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optimize sqlite call

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This commit is contained in:
vms 2019-08-18 18:16:22 +02:00
parent 167fc19b6a
commit b2fdcd889e
2 changed files with 22 additions and 32 deletions
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29
backend-rust/step2-database-only/src/database.rs
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@ -1,24 +1,19 @@
use crate::errors::{err_msg, AppResult}; use crate::errors::{err_msg, AppResult};
use crate::sqlite; use crate::sqlite;
pub fn query(query: &str) -> AppResult<String> { pub fn query(bytes: &str) -> AppResult<String> {
let response = sqlite::call(query.as_bytes()); let response = sqlite::call(bytes.as_bytes());
// Decode query result to a utf8 string // Decode query result to a utf8 string
let result_str = std::str::from_utf8(&response); match String::from_utf8(response) {
Ok(string) => Ok(string),
// Log if there's an error Err(err) => {
if result_str.is_err() { log::error!("unable to decode result from bytes: {:#x?}", bytes);
log::error!("unable to decode result from bytes: {:#x?}", response); Err(err_msg(&format!(
}
// Wrap error with a better message, and return Result
result_str
.map_err(|e| {
err_msg(&format!(
"unable to decode result from bytes {:#x?}: {}", "unable to decode result from bytes {:#x?}: {}",
response, e bytes, err
)) )))
}) }
.map(|s| s.to_string()) }
} }

29
backend-rust/step3-finished-app/src/database.rs
View File

@ -1,24 +1,19 @@
use crate::errors::{err_msg, AppResult}; use crate::errors::{err_msg, AppResult};
use crate::sqlite; use crate::sqlite;
pub fn query(query: &str) -> AppResult<String> { pub fn query(bytes: &str) -> AppResult<String> {
let response = sqlite::call(query.as_bytes()); let response = sqlite::call(bytes.as_bytes());
// Decode query result to a utf8 string // Decode query result to a utf8 string
let result_str = std::str::from_utf8(&response); match String::from_utf8(response) {
Ok(string) => Ok(string),
// Log if there's an error Err(err) => {
if result_str.is_err() { log::error!("unable to decode result from bytes: {:#x?}", bytes);
log::error!("unable to decode result from bytes: {:#x?}", response); Err(err_msg(&format!(
}
// Wrap error with a better message, and return Result
result_str
.map_err(|e| {
err_msg(&format!(
"unable to decode result from bytes {:#x?}: {}", "unable to decode result from bytes {:#x?}: {}",
response, e bytes, err
)) )))
}) }
.map(|s| s.to_string()) }
} }