edbQuery.RODBC_MySQL: Send and retrieve a query in a SQLite database (referenced by...
In easyrodbcmysql: Simple Database Interface for MySQL
Description
Usage
Arguments
Value
Author(s)
See Also
Examples
Description
Send and retrieve a query in a SQLIte database (referenced by 'edb').
Usage
1
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5
Arguments
edb
An object of class 'edb', such as returned by edb.
statement
Single character string. SQL statement / SQL query to be passed
to link[RODBC]{sqlQuery}.
formatCol
If not NULL, a named list of functions to be applied to certain columns
after the data has been extracted from the database. The name of each list
item gives the column to process, and the value of each item gives the
function that must be applied. For instance
formatCol = list("DATE"=as.Date) will apply the function
as.Date to the column "DATE".
verbose
Single logical. If TRUE, information on what is done are output
on screen.
...
Additional parameters to be passed to link[RODBC]{sqlQuery}.
Value
The function returns the requested table.
Author(s)
Julien MOEYS <Julien.Moeys@mark.slu.se>
See Also
Examples
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library( "easyrodbcmysql" )
testMySQL <- FALSE # Set to TRUE to run some tests
# after modifying the edb() part below
# with your own database setting
### Windows only:
if( (Sys.info()[[ "sysname" ]] == "Windows") & testMySQL ){
### Describe the database (NB: this is not a connection)
myDb <- edb(
dbType = "RODBC_MySQL",
dbSourceName = "nameOfODBCSource", # or any name you like
dbName = "nameOfDatabase",
dbLogin = "yourUserName",
dbPwd = "yourPassword",
dbHost = "127.0.0.1",
dbPort = 3306
) #
### Register the data source in ODBC
edbDataSource( myDb, verbose = TRUE )
### Use the database:
## Read data in a table in the database
# Retrieve a table (data.frame style subsetting):
myDb[ "WRB_SOIL_GROUP" ]
# Same operation, but with edbRead()
edbRead( edb = myDb, tableName = "WRB_SOIL_GROUP" )
# Retrieve part of a table (with row constrains)
myDb[ "WRB_SOIL_GROUP", list("ABBREV" = c("AC","CR","PL")),
verbose = TRUE ]
# Same operation, but with edbQuery()
edbQuery( edb = myDb, statement =
"SELECT * FROM [WRB_SOIL_GROUP] WHERE [ABBREV] IN ('AC','CR','PL')" )
### Un-register the data source in ODBC (windows only)
edbDataSource( myDb, trash = TRUE )
} #
easyrodbcmysql documentation built on May 2, 2019, 5:51 p.m.
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Description Usage Arguments Value Author(s) See Also Examples
Description
Send and retrieve a query in a SQLIte database (referenced by 'edb').
Usage
1 2 3 4 5 |
Arguments
edb |
An object of class 'edb', such as returned by |
statement |
Single character string. SQL statement / SQL query to be passed to |
formatCol |
If not NULL, a named list of functions to be applied to certain columns after the data has been extracted from the database. The name of each list item gives the column to process, and the value of each item gives the function that must be applied. For instance formatCol = list("DATE"=as.Date) will apply the function as.Date to the column "DATE". |
verbose |
Single logical. If TRUE, information on what is done are output on screen. |
... |
Additional parameters to be passed to |
Value
The function returns the requested table.
Author(s)
Julien MOEYS <Julien.Moeys@mark.slu.se>
See Also
Examples
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | library( "easyrodbcmysql" )
testMySQL <- FALSE # Set to TRUE to run some tests
# after modifying the edb() part below
# with your own database setting
### Windows only:
if( (Sys.info()[[ "sysname" ]] == "Windows") & testMySQL ){
### Describe the database (NB: this is not a connection)
myDb <- edb(
dbType = "RODBC_MySQL",
dbSourceName = "nameOfODBCSource", # or any name you like
dbName = "nameOfDatabase",
dbLogin = "yourUserName",
dbPwd = "yourPassword",
dbHost = "127.0.0.1",
dbPort = 3306
) #
### Register the data source in ODBC
edbDataSource( myDb, verbose = TRUE )
### Use the database:
## Read data in a table in the database
# Retrieve a table (data.frame style subsetting):
myDb[ "WRB_SOIL_GROUP" ]
# Same operation, but with edbRead()
edbRead( edb = myDb, tableName = "WRB_SOIL_GROUP" )
# Retrieve part of a table (with row constrains)
myDb[ "WRB_SOIL_GROUP", list("ABBREV" = c("AC","CR","PL")),
verbose = TRUE ]
# Same operation, but with edbQuery()
edbQuery( edb = myDb, statement =
"SELECT * FROM [WRB_SOIL_GROUP] WHERE [ABBREV] IN ('AC','CR','PL')" )
### Un-register the data source in ODBC (windows only)
edbDataSource( myDb, trash = TRUE )
} #
|
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