Webtabellen Converteren naar SQL INSERT-Statements
Je hebt een tabel op een webpagina. Je hebt het nodig in je database. De handmatige aanpak: kopiëren naar Excel, opschonen, CSV exporteren, handmatig CREATE TABLE schrijven, LOAD DATA of COPY gebruiken, fouten debuggen. De betere aanpak: genereer direct complete SQL—CREATE TABLE met afgeleide types, INSERT-statements met juiste escaping. Zo bouw je een webtabel-naar-SQL-converter. Het…
In order to convert web tables into SQL INSERT statements, one must first create a web table-to-SQL converter. This tool generates complete SQL exports, including CREATE TABLE statements with derived data types, as well as INSERT statements with proper escaping.
The process involves several key requirements: a valid table name (SQL-safe identifier), valid column names (no spaces or special characters), appropriate column types (INTEGER, REAL, or TEXT), correct escaped values (doubled single quotes), handling of NULL values, and proper sanitization of SQL identifiers.
The conversion begins with sanitizing SQL identifiers, which involves removing spaces, special characters, accents, and converting the identifier to lowercase. If the identifier begins with a number, an underscore is added to the front. If the sanitized identifier is empty, a fallback is used.
Next, unique column names are generated to ensure that tables cannot have duplicate column names. The function generateColumnNames takes a header row and maps each header to a sanitized identifier, ensuring uniqueness by appending a counter if necessary.
The final step in the process is inferring SQL column types. SQL supports three main types: INTEGER for whole numbers, REAL for decimal numbers, and TEXT for all other values. The function inferSqlColumnTypes examines the values in each column and selects the most specific type that fits all the values in that column. INTEGER is chosen for whole numbers, REAL for decimal numbers, and TEXT for all other values.
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