1. Download FileToDB from here.
2. Check “UseUnicode” box on Oracle logon window.
3. Create your field as “NCLOB”, not “CLOB”.
EXCEL → Oracle reference
Type mapping
| Value kind | in EXCEL | in Oracle |
|---|---|---|
| Int | 1234 (a real numeric cell) | NUMBER(10) |
| Bigint | 9007199254740993 (exact only while the cell stays text) | NUMBER(19) |
| Decimal | 1234.56 (numeric cell, format controls the displayed decimals) | NUMBER(p,s) |
| Float | 1.234E+10 (numeric cell) | BINARY_DOUBLE |
| Text | text cell; leading zeros survive only if the column is text | VARCHAR2(n) |
| Long text | text cell; wraps inside the cell rather than the row | CLOB |
| Date | a serial number plus a date cell format | DATE |
| Datetime | a serial number plus a date-time cell format | TIMESTAMP |
| Binary | not representable as data | BLOB |
| Boolean | TRUE / FALSE (a real boolean cell) | NUMBER(1) |
| JSON | a text cell; the quotes are part of the value | CLOB |
Dialect differences
EXCEL is a file format and Oracle is a database server, so the target has to be told the types the file never carried – the rows below are where the two sides diverge.
| Property | in EXCEL | in Oracle |
|---|---|---|
| port | — | 1521 |
| identifiers | Not applicable; a cell holds exactly one value | "double quotes" |
| row limit | — | FETCH FIRST n ROWS ONLY |
| dates | Stored as a serial number; only the cell format makes it lo... | DATE, TIMESTAMP |
| long text | — | CLOB, NCLOB |
| binary | Only as text or an embedded object, not as a data column | BLOB, BFILE |
| separator | Cells, not delimiters | — |
| encoding | UTF-8 internally, declared in the package | — |
| typing | Real cell types: text, number, date, boolean, error | — |
| shape | Multiple sheets, each a flat grid | Tables of rows and columns |
| ceiling | 1,048,576 rows x 16,384 columns per sheet; 255 sheets per w... | — |
Command line
| Side | Command |
|---|---|
| Oracle | exp / expdp |
| Oracle (load) | sqlldr (SQL*Loader) |
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