MATLAB DATABASE TOOLBOX RELEASE NOTES Guía de usuario Pagina 604
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7 Functions — Alphabetical List
7-174
isnullcolumn
Determine if last record read in resultset is NULL
Syntax
a = isnullcolumn(rset)
Description
a = isnullcolumn(rset) returns 1 if the last record read in the resultset rset is
NULL. It returns 0 otherwise.
Examples
Example 1 — Result Is Not NULL
isnullcolumn returns not null.
1
Run:
curs = fetch(curs,1);
rset = resultset(curs);
isnullcolumn(rset)
ans =
0
2
Verify this result.
curs.Data
ans =
[1400]
Example 2 — Result Is NULL
isnullcolumn returns null.
- Database Toolbox™ 1
- User's Guide 1
- How to Contact MathWorks 2
- Revision History 3
- Contents 5
- Working with Data Sources 11
- Using Database Explorer 12
- Using Visual Query Builder 12
- Functions — Alphabetical List 16
- Before You Begin 17
- 1 Before You Begin 18
- Working with Databases 19
- ) standard SQL 21
- Data Type Support 22
- Data Type Support 23
- Data Retrieval Restrictions 24
- Getting Started with Database 27
- Connection Options 32
- Connection Options 33
- Initial Setup Requirements 35
- Defining Database Drivers 36
- Interface” 38
- Oracle ODBC for Windows 70
- Administrator 71
- Oracle JDBC for Windows 74
- Oracle JDBC for Windows 75
- MySQL ODBC for Windows 83
- MySQL ODBC for Windows 85
- MySQL JDBC for Windows 89
- MySQL JDBC for Windows 91
- PostgreSQL ODBC for Windows 95
- PostgreSQL ODBC for Windows 97
- See Also 101
- More About 101
- PostgreSQL JDBC for Windows 102
- PostgreSQL JDBC for Windows 103
- SQLite JDBC for Windows 108
- SQLite JDBC for Windows 109
- Sybase ODBC for Windows 115
- Sybase ODBC for Windows 117
- Sybase JDBC for Windows 123
- Sybase JDBC for Windows 125
- Oracle JDBC for Mac OS X 144
- Oracle JDBC for Mac OS X 145
- Oracle JDBC for Linux 151
- Oracle JDBC for Linux 153
- MySQL JDBC for Mac OS X 158
- MySQL JDBC for Mac OS X 159
- MySQL JDBC for Linux 165
- MySQL JDBC for Linux 167
- PostgreSQL JDBC for Mac OS X 172
- PostgreSQL JDBC for Mac OS X 173
- PostgreSQL JDBC for Linux 179
- PostgreSQL JDBC for Linux 181
- SQLite JDBC for Mac OS X 186
- SQLite JDBC for Mac OS X 187
- SQLite JDBC for Linux 193
- SQLite JDBC for Linux 195
- Sybase JDBC for Mac OS X 200
- Sybase JDBC for Mac OS X 201
- Sybase JDBC for Linux 207
- Sybase JDBC for Linux 209
- ODBC-Compliant Databases 214
- JDBC-Compliant Databases 214
- Related Examples 216
- Connecting to a Database 217
- PostgreSQL 218
- Selecting Data 221
- Working with Large Data Sets 224
- About Driver Configurations 226
- Setting Up ODBC Data Sources 230
- Setting Up JDBC Data Sources 231
- 3 Working with Data Sources 232
- Removing JDBC Data Sources 234
- Fetching Data Common Errors 235
- OracleDataSource.makeURL 240
- Compatibility and Limitations 249
- 4 Using Database Explorer 252
- Configure Your Environment 256
- Work with Multiple Databases 267
- ODBC Drivers 269
- JDBC Drivers 269
- Generate SQL and MATLAB Code 275
- 5 Using Visual Query Builder 280
- Using Queries to Export Data 287
- Working with Preferences 293
- Working with Preferences 295
- How Do I Perform Batching? 299
- Displaying Query Results 301
- Displaying Query Results 303
- Charting Query Results 305
- Saving Queries in Files 339
- Editing Queries 341
- Create a Query Using a Date 350
- Create a Query Using a String 352
- Delete Data from Databases 358
- Bulk Insert into Oracle 368
- Bulk Insert into MySQL 372
- Close the connection 373
- Retrieve Image Data Types 374
- Retrieve Image Data Types 375
- Display Database Metadata 376
- Using Driver Functions 379
- About the exec Function 382
- Using Cursor Objects 382
- Working with Microsoft Excel 383
- Database Considerations 383
- About the fetch Function 390
- Database Consideration 393
- About Scrollable Cursors 400
- About the fastinsert Function 410
- Database Connection Objects 412
- Cursor Objects 413
- Driver Objects 414
- Database Metadata Objects 414
- Drivermanager Objects 415
- Resultset Objects 415
- Resultset Metadata Objects 415
- About the setdbprefs Function 417
- Allowable Properties 417
- Read the first five records 424
- Description 432
- Examples 432
- Input Arguments 434
- Output Arguments 435
- Alternatives 459
- 'ftab') 461
- Close the cursor object 469
- Import Numeric Data 469
- Name-Value Pair Arguments 479
- database 483
- Properties 517
- Object Functions 518
- Create Object 518
- Database Explorer 524
- Database Explorer 527
- 3 to import data starting 576
- importedkeys 591
- Compatibility 622
- Limitations 623
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