move extra_float_digits parameter to PgConnectOptions

sqlx-core/src/postgres/connection/establish.rs

@@ -32,8 +32,7 @@ impl PgConnection {
             // Sets the time zone for displaying and interpreting time stamps.
             ("TimeZone", "UTC"),
             // Adjust postgres to return precise values for floats
-            // NOTE: This is default in postgres 12+
-            ("extra_float_digits", "3"),
+            ("extra_float_digits", options.extra_float_digits.as_str()),
         ];
 
         if let Some(ref application_name) = options.application_name {

sqlx-core/src/postgres/options/mod.rs

@@ -88,6 +88,7 @@ pub struct PgConnectOptions {
     pub(crate) application_name: Option<String>,
     pub(crate) log_settings: LogSettings,
     pub(crate) options: Option<String>,
+    pub(crate) extra_float_digits: String,
 }
 
 impl Default for PgConnectOptions {
@@ -149,6 +150,8 @@ impl PgConnectOptions {
             application_name: var("PGAPPNAME").ok(),
             log_settings: Default::default(),
             options: var("PGOPTIONS").ok(),
+            // NOTE: This is default in postgres 12+
+            extra_float_digits: "3".to_owned(),
         }
     }
 
@@ -378,6 +381,20 @@ impl PgConnectOptions {
             _ => None,
         }
     }
+
+    /// Sets the extra float digits. Defaults to 3
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use sqlx_core::postgres::PgConnectOptions;
+    /// let options = PgConnectOptions::new()
+    ///     .extra_float_digits("2");
+    /// ```
+    pub fn extra_float_digits(mut self, extra_float_digits: &str) -> Self {
+        self.extra_float_digits = extra_float_digits.to_owned();
+        self
+    }
 }
 
 fn default_host(port: u16) -> String {