70 lines
1.7 KiB
Plaintext
70 lines
1.7 KiB
Plaintext
= SQL AST
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Ultimately our goal here is to have a `JdbcOperation` object to be executed. Generally, that would look like this:
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[source]
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----
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final SelectStatement sqlAst = ...;
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final JdbcServices jdbcServices = sessionFactory.getJdbcServices();
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final JdbcEnvironment jdbcEnvironment = jdbcServices.getJdbcEnvironment();
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final SqlAstTranslatorFactory sqlAstTranslatorFactory = jdbcEnvironment.getSqlAstTranslatorFactory();
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final JdbcSelect jdbcSelect = sqlAstTranslatorFactory.buildSelectTranslator( sessionFactory ).translate( sqlAst );
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final JdbcParameterBindings jdbcParameterBindings = new JdbcParameterBindingsImpl( jdbcParameters.size() );
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// <fill in parameter bindings>
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session.getFactory().getJdbcServices().getJdbcSelectExecutor().list(
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jdbcSelect,
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jdbcParameterBindings,
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...
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);
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----
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== The Tree
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The actual tree nodes are defined in the `org.hibernate.sql.ast.tree` package.
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== Building SQL AST
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There are 2 main producers of SQL AST atm:
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* SQM translation - see `org.hibernate.query.sqm.sql`
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* metamodel-based loading - see `org.hibernate.loader.internal.MetamodelSelectBuilderProcess`
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== Translating SQL AST
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Translating a SQL AST produces 2 pieces of information needed for executing SQL:
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* `org.hibernate.sql.exec.spi.JdbcOperation`
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* `org.hibernate.sql.exec.spi.JdbcParameterBindings`
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=== JdbcOperation
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* `org.hibernate.sql.exec.spi.JdbcDelete`
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* `org.hibernate.sql.exec.spi.JdbcInsert`
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* `org.hibernate.sql.exec.spi.JdbcSelect`
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* `org.hibernate.sql.exec.spi.JdbcUpdate`
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=== JdbcParameterBindings
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== Execution
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=== SELECT execution
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`org.hibernate.sql.exec.spi.JdbcSelectExecutor`
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=== INSERT, UPDATE, DELETE execution
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`org.hibernate.sql.exec.spi.JdbcMutationExecutor`
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