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18 package org.apache.shardingsphere.infra.database.h2.metadata.data.loader;
19
20 import org.apache.shardingsphere.infra.database.core.metadata.data.loader.DialectMetaDataLoader;
21 import org.apache.shardingsphere.infra.database.core.metadata.data.loader.MetaDataLoaderMaterial;
22 import org.apache.shardingsphere.infra.database.core.metadata.data.model.ColumnMetaData;
23 import org.apache.shardingsphere.infra.database.core.metadata.data.model.IndexMetaData;
24 import org.apache.shardingsphere.infra.database.core.metadata.data.model.SchemaMetaData;
25 import org.apache.shardingsphere.infra.database.core.metadata.data.model.TableMetaData;
26 import org.apache.shardingsphere.infra.database.core.metadata.database.datatype.DataTypeRegistry;
27
28 import java.sql.Connection;
29 import java.sql.PreparedStatement;
30 import java.sql.ResultSet;
31 import java.sql.SQLException;
32 import java.sql.Types;
33 import java.util.Collection;
34 import java.util.Collections;
35 import java.util.HashMap;
36 import java.util.LinkedList;
37 import java.util.Map;
38 import java.util.Map.Entry;
39 import java.util.stream.Collectors;
40
41
42
43
44 public final class H2MetaDataLoader implements DialectMetaDataLoader {
45
46 private static final String TABLE_META_DATA_NO_ORDER = "SELECT TABLE_CATALOG, TABLE_NAME, COLUMN_NAME, DATA_TYPE, ORDINAL_POSITION, COALESCE(IS_VISIBLE, FALSE) IS_VISIBLE, IS_NULLABLE"
47 + " FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_CATALOG=? AND TABLE_SCHEMA=?";
48
49 private static final String ORDER_BY_ORDINAL_POSITION = " ORDER BY ORDINAL_POSITION";
50
51 private static final String TABLE_META_DATA_SQL = TABLE_META_DATA_NO_ORDER + ORDER_BY_ORDINAL_POSITION;
52
53 private static final String TABLE_META_DATA_SQL_IN_TABLES = TABLE_META_DATA_NO_ORDER + " AND UPPER(TABLE_NAME) IN (%s)" + ORDER_BY_ORDINAL_POSITION;
54
55 private static final String INDEX_META_DATA_SQL = "SELECT TABLE_CATALOG, TABLE_NAME, INDEX_NAME, INDEX_TYPE_NAME FROM INFORMATION_SCHEMA.INDEXES"
56 + " WHERE TABLE_CATALOG=? AND TABLE_SCHEMA=? AND UPPER(TABLE_NAME) IN (%s)";
57
58 private static final String PRIMARY_KEY_META_DATA_SQL = "SELECT TABLE_NAME, INDEX_NAME FROM INFORMATION_SCHEMA.INDEXES WHERE TABLE_CATALOG=? AND TABLE_SCHEMA=?"
59 + " AND INDEX_TYPE_NAME = 'PRIMARY KEY'";
60
61 private static final String PRIMARY_KEY_META_DATA_SQL_IN_TABLES = PRIMARY_KEY_META_DATA_SQL + " AND UPPER(TABLE_NAME) IN (%s)";
62
63 private static final String GENERATED_INFO_SQL = "SELECT C.TABLE_NAME TABLE_NAME, C.COLUMN_NAME COLUMN_NAME, COALESCE(I.IS_GENERATED, FALSE) IS_GENERATED FROM INFORMATION_SCHEMA.COLUMNS C"
64 + " RIGHT JOIN INFORMATION_SCHEMA.INDEXES I ON C.TABLE_NAME=I.TABLE_NAME WHERE C.TABLE_CATALOG=? AND C.TABLE_SCHEMA=?";
65
66 private static final String GENERATED_INFO_SQL_IN_TABLES = GENERATED_INFO_SQL + " AND UPPER(C.TABLE_NAME) IN (%s)";
67
68 @Override
69 public Collection<SchemaMetaData> load(final MetaDataLoaderMaterial material) throws SQLException {
70 Collection<TableMetaData> tableMetaDataList = new LinkedList<>();
71 try (Connection connection = material.getDataSource().getConnection()) {
72 Map<String, Collection<ColumnMetaData>> columnMetaDataMap = loadColumnMetaDataMap(connection, material.getActualTableNames());
73 Map<String, Collection<IndexMetaData>> indexMetaDataMap = columnMetaDataMap.isEmpty() ? Collections.emptyMap() : loadIndexMetaData(connection, columnMetaDataMap.keySet());
74 for (Entry<String, Collection<ColumnMetaData>> entry : columnMetaDataMap.entrySet()) {
75 Collection<IndexMetaData> indexMetaDataList = indexMetaDataMap.getOrDefault(entry.getKey(), Collections.emptyList());
76 tableMetaDataList.add(new TableMetaData(entry.getKey(), entry.getValue(), indexMetaDataList, Collections.emptyList()));
77 }
78 }
79 return Collections.singleton(new SchemaMetaData(material.getDefaultSchemaName(), tableMetaDataList));
80 }
81
82 private Map<String, Collection<ColumnMetaData>> loadColumnMetaDataMap(final Connection connection, final Collection<String> tables) throws SQLException {
83 Map<String, Collection<ColumnMetaData>> result = new HashMap<>();
84 try (PreparedStatement preparedStatement = connection.prepareStatement(getTableMetaDataSQL(tables))) {
85 Map<String, Collection<String>> tablePrimaryKeys = loadTablePrimaryKeys(connection, tables);
86 Map<String, Map<String, Boolean>> tableGenerated = loadTableGenerated(connection, tables);
87 preparedStatement.setString(1, connection.getCatalog());
88 preparedStatement.setString(2, "PUBLIC");
89 try (ResultSet resultSet = preparedStatement.executeQuery()) {
90 while (resultSet.next()) {
91 String tableName = resultSet.getString("TABLE_NAME");
92 ColumnMetaData columnMetaData =
93 loadColumnMetaData(resultSet, tablePrimaryKeys.getOrDefault(tableName, Collections.emptyList()), tableGenerated.getOrDefault(tableName, new HashMap<>()));
94 if (!result.containsKey(tableName)) {
95 result.put(tableName, new LinkedList<>());
96 }
97 result.get(tableName).add(columnMetaData);
98 }
99 }
100 }
101 return result;
102 }
103
104 private ColumnMetaData loadColumnMetaData(final ResultSet resultSet, final Collection<String> primaryKeys, final Map<String, Boolean> tableGenerated) throws SQLException {
105 String columnName = resultSet.getString("COLUMN_NAME");
106 String dataType = resultSet.getString("DATA_TYPE");
107 boolean primaryKey = primaryKeys.contains(columnName);
108 boolean generated = tableGenerated.getOrDefault(columnName, Boolean.FALSE);
109 boolean isVisible = resultSet.getBoolean("IS_VISIBLE");
110 boolean isNullable = "YES".equals(resultSet.getString("IS_NULLABLE"));
111 return new ColumnMetaData(columnName, DataTypeRegistry.getDataType(getDatabaseType(), dataType).orElse(Types.OTHER), primaryKey, generated, false, isVisible, false, isNullable);
112 }
113
114 private String getTableMetaDataSQL(final Collection<String> tables) {
115 return tables.isEmpty() ? TABLE_META_DATA_SQL
116 : String.format(TABLE_META_DATA_SQL_IN_TABLES, tables.stream().map(each -> String.format("'%s'", each).toUpperCase()).collect(Collectors.joining(",")));
117 }
118
119 private Map<String, Collection<IndexMetaData>> loadIndexMetaData(final Connection connection, final Collection<String> tableNames) throws SQLException {
120 Map<String, Collection<IndexMetaData>> result = new HashMap<>();
121 try (PreparedStatement preparedStatement = connection.prepareStatement(getIndexMetaDataSQL(tableNames))) {
122 preparedStatement.setString(1, connection.getCatalog());
123 preparedStatement.setString(2, "PUBLIC");
124 try (ResultSet resultSet = preparedStatement.executeQuery()) {
125 while (resultSet.next()) {
126 String indexName = resultSet.getString("INDEX_NAME");
127 String tableName = resultSet.getString("TABLE_NAME");
128 boolean uniqueIndex = "UNIQUE INDEX".equals(resultSet.getString("INDEX_TYPE_NAME"));
129 if (!result.containsKey(tableName)) {
130 result.put(tableName, new LinkedList<>());
131 }
132 IndexMetaData indexMetaData = new IndexMetaData(indexName);
133 indexMetaData.setUnique(uniqueIndex);
134 result.get(tableName).add(indexMetaData);
135
136 }
137 }
138 }
139 return result;
140 }
141
142 private String getIndexMetaDataSQL(final Collection<String> tableNames) {
143 return String.format(INDEX_META_DATA_SQL, tableNames.stream().map(each -> String.format("'%s'", each).toUpperCase()).collect(Collectors.joining(",")));
144 }
145
146 private String getPrimaryKeyMetaDataSQL(final Collection<String> tables) {
147 return tables.isEmpty() ? PRIMARY_KEY_META_DATA_SQL
148 : String.format(PRIMARY_KEY_META_DATA_SQL_IN_TABLES, tables.stream().map(each -> String.format("'%s'", each).toUpperCase()).collect(Collectors.joining(",")));
149 }
150
151 private Map<String, Collection<String>> loadTablePrimaryKeys(final Connection connection, final Collection<String> tableNames) throws SQLException {
152 Map<String, Collection<String>> result = new HashMap<>();
153 try (PreparedStatement preparedStatement = connection.prepareStatement(getPrimaryKeyMetaDataSQL(tableNames))) {
154 preparedStatement.setString(1, connection.getCatalog());
155 preparedStatement.setString(2, "PUBLIC");
156 try (ResultSet resultSet = preparedStatement.executeQuery()) {
157 while (resultSet.next()) {
158 String indexName = resultSet.getString("INDEX_NAME");
159 String tableName = resultSet.getString("TABLE_NAME");
160 result.computeIfAbsent(tableName, key -> new LinkedList<>()).add(indexName);
161 }
162 }
163 }
164 return result;
165 }
166
167 private String getGeneratedInfoSQL(final Collection<String> tables) {
168 return tables.isEmpty() ? GENERATED_INFO_SQL
169 : String.format(GENERATED_INFO_SQL_IN_TABLES, tables.stream().map(each -> String.format("'%s'", each).toUpperCase()).collect(Collectors.joining(",")));
170 }
171
172 private Map<String, Map<String, Boolean>> loadTableGenerated(final Connection connection, final Collection<String> tableNames) throws SQLException {
173 Map<String, Map<String, Boolean>> result = new HashMap<>();
174 try (PreparedStatement preparedStatement = connection.prepareStatement(getGeneratedInfoSQL(tableNames))) {
175 preparedStatement.setString(1, connection.getCatalog());
176 preparedStatement.setString(2, "PUBLIC");
177 try (ResultSet resultSet = preparedStatement.executeQuery()) {
178 while (resultSet.next()) {
179 String columnName = resultSet.getString("COLUMN_NAME");
180 String tableName = resultSet.getString("TABLE_NAME");
181 boolean generated = resultSet.getBoolean("IS_GENERATED");
182 result.computeIfAbsent(tableName, key -> new HashMap<>()).put(columnName, generated);
183 }
184 }
185 }
186 return result;
187 }
188
189 @Override
190 public String getDatabaseType() {
191 return "H2";
192 }
193 }