mirror of https://github.com/TakeV-Lambda/dino.git
90 lines
2.7 KiB
Vala
90 lines
2.7 KiB
Vala
using Sqlite;
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namespace Qlite {
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public class UpsertBuilder : StatementBuilder {
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// INTO [...]
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private Table table;
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private string table_name;
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// VALUES [...]
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private StatementBuilder.AbstractField[] keys = {};
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private StatementBuilder.AbstractField[] fields = {};
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internal UpsertBuilder(Database db, Table table) {
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base(db);
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this.table = table;
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this.table_name = table.name;
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}
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public UpsertBuilder value<T>(Column<T> column, T value, bool key = false) {
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if (key) {
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keys += new Field<T>(column, value);
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} else {
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fields += new Field<T>(column, value);
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}
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return this;
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}
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public UpsertBuilder value_null<T>(Column<T> column) {
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if (column.not_null) error("Can't set non-null column %s to null", column.name);
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fields += new NullField<T>(column);
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return this;
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}
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internal override Statement prepare() {
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error("prepare() not available for upsert.");
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}
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internal Statement prepare_upsert() {
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var unique_fields = new StringBuilder();
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var unique_values = new StringBuilder();
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var update_fields = new StringBuilder();
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var update_values = new StringBuilder();
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var update_fields_vals = new StringBuilder();
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for (int i = 0; i < keys.length; i++) {
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if (i != 0) {
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unique_fields.append(", ");
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unique_values.append(", ");
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}
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unique_fields.append(keys[i].column.name);
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unique_values.append("?");
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}
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for (int i = 0; i < fields.length; i++) {
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if (i != 0) {
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update_fields.append(", ");
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update_values.append(", ");
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update_fields_vals.append(", ");
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}
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update_fields.append(fields[i].column.name);
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update_values.append("?");
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update_fields_vals.append(fields[i].column.name).append("=excluded.").append(fields[i].column.name);
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}
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string sql = @"INSERT INTO $table_name ($(unique_fields.str), $(update_fields.str)) VALUES ($(unique_values.str), $(update_values.str)) " +
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@"ON CONFLICT ($(unique_fields.str)) DO UPDATE SET $(update_fields_vals.str)";
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Statement stmt = db.prepare(sql);
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for (int i = 0; i < keys.length; i++) {
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keys[i].bind(stmt, i + 1);
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}
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for (int i = 0; i < fields.length; i++) {
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fields[i].bind(stmt, i + keys.length + 1);
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}
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return stmt;
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}
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public int64 perform() {
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if (prepare_upsert().step() != DONE) {
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critical(@"SQLite error: %d - %s", db.errcode(), db.errmsg());
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}
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return db.last_insert_rowid();
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}
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}
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}
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