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JAVA-9556 added try-with-resources for resultset

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keerthigadde 2022-05-26 15:38:47 +10:00
parent 33258722ca
commit 863356b4bc
1 changed files with 49 additions and 47 deletions
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96
persistence-modules/core-java-persistence/src/main/java/com/baeldung/jdbcmetadata/MetadataExtractor.java
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@ -14,65 +14,66 @@ public class MetadataExtractor {
} }
public void extractTableInfo() throws SQLException { public void extractTableInfo() throws SQLException {
ResultSet resultSet = databaseMetaData.getTables(null, null, "CUST%", new String[] { "TABLE" }); try (ResultSet resultSet = databaseMetaData.getTables(null, null, "CUST%", new String[] { "TABLE" })) {
while (resultSet.next()) { while (resultSet.next()) {
// Print the names of existing tables // Print the names of existing tables
System.out.println(resultSet.getString("TABLE_NAME")); System.out.println(resultSet.getString("TABLE_NAME"));
System.out.println(resultSet.getString("REMARKS")); System.out.println(resultSet.getString("REMARKS"));
}
} }
} }
public void extractSystemTables() throws SQLException { public void extractSystemTables() throws SQLException {
ResultSet resultSet = databaseMetaData.getTables(null, null, null, new String[] { "SYSTEM TABLE" }); try (ResultSet resultSet = databaseMetaData.getTables(null, null, null, new String[] { "SYSTEM TABLE" })) {
while (resultSet.next()) { while (resultSet.next()) {
// Print the names of system tables // Print the names of system tables
System.out.println(resultSet.getString("TABLE_NAME")); System.out.println(resultSet.getString("TABLE_NAME"));
}
} }
} }
public void extractViews() throws SQLException { public void extractViews() throws SQLException {
ResultSet resultSet = databaseMetaData.getTables(null, null, null, new String[] { "VIEW" }); try(ResultSet resultSet = databaseMetaData.getTables(null, null, null, new String[] { "VIEW" })) {
while (resultSet.next()) { while (resultSet.next()) {
// Print the names of existing views // Print the names of existing views
System.out.println(resultSet.getString("TABLE_NAME")); System.out.println(resultSet.getString("TABLE_NAME"));
} }
}
} }
public void extractColumnInfo(String tableName) throws SQLException { public void extractColumnInfo(String tableName) throws SQLException {
ResultSet columns = databaseMetaData.getColumns(null, null, tableName, null); try(ResultSet columns = databaseMetaData.getColumns(null, null, tableName, null)) {
while (columns.next()) {
while (columns.next()) { String columnName = columns.getString("COLUMN_NAME");
String columnName = columns.getString("COLUMN_NAME"); String columnSize = columns.getString("COLUMN_SIZE");
String columnSize = columns.getString("COLUMN_SIZE"); String datatype = columns.getString("DATA_TYPE");
String datatype = columns.getString("DATA_TYPE"); String isNullable = columns.getString("IS_NULLABLE");
String isNullable = columns.getString("IS_NULLABLE"); String isAutoIncrement = columns.getString("IS_AUTOINCREMENT");
String isAutoIncrement = columns.getString("IS_AUTOINCREMENT"); System.out.println(String.format("ColumnName: %s, columnSize: %s, datatype: %s, isColumnNullable: %s, isAutoIncrementEnabled: %s", columnName, columnSize, datatype, isNullable, isAutoIncrement));
System.out.println(String.format("ColumnName: %s, columnSize: %s, datatype: %s, isColumnNullable: %s, isAutoIncrementEnabled: %s", columnName, columnSize, datatype, isNullable, isAutoIncrement)); }
} }
} }
public void extractPrimaryKeys(String tableName) throws SQLException { public void extractPrimaryKeys(String tableName) throws SQLException {
ResultSet primaryKeys = databaseMetaData.getPrimaryKeys(null, null, tableName); try(ResultSet primaryKeys = databaseMetaData.getPrimaryKeys(null, null, tableName)) {
while (primaryKeys.next()) { while (primaryKeys.next()) {
String primaryKeyColumnName = primaryKeys.getString("COLUMN_NAME"); String primaryKeyColumnName = primaryKeys.getString("COLUMN_NAME");
String primaryKeyName = primaryKeys.getString("PK_NAME"); String primaryKeyName = primaryKeys.getString("PK_NAME");
System.out.println(String.format("columnName:%s, pkName:%s", primaryKeyColumnName, primaryKeyName)); System.out.println(String.format("columnName:%s, pkName:%s", primaryKeyColumnName, primaryKeyName));
} }
} }
public void fun() throws SQLException {
} }
public void extractForeignKeys(String tableName) throws SQLException { public void extractForeignKeys(String tableName) throws SQLException {
ResultSet foreignKeys = databaseMetaData.getImportedKeys(null, null, tableName); try(ResultSet foreignKeys = databaseMetaData.getImportedKeys(null, null, tableName)) {
while (foreignKeys.next()) { while (foreignKeys.next()) {
String pkTableName = foreignKeys.getString("PKTABLE_NAME"); String pkTableName = foreignKeys.getString("PKTABLE_NAME");
String fkTableName = foreignKeys.getString("FKTABLE_NAME"); String fkTableName = foreignKeys.getString("FKTABLE_NAME");
String pkColumnName = foreignKeys.getString("PKCOLUMN_NAME"); String pkColumnName = foreignKeys.getString("PKCOLUMN_NAME");
String fkColumnName = foreignKeys.getString("FKCOLUMN_NAME"); String fkColumnName = foreignKeys.getString("FKCOLUMN_NAME");
System.out.println(String.format("pkTableName:%s, fkTableName:%s, pkColumnName:%s, fkColumnName:%s", pkTableName, fkTableName, pkColumnName, fkColumnName)); System.out.println(String.format("pkTableName:%s, fkTableName:%s, pkColumnName:%s, fkColumnName:%s", pkTableName, fkTableName, pkColumnName, fkColumnName));
} }
}
} }
public void extractDatabaseInfo() throws SQLException { public void extractDatabaseInfo() throws SQLException {
@ -89,11 +90,12 @@ public class MetadataExtractor {
public void extractUserName() throws SQLException { public void extractUserName() throws SQLException {
String userName = databaseMetaData.getUserName(); String userName = databaseMetaData.getUserName();
System.out.println(userName); System.out.println(userName);
ResultSet schemas = databaseMetaData.getSchemas(); try(ResultSet schemas = databaseMetaData.getSchemas()) {
while (schemas.next()) { while (schemas.next()) {
String table_schem = schemas.getString("TABLE_SCHEM"); String table_schem = schemas.getString("TABLE_SCHEM");
String table_catalog = schemas.getString("TABLE_CATALOG"); String table_catalog = schemas.getString("TABLE_CATALOG");
System.out.println(String.format("Table_schema:%s, Table_catalog:%s", table_schem, table_catalog)); System.out.println(String.format("Table_schema:%s, Table_catalog:%s", table_schem, table_catalog));
}
} }
} }