &[*mut sqlite3_value]) -> Result<()> {
22    let a = api::value_int(values.get(0).expect("1st argument"));
23    let b = api::value_int(values.get(1).expect("2nd argument"));
24    api::result_int(context, a + b);
25    Ok(())
26}
27
28// connect(seperator, string1, ...)
29fn connect(context: *mut sqlite3_context, values: &[*mut sqlite3_value]) -> Result<()> {
30    let seperator = api::value_text(values.get(0).expect("1st argument"))?;
31    let strings: Vec<&str> = values
32        .get(1..)
33        .expect("more than 1 argument to be given")
34        .iter()
35        .filter_map(|v| api::value_text(v).ok())
36        .collect();
37    api::result_text(context, strings.join(seperator))?;
38    Ok(())
39}
More examples
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examples/hello.rs (line 11)
10pub fn hello(context: *mut sqlite3_context, values: &[*mut sqlite3_value]) -> Result<()> {
11    let name = api::value_text(values.get(0).expect("1st argument as name"))?;
12
13    api::result_text(context, format!("hello, {}!", name))?;
14    Ok(())
15}
examples/characters.rs (line 107)
100    fn filter(
101        &mut self,
102        _idx_num: i32,
103        _idx_str: Option<&str>,
104        values: &[*mut sqlite3_value],
105    ) -> Result<()> {
106        let input =
107            api::value_text(values.get(0).expect("1st input constraint is required"))?.to_owned();
108        self.characters = Some(input.chars().collect());
109        self.input = Some(input);
110        self.idx = 0;
111        Ok(())
112    }