Question

如何在SQLite数据库中提高性能插入数据。

数据量为30000条记录。守则是：

- (void)insertBranchDB:branchlistArray
{
const char *dbpath = [databasePath UTF8String];

if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
    int count = 0;
    for (Branch *branch in branchlistArray) {
        NSString *insertSQL = [NSString stringWithFormat:
                               @"insert or replace into Branch (id, lang, lat, lng, province_id, district_id, optional, bus, status, name, address, contact, telephone, remark, province_name, district_name, lastupdate) values (\"%@\", \"%@\", \"%@\", \"%@\",\"%@\", \"%@\", \"%@\", \"%@\",\"%@\", \"%@\", \"%@\", \"%@\",\"%@\", \"%@\", \"%@\", \"%@\", \"%@\")",branch._id,branch.lang,branch.lat,branch.lng,branch.province_id,branch.district_id,branch.optional,branch.bus,branch.status,branch.name,branch.address,branch.contact,branch.telephone,branch.remark,branch.province_name,branch.district_name,branch.lastupdate];
        const char *insert_stmt = [insertSQL UTF8String];
        sqlite3_prepare_v2(database, insert_stmt,-1, &statement, NULL);
        if (sqlite3_step(statement) == SQLITE_DONE) {
            NSLog(@"Completed to Add Branch %d",count);
            count;
        }
        else {
            NSLog(@"Failed to Add Branch %d",count);
            count;
        }
    }
    sqlite3_finalize(statement);
    sqlite3_close(database);
    }
}

Answer 1

如果您使用交易，您会看到显着的性能提升。因此，在执行所有INSERT语句之前，请执行BEGIN TRANSACTION，最后执行COMMIT（或COMMIT TRANSACTION或END TRANSACTION）。

请参阅Transactions上的http://sqlite.org讨论。

Answer 2

查看批量插入行

INSERT INTO 'tablename'
SELECT 'data1' AS 'column1', 'data2' AS 'column2'
UNION ALL SELECT 'data1', 'data2'
UNION ALL SELECT 'data1', 'data2'
UNION ALL SELECT 'data1', 'data2'

所以在你的情况下：

INSERT INTO 'Branch'
SELECT 'id' AS 'column1', 'lang' AS 'column2'
UNION ALL SELECT 'row_one_.branch._id', 'row_one_.branch.lang'
UNION ALL SELECT 'row_two_.branch._id', 'row_two_.branch.lang'
UNION ALL SELECT 'row_three_.branch._id', 'row_three_.branch.lang'

查看此帖子Is it possible to insert multiple rows at a time in an SQLite database?

iOS - 提高插入性能SQLite

2 个答案: