EDI API

Extensions

Edi	Database structure.
EdiField	EDI Record field structure.
EdiGrid	Grid structure.
EdiRec	Database record structure.
EdiService	Edi service control structure.

Functions

int	edRemoveColumn(Edi edi, cchar tableName, cchar *columnName)
	Remove a column from a table.
int	ediAddColumn(Edi edi, cchar tableName, cchar *columnName, int type, int flags)
	Add a column to a table.
void	ediAddFieldError(struct EdiRec rec, cchar field, cchar *fmt, ...)
	Add a field error message.
int	ediAddIndex(Edi edi, cchar tableName, cchar columnName, cchar indexName)
	Add an index to a table.
void	ediAddProvider(struct EdiProvider *provider)
	Add a database provider.
int	ediAddTable(Edi edi, cchar tableName)
	Add a table to a database.
int	ediAddValidation(Edi edi, cchar name, cchar tableName, cchar columnName, cvoid *data)
	Add a validation.
int	ediChangeColumn(Edi edi, cchar tableName, cchar *columnName, int type, int flags)
	Change a column schema definition.
Edi *	ediClone(Edi *edi)
	Clone a database.
EdiGrid *	ediCloneGrid(EdiGrid *grid)
	Clone a grid.
void	ediClose(Edi *edi)
	Close a database.
EdiGrid *	ediCreateBareGrid(Edi edi, cchar tableName, int nrows)
	Create a bare grid.
EdiRec *	ediCreateBareRec(Edi edi, cchar tableName, int nfields)
	Create a bare, free-standing record.
EdiRec *	ediCreateRec(Edi edi, cchar tableName)
	Create a new record based on the table's schema.
EdiService *	ediCreateService(void)
	Create the EDI service.
void	ediDefineMigration(struct Edi *edi, EdiMigration forw, EdiMigration back)
	Define database migration callbacks.
void	ediDefineValidation(cchar *name, EdiValidationProc vfn)
	Define a field validation procedure.
int	ediDelete(Edi edi, cchar path)
	Delete the database at the given path.
void	ediDumpGrid(cchar message, EdiGrid grid)
	Display the grid to the debug log.
void	ediDumpRec(cchar message, EdiRec rec)
	Display a record to the debug log.
EdiGrid *	ediFilterGridFields(EdiGrid grid, cchar fields, int include)
	Filter the fields of a grid.
EdiRec *	ediFilterRecFields(EdiRec rec, cchar fields, int include)
	Filter the fields of a record.
EdiGrid *	ediFindGrid(Edi edi, cchar tableName, cchar *query)
	Read matching records in a table.
EdiRec *	ediFindRec(Edi edi, cchar tableName, cchar *query)
	Read one record.
cchar *	ediFormatField(cchar fmt, EdiField fp)
	Format a field value.
int	ediGetColumnSchema(Edi edi, cchar tableName, cchar columnName, int type, int flags, int cid)
	Get the column schema.
MprList *	ediGetColumns(Edi edi, cchar tableName)
	Get a list of database column names.
EdiField *	ediGetField(EdiRec rec, cchar fieldName)
	Get a record field.
int	ediGetFieldType(EdiRec rec, cchar fieldName)
	Get the data type of a record field.
cchar *	ediGetFieldValue(EdiRec rec, cchar fieldName)
	Get a field value.
MprList *	ediGetGridColumns(EdiGrid *grid)
	Get a list of grid column names.
cchar *	ediGetGridSchemaAsJson(EdiGrid *grid)
	Get the schema for a grid and format as JSON.
EdiField *	ediGetNextField(EdiRec rec, EdiField fp, int offset)
	Get the next field in a record This is used as an iterator.
EdiRec *	ediGetNextRec(EdiGrid grid, EdiRec rec)
	Get the next record in a grid This is used as an iterator.
MprHash *	ediGetRecErrors(EdiRec *rec)
	Get record validation errors.
cchar *	ediGetRecSchemaAsJson(EdiRec *rec)
	Get the schema for a record and format as JSON.
int	ediGetTableDimensions(Edi edi, cchar tableName, int numRows, int numCols)
	Get table dimensions information.
cchar *	ediGetTableSchemaAsJson(Edi edi, cchar tableName)
	Get a table schema and format as JSON.
MprList *	ediGetTables(Edi *edi)
	Get a list of database tables.
char *	ediGetTypeString(int type)
	Convert an EDI type to a string.
cchar *	ediGridAsJson(EdiGrid *grid, int flags)
	Convert an EDI database grid into a JSON string.
EdiGrid *	ediJoin(Edi *edi, ...)
	Join grids.
int	ediLoad(Edi edi, cchar path)
	Load the database file.
int	ediLookupField(Edi edi, cchar tableName, cchar *fieldName)
	Lookup a column field by name.
EdiProvider *	ediLookupProvider(cchar *providerName)
	Lookup an EDI provider name.
EdiGrid *	ediMakeGrid(cchar *content)
MprJson *	ediMakeJson(cchar *fmt, ...)
	Make a JSON container of property values.
EdiRec *	ediMakeRec(cchar *content)
	Make a record.
EdiRec *	ediMakeRecFromJson(cchar tableName, MprJson fields)
	Make a record from a JSON fields object.
void	ediManageEdiRec(EdiRec *rec, int flags)
	Manage an EdiRec instance for garbage collection.
Edi *	ediOpen(cchar source, cchar provider, int flags)
	Open a database.
int	ediParseTypeString(cchar *type)
	Parse an EDI type string.
EdiGrid *	ediPivotGrid(EdiGrid *grid, int flags)
	Pivot a grid swapping rows for columns.
EdiGrid *	ediQuery(Edi edi, cchar cmd, int argc, cchar **argv, va_list vargs)
	Run a database query query.
EdiField	ediReadField(Edi edi, cchar tableName, cchar key, cchar fieldName)
	Read a field from the database.
cchar *	ediReadFieldValue(Edi edi, cchar fmt, cchar tableName, cchar key, cchar fieldName, cchar defaultValue)
	Read a formatted field from the database.
EdiRec *	ediReadRec(Edi edi, cchar tableName, cchar *key)
	Read a record.
cchar *	ediRecAsJson(EdiRec *rec, int flags)
	Convert an EDI database record into a JSON string.
int	ediRemoveIndex(Edi edi, cchar tableName, cchar *indexName)
	Remove a table index.
int	ediRemoveRec(Edi edi, cchar tableName, cchar *key)
	Delete a row in a database table identified by a key value.
int	ediRemoveTable(Edi edi, cchar tableName)
	Remove a table from the database.
int	ediRenameColumn(Edi edi, cchar tableName, cchar columnName, cchar newColumnName)
	Rename a column.
int	ediRenameTable(Edi edi, cchar tableName, cchar *newTableName)
	Rename a table.
int	ediSave(Edi *edi)
	Save in-memory database contents to disk.
EdiRec *	ediSetField(EdiRec rec, cchar fieldName, cchar *value)
	Set a record field without writing to the database.
EdiRec *	ediSetFieldFmt(EdiRec rec, cchar fieldName, cchar *fmt, ...)
	Set a record field using a format string.
EdiRec *	ediSetFields(EdiRec rec, MprJson data)
	Set record fields without writing to the database.
void	ediSetPrivate(Edi *edi, bool on)
	Create a private database for each client.
void	ediSetReadonly(Edi *edi, bool on)
	Control whether the database accepts updates.
int	ediUpdateField(Edi edi, cchar tableName, cchar key, cchar fieldName, cchar *value)
	Write a value to a database table field.
int	ediUpdateFieldFmt(Edi edi, cchar tableName, cchar key, cchar fieldName, cchar *fmt, ...)
	Write a formatted value to a database table field.
int	ediUpdateRec(Edi edi, EdiRec rec)
	Write a record to the database.
bool	ediValidateRec(EdiRec *rec)
	Validate a record.

Typedefs

EdiProvider	Database provider interface.
EdiValidation	Validation structure.
EdiValidationProc	Field validation callback procedure.

Defines

#define	EDI_AUTO_INC 0x1
	Field flag Automatic increments on new row.
#define	EDI_AUTO_SAVE 0x2
	Auto-save database if modified in memory.
#define	EDI_CREATE 0x1
	Create database if not present.
#define	EDI_FOREIGN 0x8
	Field flag Column is a foreign key.
#define	EDI_GRID_READ_ONLY 0x1
	Grid contains pure database records, must not be modified.
#define	EDI_INDEX 0x4
	Field flag Column is indexed.
#define	EDI_KEY 0x2
	Field flag Column is the ID key.
#define	EDI_LITERAL 0x8
	Literal schema in ediOpen source parameter.
#define	EDI_NO_SAVE 0x4
	Prevent saving to disk.
#define	EDI_NOT_NULL 0x10
	Field flag Column must not be null (not implemented).
#define	EDI_PRIVATE 0x20
	Create private clone of the database.
#define	EDI_READ_ONLY 0x20
	Field flag Field is read-only (not implemented).
#define	EDI_SUPPRESS_SAVE 0x10
	Temporarily suppress auto-save.
#define	EDI_TYPE_BINARY 1
	Arbitrary binary data.
#define	EDI_TYPE_BOOL 2
	Boolean true\|false value.
#define	EDI_TYPE_DATE 3
	Date type (stored as epoch).
#define	EDI_TYPE_FLOAT 4
	Floating point number.
#define	EDI_TYPE_INT 5
	Integer number.
#define	EDI_TYPE_MAX 8
	Max type + 1.
#define	EDI_TYPE_STRING 6
	String.
#define	EDI_TYPE_TEXT 7
	Multi-line text.

Edi

Database structure.

Description:: The Embedded Database Interface (EDI) defines an abstract interface atop various relational database providers. Providers are supplied for SQLite and for the ESP Memory Database (MDB).

Fields:

EdiMigration	back	Backward migration callback.
char *	errMsg	Last error message.
int	flags	Database flags.
EdiMigration	forw	Forward migration callback.
MprMutex *	mutex	Multithread lock.
cchar *	path	Database path.
struct EdiProvider *	provider	Database provider.
MprHash *	schemaCache	Cache of table schema in JSON.
MprHash *	validations	Validations.

int ediAddColumn (Edi *edi, cchar *tableName, cchar *columnName, int type, int flags)

Add a column to a table.

Parameters:

edi	Database handle.
tableName	Database table name.
columnName	Database column name.
type	Column data type. Set to one of EDI_TYPE_BINARY, EDI_TYPE_BOOL, EDI_TYPE_DATE EDI_TYPE_FLOAT, EDI_TYPE_INT, EDI_TYPE_STRING, EDI_TYPE_TEXT.
flags	Control column attributes. Set to a set of: EDI_AUTO_INC for auto incrementing columns, EDI_KEY if the column is the key column and/or EDI_INDEX to create an index on the column.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

int ediAddIndex (Edi *edi, cchar *tableName, cchar *columnName, cchar *indexName)

Add an index to a table.

Parameters:

edi	Database handle.
tableName	Database table name.
columnName	Database column name.
indexName	Ignored. Set to null.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

int ediAddTable (Edi *edi, cchar *tableName)

Add a table to a database.

Parameters:

edi	Database handle.
tableName	Database table name. Table names should be singular. Certain routines like ediJoin rely on being able to map foreign key fields of the form NameId by converting the Name to a database table.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

int ediAddValidation (Edi *edi, cchar *name, cchar *tableName, cchar *columnName, cvoid *data)

Add a validation.

Description:: Validations are run when calling ediUpdateRec. A validation is used to validate field data using builtin validators.

Parameters:

edi	Database handle.
name	Validation name. Select from: banned to validate field data against a regular express for banned content. boolean to validate field data as "true" or "false" date to validate field data as a date or time. format to validate field data against a regular expression supplied in the "data" argument integer to validate field data as an integral value number to validate field data as a number. It may be an integer or floating point number. present to validate field data as not null. unique to validate field data as being unique in the database table.
tableName	Database table name.
columnName	Database column name.
data	Argument data for the validator. For example: the "format" validator requires a regular expression.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

int ediChangeColumn (Edi *edi, cchar *tableName, cchar *columnName, int type, int flags)

Change a column schema definition.

Parameters:

edi	Database handle.
tableName	Database table name.
columnName	Database column name.
type	Column data type. Set to one of EDI_TYPE_BINARY, EDI_TYPE_BOOL, EDI_TYPE_DATE EDI_TYPE_FLOAT, EDI_TYPE_INT, EDI_TYPE_STRING, EDI_TYPE_TEXT.
flags	Control column attributes. Set to a set of: EDI_AUTO_INC for auto incrementing columns, EDI_KEY if the column is the key column and/or EDI_INDEX to create an index on the column.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

Edi * * ediClone (Edi *edi)

Clone a database.

Parameters:

edi	Database to clone.

Returns:: A copy of the database.

API Stability:: Internal.

EdiGrid * * ediCloneGrid (EdiGrid *grid)

Clone a grid.

Parameters:

grid

to clone.

Returns:: A complete copy of a grid.

API Stability:: Stable.

void ediClose (Edi *edi)

Close a database.

Parameters:

edi	Database handle.

API Stability:: Stable.

EdiGrid * * ediCreateBareGrid (Edi *edi, cchar *tableName, int nrows)

Create a bare grid.

Description:: This creates an empty grid based on the given table's schema.

Parameters:

edi	Database handle.
tableName	Database table name.
nrows	Number of rows to reserve in the grid.

Returns:: EdiGrid instance.

API Stability:: Stable.

EdiRec * * ediCreateBareRec (Edi *edi, cchar *tableName, int nfields)

Create a bare, free-standing record.

Description:: This creates an empty record based. The tableName and number of fields are defined in the record, but otherwise, the record's fields are uninitialized. This API is a low level API used internally by ESP and EDI.

Parameters:

edi	Database handle.
tableName	Database table name.
nfields	Number of fields to reserve in the record.

Returns:: EdiGrid instance.

API Stability:: Stable.

EdiRec * * ediCreateRec (Edi *edi, cchar *tableName)

Create a new record based on the table's schema.

Description:: This will create an empty record using the given database tableName to supply the record schema. It will not be saved to the database as the field values have not been assigned. Set field values using ediSetField and ediSetFields and then save to the database using ediUpdateRec. Create a record based on the table's schema. Not saved to the database. Use ediCreateBareRec to create a free-standing record without requiring a database. The record is allocated and room is reserved to store record values. No record field values are stored.

Parameters:

edi	Database handle.
tableName	Database table name.

Returns:: Record instance.

API Stability:: Stable.

int ediDelete (Edi *edi, cchar *path)

Delete the database at the given path.

Parameters:

edi	Database handle. This is required to identify the database provider. The database should be closed before deleting.
path	Database path name.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

void ediDumpGrid (cchar *message, EdiGrid *grid)

Display the grid to the debug log.

Description:: Used for debugging only.

Parameters:

message	Prefix message to output.
grid	EDI grid.

API Stability:: Stable.

void ediDumpRec (cchar *message, EdiRec *rec)

Display a record to the debug log.

Description:: Used for debugging only.

Parameters:

message	Prefix message to output.
rec	Record to log.

API Stability:: Stable.

EdiGrid * * ediFindGrid (Edi *edi, cchar *tableName, cchar *query)

Read matching records in a table.

Description:: This runs a SQL like query on the database and returns matching records in a grid. The query selects the rows that have matching fields.

Parameters:

edi	Database handle.
tableName	Database table name.
query	SQL like query expression. This arg is a printf style format string. When expanded, this will contain a SQL style query expression of the form: "Field Op Value AND field OP value ... LIMIT offset, limit". All fields may be matched by using the pseudo column name "*". Where OP is "==", "!=", "<", ">", "<=", ">=" or "><".

Returns:: A grid containing all matching records. Returns NULL if no matching records.

API Stability:: Stable.

EdiRec * * ediFindRec (Edi *edi, cchar *tableName, cchar *query)

Read one record.

Description:: This runs a simple query on the database and selects the first matching record. The query selects a row that has a "field" that matches the given "value".

Parameters:

edi	Database handle.
tableName	Database table name.
query	SQL like query expression. This arg is a printf style format string. When expanded, this will contain a SQL style query expression of the form: "Field Op Value AND field OP value ... LIMIT offset, limit". All fields may be matched by using the pseudo column name "*". Where OP is "==", "!=", "<", ">", "<=", ">=" or "><".

Returns:: First matching record. Returns NULL if no matching records.

API Stability:: Deprecated.

cchar * * ediFormatField (cchar *fmt, EdiField *fp)

Format a field value.

Parameters:

fmt	Printf style format string.
fp	Field whoes value will be formatted.

Returns:: Formatted value string.

API Stability:: Stable.

MprList * * ediGetColumns (Edi *edi, cchar *tableName)

Get a list of database column names.

Parameters:

edi	Database handle.
tableName	Database table name.

Returns:: An MprList of column names in the given table.

API Stability:: Stable.

int ediGetColumnSchema (Edi *edi, cchar *tableName, cchar *columnName, int *type, int *flags, int *cid)

Get the column schema.

Parameters:

edi	Database handle.
tableName	Database table name.
columnName	Database column name.
type	Output parameter to receive the column data type. Will be set to one of: EDI_TYPE_BINARY, EDI_TYPE_BOOL, EDI_TYPE_DATE, EDI_TYPE_FLOAT, EDI_TYPE_INT, EDI_TYPE_STRING, EDI_TYPE_TEXT. Set to null if this data is not required.
flags	Output parameter to receive the column control flags. Will be set to one or more of: EDI_AUTO_INC, EDI_KEY and/or EDI_INDEX Set to null if this data is not required.
cid	Output parameter to receive the ordinal column index in the database table. Set to null if this data is not required.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

EdiField * * ediGetField (EdiRec *rec, cchar *fieldName)

Get a record field.

Parameters:

rec	Database record.
fieldName	Field in the record to extract.

Returns:: An EdiField structure containing the record field value and details.

API Stability:: Stable.

int ediGetFieldType (EdiRec *rec, cchar *fieldName)

Get the data type of a record field.

Parameters:

rec	Record to examine.
fieldName	Field to examine.

Returns:: The field type. Returns one of: EDI_TYPE_BINARY, EDI_TYPE_BOOL, EDI_TYPE_DATE, EDI_TYPE_FLOAT, EDI_TYPE_INT, EDI_TYPE_STRING, EDI_TYPE_TEXT.

API Stability:: Stable.

cchar * * ediGetFieldValue (EdiRec *rec, cchar *fieldName)

Get a field value.

Parameters:

rec	Database record.
fieldName	Field in the record to extract.

Returns:: A field value as a string.

API Stability:: Stable.

MprList * * ediGetGridColumns (EdiGrid *grid)

Get a list of grid column names.

Parameters:

grid	Database grid.

Returns:: An MprList of column names in the given grid.

API Stability:: Stable.

MprHash * * ediGetRecErrors (EdiRec *rec)

Get record validation errors.

Parameters:

rec	Database record.

Returns:: A hash of validation errors. If validation passed, then this call returns NULL.

API Stability:: Stable.

int ediGetTableDimensions (Edi *edi, cchar *tableName, int *numRows, int *numCols)

Get table dimensions information.

Parameters:

edi	Database handle.
tableName	Database table name.
numRows	Output parameter to receive the number of rows in the table Set to null if this data is not required.
numCols	Output parameter to receive the number of columns in the table Set to null if this data is not required.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

MprList * * ediGetTables (Edi *edi)

Get a list of database tables.

Parameters:

edi	Database handle.

Returns:: An MprList of table names in the database.

API Stability:: Stable.

cchar * * ediGetTableSchemaAsJson (Edi *edi, cchar *tableName)

Get a table schema and format as JSON.

Parameters:

edi	Database handle.
tableName	Name of table to examine.

API Stability:: Stable.

char * * ediGetTypeString (int type)

Convert an EDI type to a string.

Parameters:

type	Column data type. Set to one of EDI_TYPE_BINARY, EDI_TYPE_BOOL, EDI_TYPE_DATE EDI_TYPE_FLOAT, EDI_TYPE_INT, EDI_TYPE_STRING, EDI_TYPE_TEXT.

Returns:: Type string. This will be set to one of: "binary", "bool", "date", "float", "int", "string" or "text".

API Stability:: Stable.

cchar * * ediGridAsJson (EdiGrid *grid, int flags)

Convert an EDI database grid into a JSON string.

Parameters:

grid	EDI grid.
flags	Reserved. Set to MPR_JSON_PRETTY for a prettier format.

Returns:: JSON string.

API Stability:: Stable.

EdiGrid * * ediJoin (Edi *edi, ...)

Join grids.

Parameters:

edi	Database handle.
...	Null terminated list of data grids. These are instances of EdiGrid.

Returns:: A joined grid.

API Stability:: Stable.

int ediLoad (Edi *edi, cchar *path)

Load the database file.

Parameters:

edi	Database handle.
path	Database path name.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

int ediLookupField (Edi *edi, cchar *tableName, cchar *fieldName)

Lookup a column field by name.

Parameters:

edi	Database handle.
tableName	Database table name.
fieldName	Database column field name.

Returns:: The ordinal column index in the table if the column field is found. Otherwise returns a negative MPR error code.

API Stability:: Stable.

EdiProvider * * ediLookupProvider (cchar *providerName)

Lookup an EDI provider name.

Parameters:

providerName

Name of the EDI provider.

Returns:: The EDI provider object. Returns null if the provider cannot be found.

API Stability:: Stable.

EdiGrid * * ediMakeGrid (cchar *content)

Make a grid. \par \b Description: This call makes a free-standing data grid based on the JSON format content string. @param content JSON format content string. The content should be an array of objects where each object is a set of property names and values. @return An EdiGrid instance \par \b Example: : grid = ediMakeGrid("[ \\ \n { id: '1', country: 'Australia' }, \ \n { id: '2', country: 'China' }, \ \n ]");

API Stability:: Stable.

MprJson * * ediMakeJson (cchar *fmt, ...)

Make a JSON container of property values.

Description:: This routine formats the given arguments, parses the result into a JSON object.

Parameters:

fmt	Printf style format string.
...	arguments.

Returns:: MprJson instance.

API Stability:: Stable.

EdiRec * * ediMakeRec (cchar *content)

Make a record.

Description:: This call makes a free-standing data record based on the JSON format content string.

Parameters:

content

JSON format content string. The content should be a set of property names and values.

Returns:: An EdiRec instance.

Example:: : rec = ediMakeRec("{ id: 1, title: 'Message One', body: 'Line one' }");.

API Stability:: Stable.

EdiRec * * ediMakeRecFromJson (cchar *tableName, MprJson *fields)

Make a record from a JSON fields object.

Description:: This call makes a free-standing data record based on the JSON fields.

Parameters:

tableName	Name of the database table to initialize in the record.
fields	JSON object.

Returns:: An EdiRec instance.

API Stability:: Stable.

See Also:: ediMakeGrid, ediMakeRec

void ediManageEdiRec (EdiRec *rec, int flags)

Manage an EdiRec instance for garbage collection.

Parameters:

rec	Record instance.
flags	GC management flag.

API Stability:: Stable.

Edi * * ediOpen (cchar *source, cchar *provider, int flags)

Open a database.

Description:: This opens a database using the specified database provider.

Parameters:

source	Database path name. If using the "mdb" provider with the EDI_LITERAL flag, then the source argument can be set to a literal JSON database content string.
provider	Database provider. Set to "mdb" for the Memory Database or "sqlite" for the SQLite provider.
flags	Set to: EDI_CREATE Create database if not present. EDI_AUTO_SAVE Auto-save database if modified in memory. This option is only supported by the "mdb" provider. EDI_NO_SAVE Prevent saving to disk. This option is only supported by the "mdb" provider. EDI_LITERAL Literal schema in ediOpen source parameter. This option is only supported by the "mdb" provider.

Returns:: If successful, returns an EDI database instance object. Otherwise returns zero.

API Stability:: Stable.

int ediParseTypeString (cchar *type)

Parse an EDI type string.

Parameters:

type	Type string set to one of: "binary", "bool", "date", "float", "int", "string" or "text".

Returns:: Type code. Set to one of EDI_TYPE_BINARY, EDI_TYPE_BOOL, EDI_TYPE_DATE, EDI_TYPE_FLOAT, EDI_TYPE_INT, EDI_TYPE_STRING, EDI_TYPE_TEXT.

API Stability:: Stable.

EdiGrid * * ediQuery (Edi *edi, cchar *cmd, int argc, cchar **argv, va_list vargs)

Run a database query query.

Description:: This runs a provider dependant query. For the SDB SQLite provider, this runs an SQL statement. The "mdb" provider does not implement this API. To do queries using the "mdb" provider, use: ediFindRec, ediFindGrid and ediReadField. The query may contain positional parameters via argc/argv or via a va_list. These are recommended to mitigate SQL injection risk.

Parameters:

edi	Database handle.
cmd	Query command to execute.
argc	Number of query parameters in argv.
argv	Query parameter arguments.
vargs	Query parameters supplied in a NULL terminated va_list.

Returns:: If succesful, returns tabular data in the form of an EgiGrid structure. Returns NULL on errors.

API Stability:: Stable.

EdiField ediReadField (Edi *edi, cchar *tableName, cchar *key, cchar *fieldName)

Read a field from the database.

Description:: This reads a field from the database.

Parameters:

edi	Database handle.
tableName	Database table name.
key	Row key column value to read.
fieldName	Column name to read.

Returns:: Field value or null if the no record is found. May return null or empty if the field is null or empty.

API Stability:: Stable.

cchar * * ediReadFieldValue (Edi *edi, cchar *fmt, cchar *tableName, cchar *key, cchar *fieldName, cchar *defaultValue)

Read a formatted field from the database.

Description:: This reads a field from the database and formats the result using an optional format string. If the field has a null or empty value, the supplied defaultValue will be returned.

Parameters:

edi	Database handle.
fmt	Reserved and not yet implemented. Set to NULL.
tableName	Database table name.
key	Row key column value to read.
fieldName	Column name to read.
defaultValue	Default value to return if the field is null or empty.

Returns:: Field value or default value if field is null or empty. Returns null if no matching record is found.

API Stability:: Stable.

EdiRec * * ediReadRec (Edi *edi, cchar *tableName, cchar *key)

Read a record.

Description:: Read a record from the given table as identified by the key value.

Parameters:

edi	Database handle.
tableName	Database table name.
key	Key value of the record to read.

Returns:: Record instance of EdiRec.

API Stability:: Stable.

cchar * * ediRecAsJson (EdiRec *rec, int flags)

Convert an EDI database record into a JSON string.

Parameters:

rec	EDI record.
flags	Reserved. Set to zero.

Returns:: JSON string.

API Stability:: Stable.

int ediRemoveIndex (Edi *edi, cchar *tableName, cchar *indexName)

Remove a table index.

Parameters:

edi	Database handle.
tableName	Database table name.
indexName	Ignored. Set to null. This call will remove the table index.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

int ediRemoveRec (Edi *edi, cchar *tableName, cchar *key)

Delete a row in a database table identified by a key value.

Parameters:

edi	Database handle.
tableName	Database table name.
key	Key column value to delete.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

int ediRemoveTable (Edi *edi, cchar *tableName)

Remove a table from the database.

Parameters:

edi	Database handle.
tableName	Database table name.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

int ediRenameColumn (Edi *edi, cchar *tableName, cchar *columnName, cchar *newColumnName)

Rename a column.

Parameters:

edi	Database handle.
tableName	Database table name.
columnName	Database column name.
newColumnName	New column name.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

int ediRenameTable (Edi *edi, cchar *tableName, cchar *newTableName)

Rename a table.

Parameters:

edi	Database handle.
tableName	Database table name.
newTableName	New database table name.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

int ediSave (Edi *edi)

Save in-memory database contents to disk.

Description:: How this call behaves is provider dependant. If the provider is "mdb" and the database is not opened with AutoSave, then this call will save the in-memory contents. If the "mdb" database is opened with AutoSave, then this call will do nothing. For the "sdb" SQLite provider, this call does nothing.

Parameters:

edi	Database handle.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

EdiRec * * ediSetField (EdiRec *rec, cchar *fieldName, cchar *value)

Set a record field without writing to the database.

Description:: This routine updates the record object with the given value. The record will not be written to the database. To write to the database, use ediUpdateRec

Parameters:

rec	Record to update.
fieldName	Record field name to update.
value	Value to update.

Returns:: The record instance if successful, otherwise NULL.

API Stability:: Stable.

EdiRec * * ediSetFieldFmt (EdiRec *rec, cchar *fieldName, cchar *fmt, ...)

Set a record field using a format string.

Description:: This routine updates the record object with the given value. The record will not be written to the database. To write to the database, use ediUpdateRec

Parameters:

rec	Record to update.
fieldName	Record field name to update.
fmt	Format string.
...	Variable arguments for the format string.

Returns:: The record instance if successful, otherwise NULL.

API Stability:: Stable.

EdiRec * * ediSetFields (EdiRec *rec, MprJson *data)

Set record fields without writing to the database.

Description:: This routine updates the record object with the given values. The "data' argument supplies the fieldNames and values. The data may come from the request params() or it can be manually created via #ediMakeJson. For example: ediSetFields(rec, mprParseJson("{ name: 's', address: 's' }", name, address)) The record will not be written to the database. To write to the database, use ediUpdateRec

Parameters:

rec	Record to update.
data	Json object of field to use for the update.

Returns:: The record instance if successful, otherwise NULL.

API Stability:: Stable.

void ediSetPrivate (Edi *edi, bool on)

Create a private database for each client.

Parameters:

edi	Database handle.
on	Set to true to clone the database for each connected client.

API Stability:: Internal.

void ediSetReadonly (Edi *edi, bool on)

Control whether the database accepts updates.

Parameters:

edi	Database handle.
on	Set to true to make the database readonly, i.e. to disable all updates.

API Stability:: Stable.

int ediUpdateField (Edi *edi, cchar *tableName, cchar *key, cchar *fieldName, cchar *value)

Write a value to a database table field.

Description:: Update the value of a table field in the selected table row.

Parameters:

edi	Database handle.
tableName	Database table name.
key	Key value for the table row to update.
fieldName	Column name to update.
value	Value to write to the database field.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

int ediUpdateFieldFmt (Edi *edi, cchar *tableName, cchar *key, cchar *fieldName, cchar *fmt, ...)

Write a formatted value to a database table field.

Description:: Update the value of a table field in the selected table row. Note: field validations are not run.

Parameters:

edi	Database handle.
tableName	Database table name.
key	Key value for the table row to update.
fieldName	Column name to update.
fmt	Value format string.
...	Variable arguments for the format string.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

int ediUpdateRec (Edi *edi, EdiRec *rec)

Write a record to the database.

Description:: If the record is a new record and the "id" column is EDI_AUTO_INC, then the "id" will be assigned prior to saving the record.

Parameters:

edi	Database handle.
rec	Record to write to the database.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

bool ediValidateRec (EdiRec *rec)

Validate a record.

Description:: Run defined field validations and return true if the record validates. Field validations are defined via ediAddValidation calls. If any validations fail, error messages will be added to the record and can be retrieved via ediGetRecErrors

Parameters:

rec	Record to validate.

Returns:: True if all field valiations pass.

API Stability:: Stable.

int edRemoveColumn (Edi *edi, cchar *tableName, cchar *columnName)

Remove a column from a table.

Parameters:

edi	Database handle.
tableName	Database table name.
columnName	Database column name.

Returns:: Zero if successful. Otherwise a negative MPR error code.

API Stability:: Stable.

EdiField

EDI Record field structure.

Description:: The EdiField stores record field data and minimal schema information such as the data type and source column name.

Fields:

int	flags	Field flags. Flag mask set to EDI_AUTO_INC, EDI_KEY and/or EDI_INDEX.
cchar *	name	Field name. Sourced from the database column name.
int	type	Field data type. Set to one of EDI_TYPE_BINARY, EDI_TYPE_BOOL, EDI_TYPE_DATE EDI_TYPE_FLOAT, EDI_TYPE_INT, EDI_TYPE_STRING, EDI_TYPE_TEXT
int	valid	Field validity. Set to true if valid.
cchar *	value	Field data value.

EdiGrid

Grid structure.

Description:: A grid is a tabular (grid) of rows and records. Grids may capture database table data, or may be free-standing without a backing database.

Fields:

int	count	Total count of available records matching query.
struct Edi *	edi	Database handle.
int	flags	Grid flags.
int	nrecords	Number of records in grid.
EdiRec *	records[ARRAY_FLEX]	Grid records.
cchar *	tableName	Base table name for grid.

EdiGrid * * ediFilterGridFields (EdiGrid *grid, cchar *fields, int include)

Filter the fields of a grid.

Parameters:

grid	Grid to modify and filter.
fields	Space separated list of record field names.
include	Set to true to interpret the names as fields to include. If false, interpret the names as fields to reject.

Returns:: The filtered grid. Same reference as the input grid.

API Stability:: Internal.

cchar * * ediGetGridSchemaAsJson (EdiGrid *grid)

Get the schema for a grid and format as JSON.

Parameters:

grid	Grid to examine.

API Stability:: Stable.

EdiRec * * ediGetNextRec (EdiGrid *grid, EdiRec *rec)

Get the next record in a grid This is used as an iterator.

For the first call, set rec to NULL

Parameters:

grid	Grid whose records are iterated.
rec	Record pointer.

Returns:: The next record object. Returns NULL after the last record.

API Stability:: Stable.

EdiGrid * * ediPivotGrid (EdiGrid *grid, int flags)

Pivot a grid swapping rows for columns.

Parameters:

grid	Source grid.
flags	Control flags. Set to EDI_PIVOT_FIELD_NAMES to use field names as the first column of data.

Returns:: New pivoted grid.

API Stability:: Stable.

EdiRec

Database record structure.

Description:: Records may capture database row data, or may be free-standing without a backing database.

Fields:

struct Edi *	edi	Database handle.
MprHash *	errors	Hash of record errors.
EdiField	fields[ARRAY_FLEX]	Field records.
cchar *	id	Record key ID.
int	index	Grid index for iteration.
int	nfields	Number of fields in record.
cchar *	tableName	Base table name for record.

EdiRec * * ediFilterRecFields (EdiRec *rec, cchar *fields, int include)

Filter the fields of a record.

Parameters:

rec	Record to modify and filter.
fields	Space separated list of record field names.
include	Set to true to interpret the names as fields to include. If false, interpret the names as fields to reject.

Returns:: The filtered record. Same reference as the input record.

API Stability:: Internal.

EdiField * * ediGetNextField (EdiRec *rec, EdiField *fp, int offset)

Get the next field in a record This is used as an iterator.

For the first call, set fp to NULL

Parameters:

rec	Record whose fields are iterated.
fp	Field pointer.
offset	Initial offset. Set to 1 to step over the ID field.

Returns:: The next field object. Returns NULL after the last field.

API Stability:: Stable.

cchar * * ediGetRecSchemaAsJson (EdiRec *rec)

Get the schema for a record and format as JSON.

Parameters:

rec

API Stability:: Stable.

EdiService

Edi service control structure.

Fields:

void ediAddFieldError (struct EdiRec *rec, cchar *field, cchar *fmt, ...)

Add a field error message.

Parameters:

rec	Record to update.
field	Field name for the error message.
fmt	Message format string.

API Stability:: Stable.

void ediAddProvider (struct EdiProvider *provider)

Add a database provider.

Description:: This should only be called by database providers.

API Stability:: Stable.

EdiService * * ediCreateService (void )

Create the EDI service.

Returns:: EdiService object.

API Stability:: Stable.

void ediDefineMigration (struct Edi *edi, EdiMigration forw, EdiMigration back)

Define database migration callbacks.

Parameters:

edi	Database handle.
forw	Forward migration callback. Of the form: int forw(Edi *edit); A successful return should be zero.
back	Backward migration callback. Of the form: int back(Edi *edit); A successful return should be zero.

API Stability:: Stable.

void ediDefineValidation (cchar *name, EdiValidationProc vfn)

Define a field validation procedure.

Parameters:

name	Validation name.
vfn	Validation callback to invoke when validating field data.

API Stability:: Stable.

Functions

Typedefs

typedef cchar *(* EdiValidationProc) (struct EdiValidation *vp, struct EdiRec *rec, cchar *fieldName, cchar *value).

Field validation callback procedure.

Parameters:

vp	Validation structure reference.
rec	Record to validate.
fieldName	Field name to validate.
value	Field value to.

API Stability:: Stable.

EdiProvider

Database provider interface.

Fields:

EdiValidation

Validation structure.

API Stability:: Stable.

Fields:

cvoid *	data	Custom data (managed).
cvoid *	mdata	Custom data (unmanaged).
cchar *	name	Validation name.
EdiValidationProc	vfn	Validation callback procedure.