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: The Table element FAQ.
A class to match the fields in the table that are not in the primary key, and non BLOB fields. This class will extend the primary key if there is one. A class to hold any BLOB fields in the table, if there are any. This class will extend one of the two previous classes depending on the configuration of the table.
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You can specify unlimited table elements. In this case, MBG will automatically delimit the table identifiers in the generated SQL. Else if the database reports that identifiers are stored in upper case, MBG will automatically convert any table identifier to upper case. Else if the database reports that identifiers are stored in lower case, MBG will automatically convert any table identifier to lower case.
Else MBG will look for tables based on the exact case specified. In most cases, this process works perfectly. However, there are cases where it will fail. Because the table name is delimited, most databases will create the table with the exact case specified – even if the database normally stores identifiers in upper case. The specified value can contain SQL wildcards if so desired. The database schema – not required if your database does not use schemas, or if there is a default schema. The database catalog – not required if your database does not use catalogs, or if there is a default catalog.
If specified, this value will be used to alias the table and all column names in any generated SQL select statement. The base name from which generated object names will be generated. You can specify a package fragment in the domain object name. For example, if you specify foo. If not specified, the name will be whatever the domain object name is, plus the word “Mapper”.
You can specify a package fragment in the mapper name. You can specify a package fragment in the SQL provider name. Signifies whether an insert statement should be generated. Signifies whether a select by primary key statement should be generated. Regardless of this setting, the statement will not be generated if the table does not have a primary key.
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Signifies whether a select by example statement should be generated. This statement enables many different dynamic queries to be generated at run time. Signifies whether an update by primary key statement should be generated. Signifies whether an delete by primary key statement should be generated.
Signifies whether a delete by example statement should be generated. This statement enables many different dynamic deletes to be generated at run time. Signifies whether a count by example statement should be generated. This statement will return the number of rows in a table that match an example. Signifies whether an update by example statement should be generated.
This statement will update rows in a table that match an example. If true, an update by example “selective” statement will also be generated. The “selective” statement will only update columns where the corresponding value in the record parameter is non-null. This value will be added to the select list of the select by primary key statement in this form: “” as QUERYID”. This can be useful for identifying queries in DBA tracing tools at run time.
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If you use thus value, you should specify a unique id for every different query generated by MBG. This value will be added to the select list of the select by example statement in this form: “” as QUERYID”. This property is used to override the default model type if you desire to do so for this table. If not specified, MBG will generate domain objects based on the context default model type. The model type defines how MBG will generate domain classes.
With some model types MBG will generate a single domain class for each table, with others MBG may generate different classes depending on the structure of the table. This model generates only one domain class for any table. The class will hold all fields in the table. This model will generate a primary key class if the table has a primary key, another class that holds any BLOB columns in the table, and another class that holds the remaining fields.
There is an appropriate inheritance relationship between the classes. Name should be escaped when searching for columns. Signifies whether MBG should use the exact case specified when searching for tables and then delimit the identifiers in the generated SQL. See the discussion above for more details. Signifies whether MBG should add delimiters to all column names in the generated SQL. This is useful for databases like PostgreSQL that are case sensitive with identifiers. Also, the SQL result map will be built to use the constructor rather than the “setter” for each field.
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If true, then MBG will not add the schema or catalog to the table name in the generated SQL. This is useful if you have tables with the same name in several schemas – you can use MBG to generate objects based on the table in one schema, but not include the schema for runtime. This property is used to select whether MBG will generate immutable model classes – this means that the classes will not have “setter” methods and the constructor will accept values for each field in the class. This property is used to select whether MBG will only generate model classes for a table. If true, then a Java client will not be generated. This property can be used to specify a root class for all generated Java model objects. MBG will specify this value as the super class of the primary key object, if the table has a primary key, or the record object otherwise.
This property can be used to specify a super interface for all generated DAO interface objects. Important: MBG does not verify that the interface exists, or is a valid Java interface. If you specify a value for this property, than MBG will use that value as the catalog in the generated SQL rather than the catalog as configured above. This is useful if you want to generate code against one catalog, but want to use a different catalog at runtime. If you specify a value for this property, than MBG will use that value as the schema in the generated SQL rather than the schema as configured above.
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This is useful if you want to generate code against one schema, but want to use a different schema at runtime. This is especially useful on Oracle if you want to generate objects to use a public synonym. In that case, you will need to generate the objects against the actual table that the synonym points to, then specify the synonym name in this property. This can be useful if your database stores data in CHAR fields rather than VARCHAR fields.
The default value is inherited from the , otherwise false. If true, then MBG will use column names as returned from the database metadata as the properties of the generated domain objects. MBG will attempt to camel case the returned names. For example, suppose a table contains a column START_DATE. There is a slight performance benefit with this support also. If true, then MBG will use generate property names by contatenating the column name with the column reparks. Example This element specifies that we always want to generate code for a table called MYTABLE in schema MYSCHEMA.
Some elements exist in several different structural forms, called allotropes. Each allotrope has different physical properties. For more information on the Visual Elements image see the Uses and properties section below. The name is derived from the Latin ‘radius’, meaning ray. A vertical column in the periodic table. Members of a group typically have similar properties and electron configurations in their outer shell. A horizontal row in the periodic table.
The atomic number of each element increases by one, reading from left to right. Elements are organised into blocks by the orbital type in which the outer electrons are found. The number of protons in an atom. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase.
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Density is the mass of a substance that would fill 1 cm3 at room temperature. The mass of an atom relative to that of carbon-12. This is approximately the sum of the number of protons and neutrons in the nucleus. Where more than one isotope exists, the value given is the abundance weighted average.
Atoms of the same element with different numbers of neutrons. The Chemical Abstracts Service registry number is a unique identifier of a particular chemical, designed to prevent confusion arising from different languages and naming systems. Murray Robertson is the artist behind the images which make up Visual Elements. This is where the artist explains his interpretation of the element and the science behind the picture. The description of the element in its natural form. The role of the element in humans, animals and plants.
Where the element is most commonly found in nature, and how it is sourced commercially. The image represents the former use of radium in luminous paint used for clock and watch dials. A soft, shiny and silvery radioactive metal. Radium now has few uses, because it is so highly radioactive.
Radium-223 is sometimes used to treat prostate cancer that has spread to the bones. Because bones contain calcium and radium is in the same group as calcium, it can be used to target cancerous bone cells. It gives off alpha particles that can kill the cancerous cells. Radium used to be used in luminous paints, for example in clock and watch dials. Although the alpha rays could not pass through the glass or metal of the watch casing, it is now considered to be too hazardous to be used in this way. Radium has no known biological role. It is toxic due to its radioactivity.
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Radium is present in all uranium ores, and could be extracted as a by-product of uranium refining. Uranium ores from DR Congo and Canada are richest in radium. Today radium is extracted from spent fuel rods from nuclear reactors. Annual production of this element is fewer than 100 grams per year. Radium was discovered in 1898 by Marie Curie and Pierre Curie. They identified that it was a new element because its atomic spectrum revealed new lines. The metal itself was isolated by Marie Curie and André Debierne in 1911, by means of the electrolysis of radium chloride.
At Debierne’s suggestion, they used a mercury cathode in which the liberated radium dissolved. This was then heated to distil off the mercury leaving the radium behind. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. These values were determined using several different methods. Half of the distance between two atoms within a single covalent bond. Values are given for typical oxidation number and coordination. The energy released when an electron is added to the neutral atom and a negative ion is formed.
The tendency of an atom to attract electrons towards itself, expressed on a relative scale. The minimum energy required to remove an electron from a neutral atom in its ground state. The oxidation state of an atom is a measure of the degree of oxidation of an atom. It is defined as being the charge that an atom would have if all bonds were ionic. Uncombined elements have an oxidation state of 0. The sum of the oxidation states within a compound or ion must equal the overall charge.
This is calculated by combining the scores for crustal abundance, reserve distribution, production concentration, substitutability, recycling rate and political stability scores. The number of atoms of the element per 1 million atoms of the Earth’s crust. The percentage of a commodity which is recycled. A higher recycling rate may reduce risk to supply. The availability of suitable substitutes for a given commodity. The percentage of an element produced in the top producing country. The higher the value, the larger risk there is to supply.
The percentage of the world reserves located in the country with the largest reserves. A percentile rank for the political stability of the top producing country, derived from World Bank governance indicators. A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators. Specific heat capacity is the amount of energy needed to change the temperature of a kilogram of a substance by 1 K. A measure of the stiffness of a substance.
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It provides a measure of how difficult it is to extend a material, with a value given by the ratio of tensile strength to tensile strain. A measure of how difficult it is to deform a material. It is given by the ratio of the shear stress to the shear strain. A measure of how difficult it is to compress a substance. It is given by the ratio of the pressure on a body to the fractional decrease in volume. A measure of the propensity of a substance to evaporate.
It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system. You’re listening to Chemistry in its element brought to you by Chemistry World, the magazine of the Royal Society of Chemistry. Hello, this week the self illuminating story of element number 88. There’s something about Radium that is deliciously Victorian. It’s not just that this radioactive element was discovered at the end of the Victorian era in 1898.
There’s also something about its early use as a universal restorative that has a peculiarly period feel. It was seen as a source of energy and brightness, it was included in toothpastes and quack potions – it was even rubbed into the scalp as a hair restorer. But the application of radium that would bring it notoriety was its use in glow-in-the-dark paint. Frequently used to provide luminous readouts on clocks and watches, aircraft switches and instrument dials, the eerie blue glow of radium was seen as a harmless, practical source of night time illumination. A more famous victim of radium was its discoverer, the double Nobel prize winner Marie Curie, born Maria Sklodowska. Working with her husband Pierre, Marie Curie was studying pitchblende, a mineral from North Bohemia that contained uranium.
Pitchblende was mined near what’s now Jachymov in the Czech Republic, and after the uranium had been extracted to be used to colour pottery glazes and tint photographs, the residual slag was dumped in a nearby forest. Marie Curie wrote to sister Bronia that ‘The radiation that I couldn’t explain comes from a new chemical element. The element is there and I’ve got to find it! After working through tonnes of the pitchblende slag, the Curies identified two new elements in the remaining material – polonium and radium.
They finally isolated radium in 1902 in its pure metal form. Radium was named for the Latin for a ray and proved to be the most radioactive natural substance ever discovered. Although Marie Curie lived until 1934, her death from aplastic anaemia is almost certainly due to her exposure to radioactive materials, particularly radium. To this day her notebooks and papers have to be kept in lead lined boxes and handled with protective clothing, as they remain radioactive. Radium occurs naturally as uranium decays – though only in very small quantities. It took many tonnes of pitchblende to produce the tenth of a gram of radium that the Curies eventually extracted.
It’s classified in the periodic table as an alkaline earth metal – the heaviest of the series – putting it alongside more familiar metals like magnesium and calcium. A later starring role for radium would be as the source of alpha particles – helium nuclei – used by Rutherford in 1909 at the Cavendish laboratory in Cambridge to fire at a thin gold foil. Radium decays to radon, throwing out an alpha particle from its nucleus. Radium’s main practical use has been in medicine, producing radon gas from radium chloride to be used in radiotherapy for cancer. This was a process started in Marie Curie’s time.