110 lines
3.3 KiB
Vala
110 lines
3.3 KiB
Vala
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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) throws DatabaseError {
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if (column.not_null) throw new DatabaseError.ILLEGAL_QUERY(@"Can't set non-null column $(column.name) to null");
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fields += new NullField<T>(column);
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return this;
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}
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internal override Statement prepare() throws DatabaseError {
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throw new DatabaseError.NOT_SUPPORTED("prepare() not available for upsert.");
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}
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internal Statement prepare_update() {
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string update_set_list = "";
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string update_where_list = "";
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for (int i = 0; i < fields.length; i++) {
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if (i != 0) {
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update_set_list += ", ";
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}
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update_set_list += @"$(((!)fields[i].column).name) = ?";
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}
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for (int i = 0; i < keys.length; i++) {
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if (i != 0) {
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update_where_list += " AND ";
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}
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update_where_list += @"$(((!)keys[i].column).name) = ?";
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}
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string sql = @"UPDATE $table_name SET $update_set_list WHERE $update_where_list";
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Statement stmt = db.prepare(sql);
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for (int i = 0; i < fields.length; i++) {
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fields[i].bind(stmt, i + 1);
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}
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for (int i = 0; i < keys.length; i++) {
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keys[i].bind(stmt, i + fields.length + 1);
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}
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return stmt;
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}
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internal Statement prepare_insert() {
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string insert_field_list = "";
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string insert_value_qs = "";
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for (int i = 0; i < fields.length; i++) {
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if (i != 0) {
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insert_value_qs += ", ";
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insert_field_list += ", ";
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}
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insert_field_list += ((!)fields[i].column).name;
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insert_value_qs += "?";
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}
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for (int i = 0; i < keys.length; i++) {
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if (i != 0 || fields.length > 0) {
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insert_value_qs += ", ";
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insert_field_list += ", ";
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}
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insert_field_list += ((!)keys[i].column).name;
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insert_value_qs += "?";
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}
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string sql = @"INSERT OR IGNORE INTO $table_name ($insert_field_list) VALUES ($insert_value_qs)";
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Statement stmt = db.prepare(sql);
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for (int i = 0; i < fields.length; i++) {
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fields[i].bind(stmt, i + 1);
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}
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for (int i = 0; i < keys.length; i++) {
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keys[i].bind(stmt, i + fields.length + 1);
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}
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return stmt;
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}
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public int64 perform() throws DatabaseError {
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if (prepare_update().step() != DONE || prepare_insert().step() != DONE) {
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throw new DatabaseError.EXEC_ERROR(@"SQLite error: $(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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