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| 1 | +package sample.context.orm; |
| 2 | + |
| 3 | +import java.util.List; |
| 4 | +import java.util.Map; |
| 5 | + |
| 6 | +import org.springframework.data.domain.PageImpl; |
| 7 | +import org.springframework.data.domain.PageRequest; |
| 8 | +import org.springframework.data.jdbc.core.convert.EntityRowMapper; |
| 9 | +import org.springframework.data.jdbc.core.convert.JdbcConverter; |
| 10 | +import org.springframework.data.relational.core.mapping.RelationalMappingContext; |
| 11 | +import org.springframework.data.relational.core.mapping.RelationalPersistentEntity; |
| 12 | +import org.springframework.data.web.PagedModel; |
| 13 | +import org.springframework.jdbc.core.RowMapper; |
| 14 | +import org.springframework.jdbc.core.simple.JdbcClient; |
| 15 | +import org.springframework.stereotype.Component; |
| 16 | + |
| 17 | +import lombok.RequiredArgsConstructor; |
| 18 | + |
| 19 | +/** |
| 20 | + * Wrapper utility component that encapsulates JdbcClient. |
| 21 | + * <p> |
| 22 | + * For typical use cases, use find which does not depend on Spring Data. |
| 23 | + * For table-mapped entities, use findEntity. |
| 24 | + */ |
| 25 | +@Component |
| 26 | +@RequiredArgsConstructor(staticName = "of") |
| 27 | +public class JdbcFinder { |
| 28 | + private final JdbcClient jdbcClient; |
| 29 | + private final JdbcConverter jdbcConverter; |
| 30 | + private final RelationalMappingContext mappingContext; |
| 31 | + |
| 32 | + /** Gets the JdbcClient. */ |
| 33 | + public JdbcClient client() { |
| 34 | + return jdbcClient; |
| 35 | + } |
| 36 | + |
| 37 | + /** Performs a simple search. */ |
| 38 | + public <T> List<T> find(Class<T> type, SqlBuilder sqlBuilder) { |
| 39 | + return jdbcClient.sql(sqlBuilder.build()) |
| 40 | + .params(sqlBuilder.params()) |
| 41 | + .query(type) |
| 42 | + .list(); |
| 43 | + } |
| 44 | + |
| 45 | + /** Performs a simple search. */ |
| 46 | + public <T> List<T> find(Class<T> type, RowMapper<T> rowMapper, SqlBuilder sqlBuilder) { |
| 47 | + return jdbcClient.sql(sqlBuilder.build()) |
| 48 | + .params(sqlBuilder.params()) |
| 49 | + .query(rowMapper) |
| 50 | + .list(); |
| 51 | + } |
| 52 | + |
| 53 | + /** Performs a simple search. (Spring Data compatible) */ |
| 54 | + public <T> List<T> findEntity(Class<T> type, SqlBuilder sqlBuilder) { |
| 55 | + return jdbcClient.sql(sqlBuilder.build()) |
| 56 | + .params(sqlBuilder.params()) |
| 57 | + .query(createEntityRowMapper(type)) |
| 58 | + .list(); |
| 59 | + } |
| 60 | + |
| 61 | + @SuppressWarnings("unchecked") |
| 62 | + private <T> RowMapper<T> createEntityRowMapper(Class<T> type) { |
| 63 | + if (mappingContext == null || jdbcConverter == null) { |
| 64 | + throw new IllegalStateException( |
| 65 | + "JdbcFinder is not properly initialized for EntityRowMapper. (not found mappingContext or jdbcConverter)"); |
| 66 | + } |
| 67 | + RelationalPersistentEntity<T> entity = (RelationalPersistentEntity<T>) mappingContext |
| 68 | + .getRequiredPersistentEntity(type); |
| 69 | + return new EntityRowMapper<>(entity, jdbcConverter); |
| 70 | + } |
| 71 | + |
| 72 | + /** Performs a paged search. */ |
| 73 | + public <T> PagedModel<T> find(Class<T> type, SqlBuilder sqlBuilder, Integer page, Integer size) { |
| 74 | + var pageRequest = PageRequest.of(page != null ? page : 0, size != null ? size : 100); |
| 75 | + String countSql = sqlBuilder.buildCount(); |
| 76 | + String sql = sqlBuilder.build(pageRequest); |
| 77 | + Map<String, Object> params = sqlBuilder.params(); |
| 78 | + Long total = jdbcClient.sql(countSql) |
| 79 | + .params(params) |
| 80 | + .query(Long.class) |
| 81 | + .single(); |
| 82 | + List<T> list = jdbcClient.sql(sql) |
| 83 | + .params(params) |
| 84 | + .query(type) |
| 85 | + .list(); |
| 86 | + return new PagedModel<>(new PageImpl<>(list, pageRequest, total)); |
| 87 | + } |
| 88 | + |
| 89 | + /** Performs a paged search. */ |
| 90 | + public <T> PagedModel<T> find( |
| 91 | + Class<T> type, |
| 92 | + RowMapper<T> rowMapper, |
| 93 | + SqlBuilder sqlBuilder, |
| 94 | + Integer page, |
| 95 | + Integer size) { |
| 96 | + var pageRequest = PageRequest.of(page != null ? page : 0, size != null ? size : 100); |
| 97 | + String countSql = sqlBuilder.buildCount(); |
| 98 | + String sql = sqlBuilder.build(pageRequest); |
| 99 | + Map<String, Object> params = sqlBuilder.params(); |
| 100 | + Long total = jdbcClient.sql(countSql) |
| 101 | + .params(params) |
| 102 | + .query(Long.class) |
| 103 | + .single(); |
| 104 | + List<T> list = jdbcClient.sql(sql) |
| 105 | + .params(params) |
| 106 | + .query(rowMapper) |
| 107 | + .list(); |
| 108 | + return new PagedModel<>(new PageImpl<>(list, pageRequest, total)); |
| 109 | + } |
| 110 | + |
| 111 | + /** Performs a paged search. (Spring Data compatible) */ |
| 112 | + public <T> PagedModel<T> findEntity(Class<T> type, SqlBuilder sqlBuilder, Integer page, Integer size) { |
| 113 | + var pageRequest = PageRequest.of(page != null ? page : 0, size != null ? size : 100); |
| 114 | + String countSql = sqlBuilder.buildCount(); |
| 115 | + String sql = sqlBuilder.build(pageRequest); |
| 116 | + Map<String, Object> params = sqlBuilder.params(); |
| 117 | + Long total = jdbcClient.sql(countSql) |
| 118 | + .params(params) |
| 119 | + .query(Long.class) |
| 120 | + .single(); |
| 121 | + List<T> list = jdbcClient.sql(sql) |
| 122 | + .params(params) |
| 123 | + .query(createEntityRowMapper(type)) |
| 124 | + .list(); |
| 125 | + return new PagedModel<>(new PageImpl<>(list, pageRequest, total)); |
| 126 | + } |
| 127 | + |
| 128 | + public static JdbcFinder of(JdbcClient jdbcClient) { |
| 129 | + return new JdbcFinder(jdbcClient, null, null); |
| 130 | + } |
| 131 | + |
| 132 | +} |
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