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use crate::*;
pub trait IndexBuilder: QuotedBuilder {
fn prepare_table_index_expression(&self, create: &IndexCreateStatement, sql: &mut SqlWriter) {
self.prepare_index_prefix(create, sql);
write!(sql, "KEY ").unwrap();
self.prepare_index_name(&create.index.name, sql);
self.prepare_index_type(&create.index_type, sql);
self.prepare_index_columns(&create.index.columns, sql);
}
fn prepare_index_create_statement(&self, create: &IndexCreateStatement, sql: &mut SqlWriter) {
write!(sql, "CREATE ").unwrap();
self.prepare_index_prefix(create, sql);
write!(sql, "INDEX ").unwrap();
self.prepare_index_name(&create.index.name, sql);
write!(sql, " ON ").unwrap();
if let Some(table) = &create.table {
table.prepare(sql, self.quote());
}
self.prepare_index_type(&create.index_type, sql);
self.prepare_index_columns(&create.index.columns, sql);
}
fn prepare_index_drop_statement(&self, drop: &IndexDropStatement, sql: &mut SqlWriter);
#[doc(hidden)]
fn prepare_index_type(&self, _col_index_type: &Option<IndexType>, _sql: &mut SqlWriter) {}
#[doc(hidden)]
fn prepare_index_prefix(&self, create: &IndexCreateStatement, sql: &mut SqlWriter);
#[doc(hidden)]
fn write_column_index_prefix(&self, col_prefix: &Option<u32>, sql: &mut SqlWriter) {
if let Some(prefix) = col_prefix {
write!(sql, " ({})", prefix).unwrap();
}
}
#[doc(hidden)]
fn prepare_index_columns(&self, columns: &[IndexColumn], sql: &mut SqlWriter) {
write!(sql, " (").unwrap();
columns.iter().fold(true, |first, col| {
if !first {
write!(sql, ", ").unwrap();
}
col.name.prepare(sql, self.quote());
self.write_column_index_prefix(&col.prefix, sql);
if let Some(order) = &col.order {
match order {
IndexOrder::Asc => write!(sql, " ASC").unwrap(),
IndexOrder::Desc => write!(sql, " DESC").unwrap(),
}
}
false
});
write!(sql, ")").unwrap();
}
#[doc(hidden)]
fn prepare_index_name(&self, name: &Option<String>, sql: &mut SqlWriter) {
if let Some(name) = name {
write!(sql, "{}{}{}", self.quote(), name, self.quote()).unwrap();
}
}
}